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A scale drawing of the room should be available, showing the position of any permanent floor fixtures such as bath, shower tray, kitchen units, built-in cupboards, etc. Underfloor heating should not be laid under such items; the remaining portion is the Œlive¹ floor area. It is recommended that a single underfloor heating valve should not serve an area greater than 15m2, in order to minimise pump head requirements. • The room heat requirement should be calculated in Watts using normal design methods, except: • Exclude heat loss through the floor. • Assume the room design air temperature to be 1ºC below the normal design value. Divide the room heat requirement by the live floor area, this will show the minimum heat output required from the floor surface. This figure must not be greater than what the underfloor heating system is able to deliver. The output of the equator single zone underfloor heating system will depend on the thickness of the floor screed and the type of floor covering.
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