Hot Water Service Building Codes & Rules

Tempered Hot Water

• Hot Water Temperature delivery at Baths, Showers, Hand Basins, Bidets
• ≤ 45°C for Aged / Disabled / Healthcare Facilities / Childcare or Schools^{NCC 2022 Vol 3, B2D5 (a)}
• ≤ 50°C for all other Buildings^{NCC 2022 Vol 3, B2D5 (b)}

Hot Water

• To Kitchens & Laundries

Insulation^{AS/NZS 3500.4:2021, 8.2.2}

• Thermal Insulation to AS 3500.4
• ≥ 500mm from Inlets, Outlets & Valves of Storage Tank
• Hot Water Piping continuously to Kitchen Sink & any buried or Concrete encased Pipes

Potable Water Supply

PLD

Isolation Valve

Water Supply Valves

• Installation to Manufacturer's Recommendations
• Metal components to AS 4032.1^{AS/NZS 3500.4:2021, 3.3 (a)}
• Clean Strainers after Flushing System^{AS/NZS 3500.4:2021, 3.3 (g) (ii)}

Electrical Circuit

• To AS/NZS 3000
• Not permitted with Gas System^{AS/NZS 5601.1:2022, 5.1.2}

Gas Supply Pipework

• To AS/NZS 5601.1

Line Strainer

Pressure Limiting Device

Pressure & Temperature

Relief Valve

• Thermal Insulation to AS 3500.4
• Clearance required for maintenance & replacement^{AS/NZS 3500.4:2021, 5.3.2 (d)}

≥ 25^{AS/NZS 3500.4:2021, 4.3.2.2}

150^{AS/NZS 3500.4:2021, 5.3.2 (d)}

clear

≥ 25^{AS/NZS 3500.4:2021, 4.3.2.2}

Location^{AS/NZS 3500.4:2021, 5.3.1}

• As close as possible to the most frequently used outlet
• Consider routing of Flues, Vent Pipes, drainage points

Storage Temperature

• ≥ 60°C^{AS/NZS 3500.4:2021, 1.11.2 (a)} to prevent bacteria growth

Service Access & Clearances

• Clearance for Anode replacement^{AS/NZS 3500.4:2021, 5.3.2 (e)}
• Ability to replace unit without major building or plumbing alterations^{AS/NZS 3500.4:2021, 5.3.2 (e)}
• Rating Plate to be visible^{AS/NZS 3500.4:2021, 5.3.2 (a)}

Isolation Valve

Non-Return Valve

Line Strainer

Insulation

Non-Return Valve

Non-Return Valve

Isolation Valve

Thermostatic Mixing Valve

Isolation Switch

Isolation Valve

Cold Water Expansion Valve

Insulation

≥ 500^{AS/NZS 3500.4:2021, 8.2.2}

≥ 500^{AS/NZS 3500.4:2021, 8.2.2}

Safety Tray

(Internal Installation)

• Ventilation^{AS/NZS 3500.4:2021, 5.3.3}
• Gas models flued if internally located, or
• Located away from openable Windows
• Heat Pump models to Manufacturer's Specifications

Installation

• Follow Manufacturer's installation instructions
• Specific details of model being installed
• Working pressure
• Specific Valve type & configuration
• Ventilation requirements & clearances
• Anode type dependent on water supply
• If a heat trap needs to be installed

Waste Water

• Uninterrupted gravity flow to discharge point^{AS 3660.3:2014, 3.2.1}
• Must discharge with an air gap to an approved waste point^{AS/NZS 3500.4:2021, 5.4.4.3 (a)}
• External installations may discharge to ground if location will not risk people or property^{AS/NZS 3500.4:2021, 5.11.3 (g)}
• Moisture against a building may encourage termite activity^{AS/NZS 3500.4:2021, 5.4.4.3 (d) (ii)}

Support

• Durable proprietary Tank Support & Safety Tray^{AS/NZS 3500.4:2021, 5.4.5}
• Floor to be leveled, stable & impenetrable
• ≥ 50mm Pre-cast Concrete^{AS/NZS 3500.4:2021, 5.5.3 (b) (ii)}
• ≥ 75mm Cast-in-place Concrete^{AS/NZS 3500.4:2021, 5.5.3 (b) (i)}

Protection from Damage

• Install impact barriers if at risk from vehicle movements