Re: Radiant floor heat from fireplace

[kraphtsman]

You might want to consider installing a heat exchanger. Circulate ethyl-glycol through the radiator in the fireplace, routed into an insulated hot water storage tank, from which you would pump a heated water/antifreeze mixture into your radiant floor’s PEX tubing as needed. A second thermostatically controlled cold-water valve/cooling-coil could be added to the storage tank to prevent overheating.