Radiant Heating Report: Radiant Oasis
At more than 18,000 sq. ft. of total heated surface, the Qadi Villa is one of Jordan's largest residences using underfloor radiant heat. The radiant system for the 22,753-sq. ft., three-story home consists of almost 90 loops of 1/2-inch PEX, all powered by one 425,600 Btu/hr. boiler. (Another 93,000 Btu/hr. boiler takes care of the domestic hot water.)
The 4,725-sq. ft. swimming pool is heated with 24 loops of underfloor radiant. A separate boiler room powers the pool and its surroundings.
Considering the drastic temperature swings from day to night, insulation is a bit different from the United States. The floors, for example, are layered from top to bottom with ceramic tile, gravel, PEX and, finally, a reflecting barrier with foam concrete insulation.
Thirteen German-made Kromschroder modulating controllers with exterior and interior sensors provide 13 zones. Four subzones were added to a master bedroom using manifold telestats.