Denray Posted January 22, 2015 Report Posted January 22, 2015 Can tankless water heaters be used for hydronic floor heating?
Marc Posted January 22, 2015 Report Posted January 22, 2015 There are models intended for such an application. I don't think it's smart to just use any old tankless for radiant applications. Marc
Chad Fabry Posted January 22, 2015 Report Posted January 22, 2015 I've used tankless heaters for radiant heating. The only concern is keeping the input temperature at or below the recommended maximum and the output at or below 135 degrees Fahrenheit. The heater doesn't care that it's heating the same water over and over and the circulator provides enough flow to start the firing sequence.
Scottpat Posted January 22, 2015 Report Posted January 22, 2015 I'm doing bank draws on a home that has about 1500 sf of radiant floor heat in its bathrooms and dance studio. They are using a tankless unit with a 5 gallon electric water heater, similar to what is needed for a recirculation pump on a tankless system. I was asking about this just last month when it was being installed. The contractor said it was the best and really the only way to install it so that it works properly.
kurt Posted January 22, 2015 Report Posted January 22, 2015 It's the only thing I'm seeing nowadays. Radiant and tankless.
Les Posted January 22, 2015 Report Posted January 22, 2015 Kurt remember when we were at WATTS? There was a concern from them, but I can't recall what. We never see radiant with tankless.
John Kogel Posted January 22, 2015 Report Posted January 22, 2015 For floor heat, I sometimes see Tankless with a 40 gal storage tank added. Kinda funny actually. []
kurt Posted January 22, 2015 Report Posted January 22, 2015 Kurt remember when we were at WATTS? There was a concern from them, but I can't recall what. We never see radiant with tankless. Yeah, I kinda remember that. I don't know why because it works great.
Denray Posted January 22, 2015 Author Report Posted January 22, 2015 Seems like the PEX folks say their stuff shouldn't be downstream of a tankless. Tanks a lot for all the replies!
Marc Posted January 23, 2015 Report Posted January 23, 2015 Anyone have a diagram or description of how a tankless heater, regular heater, radiant heating system and fresh water supply are all connected together? Marc
John Kogel Posted January 23, 2015 Report Posted January 23, 2015 Marc I could search for pics. The domestic supply is kept separate by running a pipe with a check valve to the heating loop. That supply Tee will have a shutoff valve and the check valve supplies make-up water to the closed loop when it is needed. Here are two systems both with tanks added. The first was a residence of about 2400 sq ft. This was a repo, not completed. The big Veismann system 3rd pic was in a colossal residence with a theatre and games room but only 3 bedrooms. Click to Enlarge 47.89 KB Click to Enlarge 37.04 KB Click to Enlarge 74.99 KB
Trent Tarter Posted January 23, 2015 Report Posted January 23, 2015 Can tankless water heaters be used for hydronic floor heating? Yes they can.
ghentjr Posted January 23, 2015 Report Posted January 23, 2015 Tank you, tank you very much! No tanks necessary !
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