Reply To: hot water radiant heat with hot water heater, trouble with return
Harold Kestenholz

Your 22×20 slab is 440 square feet. If you spaced the tubing at 6-inch centers in one loop then your loop is over 800 feet long. If the tubing is 3/4-inch then you can’t expect to pump enough water through a loop 1/3 that long. Better get that 427 hooked up to a pumper or add maybe 4 pumps in series.

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