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.