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Hydronic radiant floor heating (HRF) is usually associated with concrete slabs. The reason is that slab-embedded systems are relatively simple to install: Long circuits of 1/2-inch to 3/4-inch polyethylene, polybutylene, or rubber tubing are arranged over a layer of welded wire mesh and then buried in concrete (see "Radiant Slab Techniques," 8/92). But most homes have woodframed floors, and many of their owners are interested in radiant heat. Luckily, almost all HRF manufacturers have developed techniques for installing their equipment in these homes. The tubing used in wood-framed floors is the same as that used for radiant slabs. Contractors' costs for tubing in my area are 65¢ to 75¢ per linear foot (that's 65¢ to 75¢ per square foot of floor area