Gas-fired radiant-tube heaters
The Illustrated Guide to Mechanical Building Services, Third Edition (BG 31/2017), by David Bleicher, published by BSRIA in 2017, states in relation to gas-fired radiant-tube heaters: ‘Gas is burnt in a long metal tube which consequently radiates heat. A metallic reflector positioned behind the tube directs the heat into the occupied space below. A fan is used to draw gas/air through the tube. The heater can be connected to an external flue or may discharge directly into the space. Efficiencies of 80% to 90% are possible with gas-fired systems. Adequate ventilation is essential for systems without an external flue.’
--BSRIA
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