适用于容量为6.5至450 L的恒温控制加热器的设计、材料、结构、隔热和性能，设计压力高达120 kPa（12 mH2O），安装在垂直位置，可向NZS 4603通风，也可向NZS 4607通风。

Applies to the design, materials, construction, thermal insulation and performance of thermostatically controlled heaters of 6.5 to 450 L capacity designed for pressures up to 120 kPa (12 mH2O), installed in a vertical position either open-vented to NZS 4603 or valve-vented to NZS 4607.