Open vented storage water heater system with supply from header tank

You can find detailed information about these systems in the following standards:

• AS/NZS 3500.4 Heated water services – Acceptable Solution
• NZBC G12/AS1 6.0 for Hot water supply systems

Typical hot water storage heater installation systems include:

• ·         An open vented system with supply from header tank (as per image)
• ·         An open vented system with supply via a pressure-reducing
• ·         A low pressure unvented system with supply via a pressure reducing valve
• ·         Mains pressure unvented system