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condensing boiler

Keith_8
Keith_8 Member Posts: 399
in THE MAIN WALL
piping takes care of that. The boiler operates at non-condensing temps. The building loop maintains @ 95*.

A condensing boiler would seem to be a no brainer.

The boiler can modulate and stay on cruise control.

Keith

Comments

  • Keith_8
    Keith_8 Member Posts: 399
    modulating gas burner

    Looking for some feedback on a modulating gas burner/boiler used in a heat pump application.

    I'm doing a boiler survey this week. The building uses a Raypack boiler to maintain 95* water temp for their heat pump loop in the winter.

    Any thoughts?

    Keith

  • bigugh_4
    bigugh_4 Member Posts: 406
    Hummmm~~~~~~~~~~~

    Yes, a thought ! I'd hope the water gets hotter than that through the raypack, as condensation will be a factor. Check with Raypack for the specs and make sure they fit the application. excess water in the combustion chamber is really not good. Anyhow, bigugh
  • Ted_5
    Ted_5 Member Posts: 272
    What size?

    What are the flow rates needed? Viessmann Vertomat has no flow restrictions and would be around 96% combustion eff. at that water temp.

    Ted

    Viessmann rep.
  • Keith_8
    Keith_8 Member Posts: 399
    I'll know

    on Wednesday. If I remember correctly about 800,000 MBH.

    96% sounds good!

    The Raypack is probably closer to 80% efficiency?

    Keith
  • dconnors
    dconnors Member Posts: 215
    SB series Condensing boiler

    We dont require any particular return temp. The lower the better. Buderus.
  • Boilergeek
    Boilergeek Member Posts: 42
    kn-10

    A KN-10 boile woul be perfect for this application. 1 million Btu 98% condensing with 3 to 1 turndown.
    Sweet machine
    www.hydrothermkn.com
  • Constantin
    Constantin Member Posts: 3,796
    Another possibility:

    The Trinity 400 series from NTI offers a 16:1 turndown ratio. Put in two, stage them with a Tekmar, and you have the load covered from 25kBTU/hr all the way to 800kBTU/hr, for a combined turn-down ratio of 32:1. Can't really get any more efficient than that.

    Two little munchkins would do about the same with a range of 80kBTU/hr to about 798KBTU/hr or about 10:1.

    With that low of a supply temp, just about any condensing boiler should be in the 98%+ AFUE range, so I'd go with a condensing boiler for sure.

    One other thing you might want to mull is the following: Cost of electricity vs. the supply temperature for the heat pumps: At what water temperature is the plant operating at the most efficient (in therms of $ and cents) ratio of electricity to fuel costs.
  • c.t.kay
    c.t.kay Member Posts: 85
    condensing boilers

    look at this web site,gasmaster-ind.com.they make condensing boilers from 200000 to 8000000. the feed water temps can be very low,about 60 degrees. 7year thermal shock,etc.
  • Keith_8
    Keith_8 Member Posts: 399
    Thanks

    for the input guy's.

    You have given me a good jump on the direction to take.

    I'll let you know how the meeting goes.

    Keith
  • Me_8
    Me_8 Member Posts: 21


    Most of the loops I deal with use staged hydrotherm boilers, Have always thought a staged setup with a modulating or condensing first and a basic dirt simple staged rack would be the best of all worlds. might want to verify that 95* and check the specs of the heat pumps 70-75* is what we run loops at during the winter. and stage the tower for 95* or so in the summer
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