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Boiler selection for radient floor heating & domestic HW

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Posted by Brian on January 05, 2008 at 20:51:19:

I am new to the world of boilers, and I could use some guidence in understanding my choices for a project I am undertaking...

I am currently gutting and rebuilding my house, and I want to install a radient floor system (PEX tube in concrete), and my contractor suggested a normal power vent HWT to supply the hot water. Space is a BIG premium in my house, and I dont have the height clearance for a tank of that size. I have been doing some research into my options, and here are my questions:

1) I want to install something that can support the floor heating system (~650 sqr feet) as well as domestic hot water (allowing me to eliminate the tankless hot water heater currently on the plans). Are there particular products that are superior for this type of operation (2 functions, no radiators) I have been researching the munchkin line of products, should I consider something else?

2) Are there boilers that serve as a "tankless hot water heater" in addition to the floor heating duties? (double duty in 1 package)

3) Should I consider a boiler + indirect Hot Water Tank to achieve my goal of floor heating and domestic HW instead of 1 device that serves double duty?

4) I also currently have a forced air furnace to heat the 2nd floor, is there a way to just do a boiler heat exchange + air handler/fan to have the boiler provide the heat for that as well? Would that be more cost effective than just a normal gas fired furnace? I have attemped to learn more about this, and I am coming up short.

Thank you all very much in advance for any help and advice you can give. It is greatly appreciated, as I always try to be an educated consumer.

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