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

The pump should be pumping away from the heater where the expansion tank is located. Circulating water will draw the temperature of the system down to the slab temperature and will rise as the slab is heated. As your flow is slowed down to .5 gpm due to the tubing resistance, there is plenty of time to cool on the way through the slab.

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