I have radiant floor heating in my house, I share a 50 gal. natual gas water heater for both heating and domestic use. The 50 gal. heater is a standard off the shelf. What I am wanting to do id see about puting a tankless heater to pre-heat the water on the return back into the 50 gal. heater.
Has anyone heard or have done this. If so, should I get a whole house (3-5 gpm) or a smaller (1-3 gmp) tankless heater, since it will only be pre-heating the return from the floor...
my house is 1400 sqft, and have only one pumt on the radiant floor system....
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