Plate Exchanger for Radiant Heat
I recently installed 1/2” pex under a new cement slab in my 50+ year old home. 2 loops covering 500sqft total. 4” slab with 2”xps underneath. Climate zone 5.
I’m trying to think of the best way to provide hot water for the slab while not taking up much space in the utility closet where my furnace and 40 gallon hot water heater is located. There isn’t much real estate available for a second HWH. Buying a tankless HWH is an option but it would be nice to utilize what I already have to keep costs down.
I’m not a fan of the idea of using potable hot water for the slab heat.
My thoughts are to use a plate exchanger to separate the hydronic system from the potable water such as:
Plate Exchanger 75 Kbtu at Menards
What I don’t know is if a domestic hot water heater set at under 120 degF is hot enough to transfer the heat needed to be used for in slab heat.
Is a plate exchanger 100% efficient in that an input of 115 degF will result in an output of 115 degF?
Any other ideas on what could work well?
Thanks for your time.