Water heater dimensions
Every New Zealand regulation's sizes for a water heater, side by side. Millimetres unless marked.
- G12/AS1Third Edition Amendment 142 Nov 2024
- NZS 4305:1996
- AS/NZS 5601.1:2013
- Kāinga Ora v2.1
| Building Code and standards | Client | ||||
|---|---|---|---|---|---|
| G12/AS1 | NZS 4305 | AS/NZS 5601 | Kāinga Ora | ||
| Capacity and temperature | |||||
| Storage capacity | |||||
| studio or one bedroom | ≥90 L | ||||
| two bedrooms | ≥135 L | ||||
| three or four bedrooms | ≥180 L | ||||
| five bedrooms | ≥300 L | ||||
| six bedrooms | ≥360 L | ||||
| Hot water at the outlets | ≤50 °C | 45–50 °C | |||
| care buildings | ≤45 °C | ||||
| communal hand basins | 45 °C | ||||
| Thermostat setting | ≥60 °C | ||||
| Cylinder | |||||
| Heat loss in a day | |||||
| 135 L | ≤1.4 kWh | ||||
| 180 L | ≤1.6 kWh | ||||
| 200 L | ≤1.7 kWh | ||||
| 225 L | ≤1.8 kWh | ||||
| 270 L | ≤2 kWh | ||||
| 300 L | ≤2.2 kWh | ||||
| 360 L | ≤2.5 kWh | ||||
| 450 L | ≤2.9 kWh | ||||
| Element, each cylinder | |||||
| studio to two bedrooms | 2 kW | ||||
| three or four bedrooms | 2–3 kW | ||||
| five bedrooms | 3 kW | ||||
| six bedrooms | 2–3 kW | ||||
| Relief probe, from the top | ≤150 | ||||
| within its top share | ≤20% | ||||
| Energy cut-off, before | ≤95 °C | ||||
| Drain pipe, cylinders over | >45 L | ||||
| Cupboard | |||||
| A | Cupboard width | ||||
| one to four bedrooms | ≥700 | ||||
| five or six bedrooms | ≥1400 | ||||
| Cupboard depth | ≥800 | ||||
| Figure 14 suits up to | ≤360 L | ||||
| B | Strap from top or bottom | ≤100 | |||
| or within top and bottom | ≤25% | ||||
| Centre strap, cylinders over | >200 L | ||||
| or set higher than | >12 m | ||||
| Straps, most | ≤4 | ||||
| Pipes through platform | ≥50 | ||||
| C | Safe tray drain | ≥40 | |||
| Valves and vent pipe | |||||
| D | Relief valve from heater | ≤1 m | ≤1 m | ||
| its drain, bends + metres | ≤12 | ||||
| E | Pipe to tempering valve | ≥1 m | |||
| Vent, over highest outlet | ≥3 m | ||||
| above it, tank fed | ≥300 | ||||
| above it, through a PRV | ≥1000 | ||||
| insulated above it | ≥300 | ≥300 | |||
| its diameter, over 3 kW | ≥20 | ||||
| Run to the kitchen sink | |||||
| F | Pipe run to the sink | ||||
| 10 mm pipe | ≤25 m | ||||
| 15 mm pipe | ≤12 m | ||||
| 20 mm pipe | ≤7 m | ||||
| mixed sizes, water held | ≤2 L | ||||
| G | Insulated from the heater | ≥2 m | |||
| Heat trap drop | ≥250 | ||||
| insulation past its top | ≥150 | ||||
| Gas water heater | |||||
| Thermal efficiency | |||||
| continuous flow | ≥75% | ||||
| storage, under 200 L | ≥75% | ||||
| storage, 200 L or more | ≥70% | ||||
| Gas to keep it hot | |||||
| storage, under 200 L | ≤0.27 kW | ||||
| storage, 200 L or more | ≤0.35 kW | ||||
| Gas flue terminal | |||||
| H | Below eaves or a balcony | ||||
| natural, up to – MJ/h | |||||
| natural, over – MJ/h | |||||
| fan, up to – MJ/h | |||||
| fan, over – MJ/h | |||||
| I | Above ground or a balcony | ||||
| From a wall corner | |||||
| natural draught | |||||
| fan assisted | |||||
| From an electricity meter | |||||
| From a drain or soil pipe | |||||
| natural draught | |||||
| fan assisted | |||||
| From a structure it faces | |||||
| From another terminal | |||||
| natural draught | |||||
| fan assisted | |||||
| J | Beside an opening | ||||
| natural, up to – MJ/h | |||||
| natural, over – MJ/h | |||||
| fan, up to – MJ/h | |||||
| fan, – to – MJ/h | |||||
| fan, over – MJ/h | |||||
| fan, opening it blows at | |||||
| From a mechanical inlet | |||||
| natural draught | |||||
| fan assisted | |||||
| K | Below an opening | ||||
| up to – MJ/h | |||||
| – to – MJ/h | |||||
| over – MJ/h | |||||
| Beside the gas meter | |||||
| relief valve regulator | |||||
| other regulators | |||||
| Above the gas meter | |||||
| relief valve regulator | |||||
| other regulators | |||||
| Below the gas meter | |||||
| natural gas | |||||
| LPG, relief valve | |||||
| LPG, other regulators | |||||
| Recess open one side, fan | |||||