A.John Siegenthaler responds: There are several ways of combining low-temperature radiant floor heating with higher-temperature distribution systems, such as fin-tube baseboard convectors. Above all, the system must be designed 1) to prevent condensation within the boiler, and 2) with a specific type of control system.

Conventional boilers must have return water temperatures high enough to prevent sustained condensation on the fire-side of the boiler, or within the flue pipe. Water vapor is a byproduct of combustion, and if allowed to condense, it can cause severe corrosion. Flue pipes are especially vulnerable, and can fail in a matter of weeks when...

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