NCC 2022 Volume Three - Plumbing Code of Australia
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B2

Part B2 Heated water services

Part B2 Heated water services

Introduction to this Part

This Part sets out the requirements for any part of a heated water service of a property that is connected to the drinking water supply. It covers from the point of connection to the points of discharge.

Objectives

The Objective of this Part is to—

  1. safeguard people from illness, injury or loss (including loss of amenity) due to the failure of a heated water installation; and
  2. ensure that a heated water installation is suitable; and
  3. conserve water; and
  4. safeguard the environment; and
  5. reduce greenhouse gas emissions; and
  6. safeguard public and private infrastructure; and
  7. ensure that a heated water installation is designed and is capable of being maintained so that throughout its serviceable life it will continue to satisfy Objectives (a) to (f).

Functional Statements

Sanitary fixtures, sanitary appliances and supply outlets provided with heated water must have a safe and adequate piped heated water supply.

The heated water supply must be conveyed through plumbing installations in a way that—

  1. minimises any adverse impact on building occupants, the Network Utility Operator’s infrastructure, property and the environment; and
  2. facilitates the conservation of water.

To reduce greenhouse gas emissions, to the degree necessary, a heated water service is to—

  1. be capable of efficiently using energy; and
  2. obtain its heating energy from—
    1. a low greenhouse gas intensity energy source; or
    2. an on-site renewable energy source; or
    3. another process as reclaimed energy.

Explanatory information

The greenhouse gas intensity of energy sources vary. For example, natural gas has a low greenhouse gas intensity compared with electricity generated from coal.

For the purposes of B2F3(b), the renewable energy source must be on-site (not GreenPower) and includes, but is not limited to solar, wind, hydroelectric, wave action and geothermal.

Performance Requirements

A heated water service must be connected to a drinking water supply.

Applications

B2P1 applies to a heated water service used for human consumption, food preparation, food utensil washing or personal hygiene.

Heated water supplied by a heated water service must be delivered from the point of discharge of fixtures and appliances at a temperature which is unlikely to scald.

Applications

B2P2 applies to fixtures and appliances used primarily for personal hygiene.

The water velocity in heated water service pipework up to 65 °C must not exceed—

  1. 3.0 m/s for more than 1% of the time that water is required during the peak hour in reticulated heated water systems; and
  2. 1.2 m/s for the flow and 1.0 m/s for the return of a copper circulatory heated water service for more than 1% of the time that water is required during the peak hour; and
  3. 1.0 m/s for the flow and return of a circulatory heated water service using other materials for more than 1% of the time that the water is required during the peak hour.

VIC B2P3 Velocity2019: BP2.3

Delete subclause B2P3(1) and insert B2P3(1) as follows:

The water velocity in heated water service pipework up to 65 °C must not exceed—

  1. 3 m/s for more than 1% of the time that water is required during the peak hour in non-circulatory heated water systems; and
  2. 1.2 m/s for the flow and 1.0 m/s for the return of a copper circulatory heated water service for more than 1% of the time that water is required during the peak hour; and
  3. 1.0 m/s for the flow and return of a circulatory heated water service using other materials for more than 1% of the time that the water is required during the peak hour.

Explanatory information

High velocities in heated water services can be a contributing factor to the erosion/corrosion of pipework. Consideration should be given to the appropriate velocities for the building based on water temperature, water chemistry and materials used.

(1) Access must be available to heated water service pipework for maintenance of mechanical components and operational controls.

VIC B2P4 Access and isolation2019: BP2.3

Delete subclause B2P4(1) and insert B2P4(1) as follows:

(1) Access must be available to the heated water service for maintenance of mechanical components and operational controls.

(2) Heated water service pipework, appliances and devices must be capable of being isolated for testing and maintenance.

Containers used for producing and/or storing heated water are to relieve excessive pressure and avoid flash steam production by—

  1. relieving pressure so that the maximum rated working pressure, or 1400 kPa, whichever is the lesser, is not exceeded; and
  2. limiting water temperatures to a maximum of 99 °C; or
  3. other suitable means providing an equivalent level of safety to (a) and (b).

Applications

B2P5(a) has a tolerance of +5% or 14 kPa whichever is the greater.

Heated water must be stored and delivered under conditions which avoid the likelihood of the growth of a Legionella bacteria count greater than or equal to 10 Legionella colony forming units (cfu) per millilitre.

Explanatory information

A risk assessment should be undertaken for the control and management of Legionella in heated water systems in aged care, health-care and other similar facilities with high risk occupants.

NCC Title

Energy use and source

NCC State
QLD
NCC Variation Type
Deletion
NCC SPTC Current
Energy use and source

(1) A heated water service, including any associated distribution system and components, must ensure the efficient use of energy and water.

(2) Features in B2P7(1) must be appropriate to the following:

  1. The heated water service and its usage.
  2. The geographic location of the building.
  3. The location of the heated water service.
  4. The energy or water source.

VIC B2P7 Energy use and source2019: BP2.6

Insert VIC subclause B2P7(3) in clause B2P7 as follows:

(3) A solar water heater system installed in a new Class 1 building to comply with Part 2.6 and Part 3.12 of NCC 2019 Volume Two must comply with the Plumbing Regulations 2018.

Explanatory information

Excessive ‘dead water’ draw-off, i.e. where cooled water from the supply pipe is drained off prior to delivery of heated water, can result in water and energy wastage.

To improve the efficiency of heated water systems, the design should consider factors such as the number of outlets, their purpose and expected typical usage, and the distance between the water heater and each of the outlets. The water heater should be positioned nearest to the most used outlets, or installed to provide consistent coverage of the building. Where this is not viable, the use of multiple water heaters or a flow and return pipe loop may need to be considered.

B2P7(2) permits the energy source of the heated water service to be considered. This means that the net energy obtained from renewable energy sources such as solar, geothermal, wind, and biofuels may be considered as 'free' energy in calculating the energy consumption. Similarly, heat reclaimed from another 'free' source such as a by-product from co-generation type processes as well as other industrial processes, which could otherwise be rejected from the building, could be considered as 'free' energy in calculating the energy consumption.

A heated water service must ensure that heated water is provided at appropriate temperatures for the correct functioning of the fixture or appliance.

NCC Blurbs

The points of discharge for a heated water service must—

  1. have—
    1. a working pressure of not less than 50 kPa: and
    2. a static pressure within the building of not more than 500 kPa; or
  2. have water pressures suitable for the correct functioning of the fixture or appliance where water pressures outside of (a)(i) and (a)(ii) are required.

Exemptions

B2P9(a)(i) and B2P9(a)(ii) do not apply to existing low-pressure gravity only water services.

NCC Title

Pressure

NCC State
TAS
NCC Variation Type
Replacement
NCC SPTC Current
Pressure

The points of discharge for a heated water service must—

  1. have—
    1. a working pressure of not less than 50 kPa; and
    2. a static pressure within the building of not more than 500 kPa; or
  2. have water pressures suitable for the correct functioning of the fixture or appliance where water pressures are outside of (a)(i) and (a)(ii) are required.

A heated water service must avoid failure or uncontrolled discharge.

A heated water service must ensure the efficient use of drinking water by limiting water use from a tap or outlet for a shower, basin, kitchen sink or laundry trough to a flow rate of not more than 9 l/m.

Verification Methods

Compliance with B2P6 is verified for each heated water storage system when the water heater is designed such that all water is subjected to a temperature-dependent minimum exposure period as specified in Table B2V1 within 7 days before passing through the water-heating appliance's heated water outlet.

Table B2V1 Heated water storage minimum exposure period
Temperature Minimum exposure period
70 °C or greater 1 second
66 °C 2 minutes
60 °C 32 minutes

Deemed-to-Satisfy Provisions

(1) Performance RequirementB2P1 is satisfied if heated water is supplied by—

  1. the Network Utility Operator’s drinking water supply; or
  2. an alternative drinking water supply.

(2) Where a Deemed-to-Satisfy Solution is proposed, Performance Requirements B2P2 to B2P11 are satisfied by complying with B2D2 to B2D11.

(3) Where a Performance Solution is proposed, the relevant Performance Requirements must be determined in accordance with A2G2(3) and A2G4(3) as applicable.

(4) Where it is proposed to use a warm water system, Performance Requirement B2P6 must be complied with.

Notes

There are no Deemed-to-Satisfy Provisions for warm water systems.

NCC Blurbs

(1) In an established Class 1 building connected to a reticulated gas supply or a new Class 1 or Class 10 building, a water heater must be one of the following types:

  1. A natural gas or LPG water heater, either instantaneous, continuous flow or storage, that has an energy rating of 5 stars or more.
  2. A natural gas or LPG boosted solar water heater, with a total tank volume of not more than 700 litres, that is eligible for any number (one or more) of STCs.
  3. An electric boosted solar water heater or electric heat pump water heater (air source or solar boosted), with a single tank, that is eligible for the minimum small-scale technology certificates shown in SA Table B2D2.
  4. A wood combustion water heater, with no additional heating mechanisms, with a total tank volume of not more than 700 litres.
  5. A wood combustion boosted solar water heater, with no additional heating mechanisms, with a total tank volume of not more than 700 litres.

(2) In an established Class 1 building that is not connected to a reticulated gas supply, a water heater must be one of the following types:

  1. A water heater complying with the requirements set out in (1).
  2. An electric water heater with a rated hot water delivery of no greater than 250 litres.
  3. An electric instantaneous water heater, having a water storage capacity no greater than one litre and total electrical input no greater than 15.0 kW.

(3) The requirements of (1) and (2) do not apply to any of the following:

  1. Water heaters serving buildings other than Class 1.
  2. Repairs to water heaters including:
    1. Like for like replacements that are the result of manufacturer, supplier or installer warranty arrangements.
    2. Replacement of a single major component of a solar or electric heat pump water heater (for example, a heat pump compressor/evaporator unit, a solar collector, or a storage tank).
  3. Secondary electric water heaters of up to 55 litres rated delivery, which do not serve a shower or bath.
  4. Temporary electric water heaters of up to 55 litres rated delivery, for a period not exceeding 60 days, pending installation of a complying water heater.
  5. An electric or gas vented (gravity fed) water heater, located in a roof space of an established Class 1 building, of no greater than 250 litres rated hot water delivery.
  6. A gas water heater installed entirely within a fully enclosed roof space, room or attached garage of an established Class 1 building, providing the water heater has an energy rating of 3 stars or more.
Insert SA table (B2D2) B2D2 as follows:
SA Table B2D2: Small-scale technology certificates
Year Tank volume of 400 litres or more and not more than 700 litres Tank volume of more than 220 litres and less than 400 litres Tank volume of not more than 220 litres
2022 34 in zone 3* and/or 32 in zone 4 24 in zone 3 and/or 23 in zone 4 15 in zone 3 and/or 14 in zone 4
2023 30 in zone 3 and/or 28 in zone 4 21 in zone 3 and/or 20 in zone 4 13 in zone 3 and/or 12 in zone 4
2024 26 in zone 3 and/or 25 in zone 4 18 in zone 3 and/or 18 in zone 4 11 in zone 3 and/or 11 in zone 4
2025 22 in zone 3 and/or 21 in zone 4 16 in zone 3 and/or 15 in zone 4 10 in zone 3 and/or 9 in zone 4
Table Notes

* Zones are defined by the Clean Energy Regulator

Explanatory information: Connection to a reticulated gas supply

A property is connected to a reticulated gas supply if it has a piped connection to a gas distribution system and this connection is capable of supplying gas to gas equipment and/or appliances.

A property is not connected to a reticulated gas supply if:

  • It does not have a piped connection to a gas distribution system; or
  • It has a piped connection to a gas distribution system but this connection is not capable of supplying gas to gas equipment and/or appliances (for example, if the supply has been physically disconnected at the meter by the gas network operator).

Reticulated gas includes:

  • Reticulated natural gas; or
  • Reticulated compressed gas of some other type (including LPG, SNG or TLP gas).

Explanatory information: Gas water heaters

The energy ratings for natural gas and LPG water heaters are available at: http://www.aga.asn.au/product_directory

Explanatory information: Solar water heaters and electric heat pump water heaters

STCs are Small-scale Technology Certificates. References to Renewable Energy Certificates (RECs) refer equally to STCs. The number of STCs is provided for each eligible model of solar water heater and electric heat pump water heater at: https://www.cleanenergyregulator.gov.au/RET/Scheme-participants-and-industry/Agents-and-installers/Small-scale-systems-eligible-for-certificates/Register-of-solar-water-heaters

The STC values specified in Section SA B2D2 for either CER Zones 3 or 4 may be used to demonstrate compliance, regardless of the actual zone in which the water heater is to be installed.

NCC Title

Water heater in a heated water supply system

NCC State
SA
NCC Variation Type
Replacement
NCC SPTC Current
Water heater in a heated water supply system
NCC Blurbs

In a new Class 1 or Class 10 building—

  1. a water heater in a heated water supply system must be—
    1. a solar water heater complying with (b); or
    2. a heat pump water heater complying with (b); or
    3. a gas water heater complying with (c); or
    4. an electric resistance water heater complying with AS/NZS 3500.4; or
    5. a wood fired thermosiphon water heater or direct fired water heater each complying with AS/NZS 3500.4; and
  2. a solar water heater and a heat pump water heater must have—
    1. for a building with 1 or 2 bedrooms—
      1. at least 14 Small-scale Technology Certificates for the zone where it is being installed; or
      2. an energy saving of not less than 40% in accordance with AS/NZS 4234 for a "small" load system; and
    2. for a building with 3 or 4 bedrooms—
      1. at least 22 Small-scale Technology Certificates for the zone where it is being installed; or
      2. an energy saving of not less than 60% in accordance with AS/NZS 4234 for a "medium" load system; and
    3. for a building with more than 4 bedrooms—
      1. at least 28 Small-scale Technology Certificates for the zone where it is being installed; or
      2. an energy saving of not less than 60% in accordance with AS/NZS 4234 for a “large” load system; and
  3. a gas water heater must be rated not less than 5 stars in accordance with AS 4552.
NCC Title

Water heater in a heated water supply system

NCC State
TAS
NCC Variation Type
Replacement
NCC SPTC Current
Water heater in a heated water supply system
NCC Title

Water heater in a heated water supply system

NCC State
QLD
NCC Variation Type
Deletion
NCC SPTC Current
Water heater in a heated water supply system
NCC Title

Water heater in a heated water supply system

NCC State
NSW
NCC Variation Type
Deletion
NCC SPTC Current
Water heater in a heated water supply system
NCC Notice

Compliance is not required with the national provisions of B2D2 as the sources of energy for new Class 1 and 10 buildings are regulated under BASIX.

(1) In a new Class 1 or Class 10 building, a water heater in a heated water supply system must be—

  1. a solar water heater complying with (2); or
  2. a heat pump water heater complying with (2); or
  3. a gas water heater complying with (3); or
  4. an electric resistance water heater only in the circumstances described in (4); or
  5. a wood fired thermosiphon water heater or direct fired water heater each complying with AS/NZS 3500.4.

(2) In a new Class 1 or Class 10 building a solar water heater and a heat pump water heater must comply with either—

  1. Table B2D2a, for the minimum Small-scale Technology Certificates for the installation zone; or
  2. Table B2D2b, for the minimum energy savings calculated in accordance with AS/NZS 4234.

(3) In a new Class 1 or Class 10 building, a gas water heater must be rated not less than 5 Stars in accordance with AS 4552.

(4) In a new Class 1 or Class 10 building, an electric resistance water heater with no storage or a heated water delivery of not more than 50 litres in accordance with AS 1056.1 may be installed when—

  1. the building has—
    1. not more than 1 bedroom; and
    2. not more than 1 electric resistance water heater installed; or
  2. the building has—
    1. a water heater that complies with (2) or (3); and
    2. not more than 1 electric resistance water heater installed; or
  3. the greenhouse gas emission intensity of the public electricity supply is low.

VIC B2D2 Water heater in a heated water supply system2019: B2.2

Insert VIC subclause B2D2(5) in clause B2D2 as follows:

(5) A solar water heater system installed in a new Class 1 building to comply with Part 2.6 and Part 3.12 of NCC 2019 Volume Two must comply with the Plumbing Regulations 2018.

Table B2D2a Minimum Small Scale Technology Certificates
Number of bedrooms in the building 2022 2023 2024 2025
1 or 2 12 11 9 8
3 or 4 19 17 15 13
4 or more 25 22 19 16
Table B2D2b Minimum energy savings
Number of bedrooms Minimum energy saving
1 or 2 40% for a ‘small load’ system
2 or 3 60% for a ‘medium load’ system
4 or more 60% for a ‘large load’ system

Where both a heated water tap and a cold water tap are installed, the heated water tap must be installed to the left of, or above, the cold water tap if—

  1. each tap controls a separate outlet; or
  2. both taps control a combined flow of water delivered through a single outlet.

Explanatory information

To reduce the likelihood of scalding in a bath, consideration should be given to installing taps out of reach of the bath occupants. This would reduce the likelihood of children accidentally turning the heated water on or adjusting the water temperature.

To reduce the likelihood of scalding, consideration should be given to the following when installing heated water taps in a shower:

  • Heated water taps such as a quarter turn tap should be located in a manner, that to be turned on, requires the tap lever to be turned upwards, reducing the likelihood of accidentally turning the heated water on in the event of a slip or fall. Likewise, cold water taps should be located in a manner, so that the lever operator is turned down to turn on the cold water.
  • Mixing taps, where the lever is lifted to start the flow of water, should be considered because if a slip or fall occurred, there is greater likelihood that the temperature would either be reduced or the tap turned off.
  • The location of shower taps should be positioned at a height so that they cannot be operated by young children.
  • Positioning the taps in a specific recess may reduce the likelihood of accidentally altering the water temperature in the event of a slip or fall and is considered a suitable recommendation for bathrooms provided for the elderly or infirm.

A tap or outlet used for a shower, basin, kitchen sink, or laundry trough must be a minimum of 3 Star WELS rated and discharge not more than 9 litres per minute.

Exemptions

The requirements of B2D4 do not apply to a shower intended to provide rapid drenching of a person for emergency purposes, such as chemical removal.

Applications

A heated water outlet includes an outlet which delivers any combination of heated water and cold water.

Explanatory information

AS/NZS 6400 Water Efficient Products - Rating and labelling, provides the basis for the rating and labelling of a range of products under the mandatory Water Efficiency Labelling and Standards (WELS) Scheme.

B2D4 outlines the minimum level of water efficiency for certain plumbing products and fixtures, however the adoption of products and technologies of greater efficiency should be considered.

NCC Blurbs

The delivery temperature of heated water at the outlet of each sanitary fixture must be—

  1. not more than 45 °C in any—
    1. residential part of an aged care building; or
    2. patient care area in a health-care building; or
    3. part of an early childhood centre, or primary or secondary school, that is used by children; or
    4. designated accessible facility in a common area of a Class 2 building, or in any part of a Class 3, Class 5, Class 6, Class 7, Class 8, Class 9a, 9b, 9c or Class 10 building; or
  2. not more than 50 °C in all other cases.

Applications

B2D5 applies to all heated water installations intended for personal hygiene.

Exemptions

B2D5(b) does not apply to the replacement of a water heater unit in the same location where the original installation did not require a temperature control valve.

Explanatory information

Scenarios covered in B2D5 may include where—

  • a heated water service is installed on the premises for the first time; or
  • the water heater forming part of an existing heated water service is—
    • replaced with a like-for-like water heater; or
    • replaced with a different type of water heater; or
    • relocated, and is reconnected to, some or all of the sanitary fixtures to which it was previously connected; or
  • more than one existing sanitary fixture is replaced with new similar fixtures; or
  • an existing heated water service on the premises is altered or extended to serve additional sanitary fixtures.

Consideration should be given to the intended occupants of a building when commissioning the heated water delivery temperature. For example, if the occupants of a Class 1 building are older adults or young children, a lower temperature than specified in B2D5(b) should be considered.

NCC Title

Maximum delivery temperature

NCC State
VIC
NCC Variation Type
Replacement
NCC SPTC Current
Maximum delivery temperature
NCC Blurbs

(1) The delivery temperature of heated water at the outlet of each sanitary fixture must be—

  1. not more than 45 °C in any—
    1. residential part of an aged care building; or
    2. patient care area in a health-care building; or
    3. part of an early childhood centre, or primary or secondary school, that is used by children; or
    4. designated accessible facility in a common area of a Class 2 building, or in any part of a Class 3, Class 5, Class 6, Class 7, Class 8, Class 9a, 9b, 9c or Class 10 building; or
  2. not more than 50 °C in all other cases.

(2) Heated water services in buildings constructed after 19 October 1995 shall have temperature control in accordance with 1(a) and (b).

(3) All new solar water installations (including solar water heater replacements) shall be in accordance with 1(a) and (b).

(4) Where an existing building is altered or extended in such a way that sanitary fixtures used primarily for personal hygiene purposes are installed in a location where, before the alteration or extension, no such fixture existed, the delivery temperature at the fixture shall be in accordance with 1(a) and (b).

(5) Where a water heater is replaced, a temperature control device is required where such a device was in place prior to the installation of the replaced water heater. The device must meet the requirements of 1 (a) and (b).

Applications

B2D5 applies to all heated water installations intended for personal hygiene.

Explanatory information

Scenarios covered in B2D5 may include where—

  • a heated water service is installed on the premises for the first time; or
  • a water heater forming part of an existing heated water service is—
    • replaced with a like-for-like water heater; or
    • replaced with a different type of water heater; or
    • relocated, and is reconnected to, some or all of the sanitary fixtures to which it was previously connected; or
  • more than one existing sanitary fixture is replaced with new similar fixtures; or
  • an existing heated water service on the premises is altered or extended to serve additional sanitary fixtures.

Consideration should be given to the intended occupants of a building when commissioning the heated water delivery temperature. For example, if the occupants of a Class 1 building are older adults or young children, a lower temperature than specified in B2D5(b) should be considered.

A duty of care should be exercised by installers to explain to clients the merits of temperature control for heated water delivered to existing sanitary fixtures used primarily for personal hygiene purposes.

NCC Title

Maximum delivery temperature

NCC State
SA
NCC Variation Type
Replacement
NCC SPTC Current
Maximum delivery temperature
NCC Blurbs

The delivery temperature of heated water at the outlet of each sanitary fixture must be—

  1. not more than 45°C in any—
    1. residential part of an aged care building; or
    2. patient care area in a health-care building; or
    3. part of an early childhood centre, or primary or secondary school, that is used by children; or
    4. any facility designated for use by people with a disability; or
  2. not more than 50°C in all other cases.

Applications

B2D5 applies to all heated water installations for personal hygiene purposes.

NCC Title

Maximum delivery temperature

NCC State
NSW
NCC Variation Type
Replacement
NCC SPTC Current
Maximum delivery temperature

The delivery temperature of heated water at the outlet of each sanitary fixture must be—

  1. not more than 45 °C in any—
    1. residential part of an aged care building; or
    2. patient care area in a health-care building; or
    3. part of an early childhood centre, or primary or secondary school, that is used by children; or
    4. designated accessible facility in a common area of a Class 2 building, or in any part of a Class 3, Class 5, Class 6, Class 7, Class 8, Class 9a, Class 9b, Class 9c or Class 10 building; or
  2. not more than 50 °C in all other cases.

Applications

B2D5 applies to all heated water installations intended for personal hygiene.

Explanatory information

Scenarios covered in B2D5 may include where—

  • a heated water service is installed on the premises for the first time; or
  • the water heater forming part of an existing heated water service is—
    • replaced with a like-for-like water heater; or
    • replaced with a different type of water heater; or
    • relocated, and is reconnected to, some or all of the sanitary fixtures to which it was previously connected; or
  • more than one existing sanitary fixture is replaced with new similar fixtures; or
  • an existing heated water service on the premises is altered or extended to serve additional sanitary fixtures.

Consideration should be given to the intended occupants of a building when commissioning the heated water delivery temperature. For example, if the occupants of a Class 1 building are older adults or young children, a lower temperature than specified in B2D5(b) should be considered.

NCC Blurbs

(1) A temperature control device used to deliver heated water in accordance with B2D5(a) must be a—

(a) thermostatic mixing valve; or

(b) thermostatically controlled tap.

(2) A temperature control device used to deliver heated water in accordance with B2D5(b) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap; or
  3. tempering valve; or
  4. temperature limited water heater.

(3) The required maximum delivery temperature must be achieved in accordance with AS/NZS 3500.4.

(4) Thermostatic mixing valve work must comply with AS 4032.3 Water Supply - Valves for the control of heated water supply temperatures - Part 3: Requirements for field testing, maintenance or replacement of thermostatic mixing valves, tempering valves and end of line temperature control devices.

Applications

B2D6 applies to all heated water installations intended for personal hygiene.

Explanatory information

Scenarios covered by B2D6 may include where—

• a heated water service is installed on the premises for the first time; or

• the water heater forming part of an existing heated water service is—

• replaced with a like-for-like water heater; or

• replaced with a different type of water heater; or

• relocated, and is reconnected to, some or all of the sanitary fixtures to which it was previously connected; or

• more than one existing sanitary fixture is replaced with new similar fixtures; or

• an existing heated water service on the premises is altered or extended to serve additional sanitary fixtures.

NCC Title

Temperature control devices

NCC State
VIC
NCC Variation Type
Replacement
NCC SPTC Current
Temperature control devices
NCC Blurbs

(1) A temperature control device used to deliver heated water in accordance with B2D5(a) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap.

(2) A temperature control device used to deliver heated water in accordance with B2D5(b) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap; or
  3. tempering valve; or
  4. temperature limited water heater limited to 50°C in accordance with AS 3498.

(3) The required maximum delivery temperature must be achieved in accordance with AS/NZS 3500.4.

Applications

B2D6 only applies to new and replacement heated water installations.

Exemptions

B2D6 does not apply to the replacement of a single heated water storage unit within a range or bank of heaters.

NCC Title

Temperature control devices

NCC State
TAS
NCC Variation Type
Replacement
NCC SPTC Current
Temperature control devices
NCC Blurbs

(1) A temperature control device used to deliver heated water in accordance with B2D5(a) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap.

(2) A temperature control device used to deliver heated water in accordance with B2D5(b) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap; or
  3. tempering valve; or
  4. temperature limited water heater with a maximum delivery temperature of 50°C marked in accordance with AS 3498.

(3) The required maximum delivery temperature must be achieved in accordance with AS/NZS 3500.4.

Applications

B2D6 only applies to—

  1. all new heated water services; or
  2. replacing a hot water heater, regardless of the type or location of the heater.

Exemptions

A temperature control device need not be installed if one or more, but not all, heating units in a manifold water heater are replaced.

NCC Title

Temperature control devices

NCC State
NSW
NCC Variation Type
Replacement
NCC SPTC Current
Temperature control devices

(1) A temperature control device used to deliver heated water in accordance with B2D5(a) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap.

(2) A temperature control device used to deliver heated water in accordance with B2D5(b) must be a—

  1. thermostatic mixing valve; or
  2. thermostatically controlled tap; or
  3. tempering valve; or
  4. temperature limited water heater.

(3) The required maximum delivery temperature must be achieved in accordance with AS/NZS 3500.4.

Applications

B2D6 applies to all heated water installations intended for personal hygiene.

Explanatory information

Scenarios covered by B2D6 may include where—

  • a heated water service is installed on the premises for the first time; or
  • the water heater forming part of an existing heated water service is—
    • replaced with a like-for-like water heater; or
    • replaced with a different type of water heater; or
    • relocated, and is reconnected to, some or all of the sanitary fixtures to which it was previously connected; or
  • more than one existing sanitary fixture is replaced with new similar fixtures; or
  • an existing heated water service on the premises is altered or extended to serve additional sanitary fixtures.

Containers used for producing and/or storing heated water must be provided with a temperature and pressure relief device in accordance with AS/NZS 3500.4.

Legionella control for water heaters must be carried out in accordance with AS/NZS 3500.4.

NCC Blurbs

A heated water service must be in accordance with AS/NZS 3500.4 with the following variations—

  1. substitute AS/NZS 3500.4 clause 5.8(c) with: 5.8(c) All new or replacement unvented storage water heaters shall be fitted with new temperature/pressure relief and expansion control valves.
  2. substitute AS/NZS 3500.4 clause 5.11.2.1 with: 5.11.2.1 The drain lines from the outlet of the temperature/pressure-relief valve and the expansion control valve on an individual water heater shall not be interconnected.
  3. substitute AS/NZS 3500.4 clause 5.11.3(e) with: 5.11.3(e) All drain lines shall discharge separately over a gully, tundish or other visible approved outlet.
NCC Title

General requirements

NCC State
SA
NCC Variation Type
Replacement
NCC SPTC Current
General requirements

A heated water service must be in accordance with AS/NZS 3500.4.

A heated water service in a designated bushfire prone area must be in accordance with AS 3959.

A solar heated water supply system for food preparation and sanitary purposes, where installed in a new building in climate zones 1, 2 or 3, is not required to comply with Section 8 of AS/NZS 3500.4.

Explanatory information: Cross-volume considerations

NCC Volumes One and Two deal with a number of areas of on-site construction which are relevant to a heated water service. They include, but may not be limited to, those listed in Table B2.

Table B2 Cross-volume considerations
Item NCC Volume One Class 2 to 9 buildings NCC Volume Two Class 1 and 10 buildings
Excavations for pipework adjacent to a building and footings B1 Structural provisions H1 Structure
Termite management for attachments to buildings and penetrations through a slab B1 Structural provisions H1 Structure
Penetrations for pipework through a vapour barrier B1 Structural provisions H1 Structure
Pipework in timber bearers and joists of solid timber or engineered wood products B1 Structural provisions H1 Structure
Fittings, fixtures and pipework installations in steel framed construction B1 Structural provisions H1 Structure
Penetrations through a fire-resisting wall or floor C1 Fire resistance Performance Requirements and C4 Protection of openings H3 Fire safety
Fixtures and fittings in a wet area F2 Wet areas and overflow protection H4 Health and amenity
Service pipework external to the building and penetrations through roof cladding in a bushfire prone area G5 Construction in bushfire prone areas H7 Ancillary provisions and additional construction requirements
Pipework sound insulation F7 Sound transmission and insulation H4 Health and amenity
Flues, chimneys, pipes, gas storage, domestic fuel tanks, cooling or heating appliances or other services C4 Protection of openings H3 Fire safety
Central heating pipework J6 Air-conditioning and ventilation systems H6 Energy efficiency
Pool and spa heating and pumping - energy efficiency J8 Heated water supply and swimming pool and spa pool plant H6 Energy efficiency
Energy consumption monitoring for water heaters J9 Facilities for energy monitoring Not applicable