We have a concrete slab radiant floor that is currently heating by propane tankless boiler (Lochinvar NKC199N), but as you know LPG is expensive and not quite efficient. Now, I am thinking about adding a Hybrid Water Heater tank dedicates only to my concrete slab radiant, to send 120F water to the slab using heat pump mode only. I am looking at Rheem Performance Platinum 50 Gal.
So question are:
- Could the hybrid water heater keep up with concrete slab in Winter? We are in Massachusetts, cold days could drop to single digit Fahrenheit.
- If we send 120F in the slab and comes out 100F, how long does it take to heat 100F water? or start at the beginning, how long does it take to heat 50F water from the well.