Regulation 20 Surface temperature

An oil heater shall be so constructed that, if it is tested in accordance with the test specified in Appendix F of the British Standard Specification of 1974, the surface temperature of any part of the heater described in Schedule 2 to these regulations will not exceed the limit specified in that Schedule in relation to that part:

Provided that nothing in this regulation shall apply to any part of a heater which is a working surface.