Underfloor heating systems work by pumping a controlled flow of warm water from any heat source, like a boiler or accumulator, through tubing embedded in the floor. In a new build or extension, the UFH is typically laid within the floor. In a renovation, the UFH is often installed directly over the existing floor, causing minimal disruption and adding very little height build-up. Warm water underfloor heating uses far lower flow temperatures than a radiator system, and because it covers a much larger surface area it is still able to heat the room effectively. For this reason, UFH is around 25% more efficient than radiators.