We just bought a house with working radiant heat floors connected to a 5 year old Tagaki tankless boiler that works fine, but is only required to come on twice a day.A second domestic boiler needs to be replaced... Can we replace both boilers with just one? Or would we better off leaving it alone and getting a second tankless or other boiler for the domestic water? Thanks!
You can use one but keep in mind to get one that can hold enough hot water to support both your heating and hot water usage especially in the winter and I would have a way to shut the water off to the radiant heat for the summer. Have you ever ask yourself why didn't the previous owner do that. Remenber if you go to one if it goes out you loose both heat and hot water. Myself I think I would stick to 2 and put a bypass in to connect the 2 system together in case you loose one so you will have a emergency back up for either of the systems
You can use a water heater for in floor heating applications. It cannot be the same water heater that is used to supply domestic hot water for your house. The water heater isn't really designed to provide heat for radiant heating and it will not provide enough heat in a cold climate for anything other than a supplemental heating system. If this is going to be your only heat, you will be better off using a properly sized propane boiler system for your radiant heating.
