Wet underfloor heating is typically cheaper to run than radiators. It uses low-temperature heat over a large area, so less energy is needed to heat a room. It’s estimated that wet underfloor heating is 15% to 25% more efficient than radiators.Electric underfloor heating, on the other hand, is more expensive to run than radiators, because electricity is more expensive than gas – and in most UK homes, radiators are powered by gas boilers.