Natural Draught (Instantaneous Gas Water Heater) Building Codes & Rules

All Building Classes

NCC 2022 J1P3 & H6P2 [2019 P2.6.2]

May 2023

• Domestic services to be energy efficient to the NCC
• Covered areas & recesses with ≥ 2 Sides Open^{AS/NZS 5601.1:2022, 6.9.4}
• Ensure good air flow around Flue Terminal
• Use specific appliance type
• Balanced Flue, Room-sealed, Fan-assisted, or Outdoor-use appliances
• Covered areas & recesses with 1 Side Open^{AS/NZS 5601.1:2022, 6.9.4 (a)}
• Extend Flue Terminal past the corner or covered area
• Release fumes on open side
• Use a Fan-assisted appliance
• Balconies with any number of open sides^{AS/NZS 5601.1:2022, 6.9.4 (b)}
• Extend Flue Terminal & release towards open air
• Use a Fan-assisted appliance
• Appliance Temperature Around Flammable Materials^{AS/NZS 5601.1:2022, 6.9.4 (c)}
• ≤ 65°C Room Temperature near flammable surfaces
• Provide Air Gap between insulation & flammable substrate, for tight spaces
• Non-combustible materials covering combustible surfaces may conduct heat & may become a potential hazard
• Rules do not apply to outdoor Gas Grills & Heaters^{AS/NZS 5601.1:2022, 6.2.5}

• Ensure efficient exhaust of Gas & avoid causing an inconvenience to surrounding areas^{AS/NZS 5601.1:2022, 6.9.4}

Cold Water Inlet

Exteior Corner

To Exterior Corner of the Wall

From Gas Main

Earthed

Weatherproof

Power Supply

Water Supply Valve^{Manufacturer's Recommendation}

• Install to Manufacturer's Recommendation

Permissible Temperature

• ≤ 50°C for general use^{NCC 2022 Vol 3, B2D5 (b)}
• ≤ 45°C non-domestic^{NCC 2022 Vol 3, B2D5 (a)}

Maintenance & Servicing^{Manufacturer's Recommendation}

• Conduct minor maintenance every 6 months
• Major servicing every 5 years by qualified personnel

Shutoff Valve

Hot Water Inlet^{Manufacturer's Recommendation}

• Pipework for heated water must be insulated if delivering water to kitchen

Isolation

Valve

Relief Valve

≥ 1.5m^{AS/NZS 5601.1:2022, 6.9.3}

1.5m^{Tools™ Best Practice}

Air Inlets

≥ 500^{AS/NZS 5601.1:2022, 6.9.3}

Eaves, Balcony, or other Projection

Any building or structure

≤ 150 MJ/ Appliance Input

Drain / Soil Pipe

≥ 300^{AS/NZS 5601.1:2022, 6.9.3}

Energy Usage

• ≥ 5 Star GEMS Rating^{NCC 2022 Vol 2, H6P2 (1) (c)}

≤ 150 MJ/h Appliance Input

Water Heater

≥ 1m^{AS/NZS 5601.1:2022, 6.9.3}

Installation^{Manufacturer's System Requirement}

• Gas works to AS/NZS 5601.1
• Plumbing works to AS 3500.4
• Install according to Manufacturer's Recommendation
• Including recessed installation

≥ 1.5m^{AS/NZS 5601.1:2022, 6.9.3}

≥ 500^{AS/NZS 5601.1:2022, 6.9.3}

≥ 300^{AS/NZS 5601.1:2022, 6.9.3}

≥ 500^{AS/NZS 5601.1:2022, 6.9.3}

Fixed Window

Openable Window

≤ 50 MJ/h

Appliance

Input

> 50 MJ/h

Appliance

Input

Ground Level

≥ 500^{AS/NZS 5601.1:2022, 6.9.3}

To Drain / Soil Pipe

Flue Outlet

Full Flow

Gate Valve

> 250 MJ /h Appliance Input

> 250 MJ/h Appliance Input

Pressure

Limiting Valve

Safety Warning^{Manufacturer's Recommendation}

• Never use or store near the heater
• Combustible / flammable materials
• Swimming pool chemicals
• Household cleaners & the like
• Never use Propane & Butane Gas mixtures for Propane models
• No articles on or against the Water Heater
• Flue outlet
• Free from obstruction at all times
• Out of reach of children

≥ 150^{AS/NZS 5601.1:2022, 6.9.3}

≥ 500^{AS/NZS 5601.1:2022, 6.9.3}

Heater Location^{AS 1056.1:1991, 1.2 (b)}

• Outdoor installation only
• Accessible without the use of ladder or scaffolding
• Adequate clearance for servicing & maintenance
• Visible Rating Plate with operating information
• Installed upright
• Water, gas, & power union connections under the unit & pointed to the ground
• Clear Flue Outlet & Air Inlets of any obstructions

Flue Outlet / Terminal

• ≥ 450mm from Property Boundary if releasing fumes^[1]

Flue Terminal CLEARANCES

NCC 2022 V1

AS/NZS 5601.1:2022, 6.9.3 (b)

AS/NZS 5601.1:2022, 6.9.3 (b)