Regulation 21 Fuel temperature

An oil heater, other than a pressure heater with a sealed fuel container, shall be so constructed that, if it is filled up to its full fuel level and allowed to burn under normal conditions until ninety-five per cent of the contents of the fuel container have been consumed, the temperature of the fuel remaining in the fuel container, determined in accordance with paragraph (2) of this regulation, shall not exceed 38°C in a room temperature of 16°C.

For the purpose of paragraph (1) above, the temperature of the fuel remaining in the container of a barometric feed oil heater shall be the temperature of the fuel after it has been mixed and the temperature of fuel remaining in the container of any other heater shall be the temperature of the top 5mm of the fuel.