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Huh! Can you hook it up to a tankless (cheaper) instead of a boiler and have the tankless directly heat the floor, and the indirect supply the potable side? I don't know the efficiency of indirects but tmaybe this could be an economical choice as far as up front costs and monthly costs.

You mention combining a boiler and an indirect. Whats an indirect?

Thanks for the reply Dana, and the info. I should provide more info. Radiant appeals to me because I can get it done in a slab for cheaper than a crawl space with a finished floor on it plus a separate heating system like a conventional forced air system. I know thats not the case for...

New Construction Hey Guys, Im getting ready to build a new house and was looking at in-floor heat using a tankless combined with a small tank to act as a "shock absorber" to keep the tankless, from cycling on all the time. In reading this thread I've come across some great posts by Dana and...