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  1. #1
    Join Date
    Mar 2002
    Location
    Northeastern Illinois
    Posts
    611
    Have you ever used an on demand water heater for infloor heat. Like the Bosch 38B. I used to use a 45000 Lochinvar copper boiler but, they quit making the one I used. The apps I need them for could be done with a water heater but, that isn't very eff. Let me know what you think!!! Thanks.
    If it ain't broke don't fix it!!

  2. #2
    Join Date
    Mar 2002
    Location
    Northeastern Illinois
    Posts
    611
    Anybody out there?
    If it ain't broke don't fix it!!

  3. #3
    Join Date
    Sep 2001
    Location
    East Stroudsburg, PA
    Posts
    13,215
    I know that some states have banned the use of water heaters for infloor heating.

    There are some very good condensing boilers, such as Munchkin, Viessman, the Weil-McLain Ultras, etc. that fit this bill nicely.

    I'm pretty certain that it's Mass. that has banned the use of water heaters, but I could be wrong.

    Have you checked out http://www.heatinghelp.com ? (The Wall)there are a lot of radiant guys there that could definitely answer your question about the on-demand heaters, and the legalities and pros/cons of using them in this app. I take it that these are real small radiant loops?

  4. #4
    Join Date
    Mar 2002
    Location
    Northeastern Illinois
    Posts
    611
    dave, I have asked on heatinghelp but no responses several times. I use the Munchkin boilers in houses and bigger projects. I was looking for something a little less costly. In basement infloor jobs it is hard to sell a $2000 boiler. I use water heaters because they are inexpensive and easy to install. I think I got about 40 of them working right now. I have about a dozen Lochinvar 45's out there. I like the Bosch 38 because the btu rating is about right and they are relativly cheap to buy. I have not used one for infloor projects though. I have a number of basement floors roughed in with Wirsbo and hope to find a suitable heating plant for them. Thanks for your thoughts!!
    If it ain't broke don't fix it!!

  5. #5
    Join Date
    Jan 2001
    Location
    Pacific Coast of Canada
    Posts
    4,008
    We are using this on an island in-floor job.
    http://www.takagi-usa.com/web2003/e02.htm

  6. #6
    Join Date
    Jan 2002
    Location
    tip of the mitt
    Posts
    1,974
    Here in michigan if a water heater is approved by the manufacturer for space heating the code allows it. Rinnai is the only one that comes to mind. It can be used as a stand alone heat source or heat and hot water supply with a heat exchanger. The other brands are probably the same but rinnai is the one I'm familar with.
    I have my own little world. But it's OK...they know me here.

  7. #7
    Join Date
    Mar 2003
    Posts
    7,321
    sometimes when you use those types of hot water heaters, you can achieve better results by adding a buffer tank. on small loads, they tend to overfire and cycle too much.

  8. #8

    Lochinvar 45

    Originally posted by Dof3
    Have you ever used an on demand water heater for infloor heat. Like the Bosch 38B. I used to use a 45000 Lochinvar copper boiler but, they quit making the one I used. The apps I need them for could be done with a water heater but, that isn't very eff. Let me know what you think!!! Thanks.
    Lochinvar still makes the 45000 Btu/Hr model you used previously. However, they have made this product much better. Previously the Mini-Fin (RB Models), this product has been replaced with the Solution (CB Models). These new models are offered from 45,000-260,000 Btu/Hr. check it out at:
    http://www.lochinvar.com/product.asp...d=CB045&ln=RSB

    All standard on this product now:
    -lo/hi/lo temperature control
    -built-in performance loop
    -top water connections
    -2 stage electronic ignition
    -built-in draft diverter

  9. #9
    Look into a peerless Pinacle, Modulating burner,condensing lightwieght quiet and seem to be holding up pretty good, about 2,000 for a 140,000.

  10. #10
    Join Date
    Nov 2004
    Location
    Seattle Area
    Posts
    96
    I spent two weeks last year rewiring and replumbing three "on demand" units in a 24,000 sq/ft. home. The "plumber" that installed the job allowed for no storage in the system. The "boilers" cycled every 30 seconds and would not heat the house nor domestic hot water. A lot of control rewiring and some added storage capacity the system works allright. I would never recommend an on demand system for heating unless it was 100% modulating, with storage capacity.

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