Underfloor heating is a way of distributing heat supplied by one of two sources:
Electricity
Hot water
These Systems require the laying of either electric cables or hot water pipes in a concrete floor slab. They are therefore generally appropriate for new houses only.
Electrical underfloor heating has the
advantage that power can be drawn
at a time of off-peak supply with
consequently cheaper costs.
Hot water underfloor heating requires a
heat source (boiler) and a circulating
pump together with mixing and control valves.
The temperature of the water is lower than conventional hot water radiator heating, about 50C, and is comparable with that which can be produced by a solar hot water system. Both electric and hot water systems have high installation costs, particularly the latter.
Heating & Cooling 
