AS NZS 5263.1.3:2021 – Gas appliances Part 1.3: Gas space heating appliances
AS NZS 5263.1.3:2021 – Gas appliances Part 1.3: Gas space heating appliances. 5.12.101 Thermal efficiency based on gross heating value The thermal efficiency of an appliance based on gross heating value shall conform as follows: (a) Radiant heaters, when tested...