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  1. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    Thanks everyone for your feedback and insight. After speaking with the HVAC designer I consulted after I purchased the boiler it appears the best thing to do is replace the boiler and go a different route. Dana's calculations are exactly right and unfortunately it’s not really practical to add...
  2. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    I was just looking at a Lochinvar Knight manual and surprisingly (at least to me) the recommended pump size for a 20 degree temp rise is Grundfos 26-99 or Taco 013 or 011. This got me rethinking my situation and now I am wondering if my pumps are in fact too small? This just seems like an...
  3. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    So I piped in a 40 gallon water heater as a buffer tank this weekend and still have cycling issues. My burner is still firing for only about 35 to 45 seconds before shutting off. I have a no contact thermometer that I used to take a bunch of readings on the piping. It appears the flow through...
  4. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    Hi Jim and BBP. Welcome to the party & thanks for the input. Its reassuring to hear that although my boiler and system design has obvious problems things are likely salvageable. I will let everyone know how my project works out. Hopefully i can address some of the issues this weekend...
  5. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    Unfortunately my past usage would probably be less accurate than a size based room by room calc. For the last two winters I haven't spent much time at home and kept the heat 60 degrees or lower the majority of the time without really heating my basement at all. In addition, I recently replaced...
  6. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    Yeah this whole process has been rather eye opening. I have learned an incredible amount in a short time, most of it pleasant, but then again, I am a ways from having a viable, efficient system. I had a hvac engineer check out my system last night and he indicated its not nearly as bad off as...
  7. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    Hi Dana, thank you for weighing in. Before I started my project I received bids from 2 plumbers. I requested bids on combi-boilers because of the marketing hype. Both plumbers happily told me they would install combi-boilers and charge me between five and six grand for the work. When asked...
  8. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    Thanks for the input Tom Thank you for your suggestion Tom. After posting my thread I noticed the earlier posts about buffer tanks and it looks like that will be a good place to start. Badger, in researching my project I have read a number of your comments on other member’s posts and...
  9. craigw78

    Need help with cycling issue- Monitor MZ25S Boiler

    I just finished installing a Monitor MZ25S Boiler and am having trouble with excessive cycling. It’s a NON-MODULATING combi boiler and the DHW side operates fine. However, when warmed up, and operating in heating mode, the burner fires for less than a minute and shuts down. The pump...
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