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Thread: sizing boiler?

  1. #27
    Join Date
    Sep 2004
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    654
    Originally posted by hydronicsman

    By all means check out outdoor reset. With oil prices, why run the boiler wide open on those 40-50 degree days?
    How much do these reset controls really save? Any real life test results avaiable? My understanding is they save less than 5% on the heat bill, but cost hundreds to buy and install. Anyone?


  2. #28
    Join Date
    Apr 2003
    Location
    Eugene, Oregon
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    Originally posted by casturbo
    Originally posted by hydronicsman

    By all means check out outdoor reset. With oil prices, why run the boiler wide open on those 40-50 degree days?
    How much do these reset controls really save? Any real life test results avaiable? My understanding is they save less than 5% on the heat bill, but cost hundreds to buy and install. Anyone?

    Beckett's HeatManager is product that seems to work pretty well. We have installed some and have had no complaints.
    They claim 10-20% reduction in fuel consumption and work with oil, gas or propane. http://www.beckettcorp.com
    Proud supporter of Springfield Millers and Oregon Ducks.

  3. #29
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    Jan 2004
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    Lancaster PA
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    67,879
    We do most retro fits, and always use the IBR rating of the boiler, many times the 15% isn't there, but on alot of older houses it is.

    Swat, if I had a house that required 90,000, I'd use a boiler with an IBR rating of 90,000, and that would be about a 113,000 DOE rating. In a retro fit.

    New construction would depend on basement finnish.

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  4. #30
    Join Date
    Feb 2005
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    655
    Do not oversize like some idiots have mentioned, You will find multiple firing rates on three and four section boilers { if cast iron} that will fall into proper Net BTU Water. Go with Heat load of House with or without domestic hot water added.
    Old school go a size biger zust in case. This is a NO NO.

  5. #31
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    Jan 2004
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    Lancaster PA
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    I saw the advertisement on the heatmanager, but it seems like just a timer, with no reset ability.
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  6. #32
    Join Date
    Jan 2005
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    How much do resets save

    I installed a BB heating system in my house. 81% cast iron boiler,about 1800 sq ft poor insulation. Installed Tekmar 260 controller with outdoor reset, dropped haeting bill 25% in one month of use, Im sold on installing Outdoor reset on boiler installs.

  7. #33
    A reset function is one of the most energy efficeint that you can add to a system, done properly and controlled by a PID loop it is the single most effective control you can spend money on to save energy. it is commonplace in larger systems.

  8. #34
    Join Date
    Jan 2002
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    1,196
    You can look at it this way: Spend the few hundred for reset now, and save fuel-whether it's 10% or 30% (mileage may vary depending on the human impulse to crank the thermostat).

    Or:


    Give your fuel supplier that few hundred EVERY year till you die.

    I think I'd rather keep the money

    Look at the side bennies: systems are quieter because expansion noises are minimized-pipes aren't getting shocked all the time with 180 degree water. House temps are more even and comfortable. You are reducing the already low pickup losses from piping even more, etc.

  9. #35
    Join Date
    Aug 2002
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    391
    The out side reset systems I looked at were very pricey in the $XXX range. Is there a more affordable unit I should consider. The concept made sense to me because it elimiates temperature spikes.

    (No pricing, due to site rules )

    [Edited by jultzya on 10-29-2005 at 02:10 AM]
    The obvious is obvious

  10. #36
    Join Date
    Jan 2005
    Posts
    99
    There are some variables. Modulating boiler ,atmospheric,primary/secondary. It depends on the type of system you have or want. XXX sounds high,for some decent fuel savings it seems you could get by with something a little less. Regardless, check your options Tekmar has always been very helpful and have stood the test of time.

    [Edited by jultzya on 10-29-2005 at 02:12 AM]

  11. #37
    Join Date
    Feb 2005
    Location
    MA
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    I don't mean to be a PITA, but has anyone noticed that jrc appears to be a contractor? He seems eager to learn (always a good thing) but the questions he's asking are basic and I for one would not want to be his first installation unless accompanied by an experienced co-worker.

    P.S. - Use I-B-R rating for retrofit and/or DHW applications. Extra 15% will account for most discrepancies in heat calc. Reset controls are worthwhile but proper near boiler piping must protect boiler from thermal shock.

  12. #38
    Join Date
    Aug 2002
    Posts
    391
    Hey ps not that I feel that I have to explain myself to you or anybody else, but I am not a contractor, I wish I was. I service AC and oil heat systems due to a medical situation that prevents me from heavy work. That being said I have some people (friends) who ask for a boiler install and if they can lug the boiler into their house I will do the piping and electrical.
    Why do I ask, because the vast majority of AC and heating installs that I see doing service leave a lot to be desired and I find the information here very interesting and
    helpful.
    When I put a system in I read the instructions that come with it and that is how I install them because I think the people who design the system might know what is right. I just wanted to know if I was going to waste this guy’s money on a larger system that was limited by the baseboard btu out put.

    So do not worry about me, worry about yourself and please do not take it personal. (BTW ps how many installs have you done?)

    [Edited by jrc2905 on 02-17-2005 at 01:15 PM]
    The obvious is obvious

  13. #39
    Join Date
    Feb 2005
    Location
    MA
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    jrc - I won't take anything personal and I hope you don't either. I wasn't trying to discredit you, only trying to understand.
    I agree that there are a lot of systems installed that are less than optimal - and I actually give (gave) you credit for trying to get as much info as possible. Good luck with your friends' job.

    BTW - There are also good forums re boilers and HW systems at Heatinghelp.com and boilerroom.com.

    P.S. - I have been in the business for 15+ years and haven't kept count. It really wasn't personal, I am always concerned with quality installations and the reputation of the industry in the eyes of the public - something you seem to understand, also.

    [Edited by ps on 02-17-2005 at 01:26 PM]

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