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two building plumbing

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by red dog, Dec 25, 2012.

  1. red dog

    red dog New Member

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    merry christmas everyone. this is my first post so dont beat me up to bad. need some help. First this is what ive got. 1500 sqf home with a 140,000 btu crown NG boiler all base board heat. im building a 2200 sqf detached garage which will have two floors first floor radiant in slab and second radiant stapled up under floor. what i would like to do is supply both buildings with my Greenwood 100 that is in a shed about 30 feet from the house.I plan on using a 50 plate heat exchanger with a wraparound pump to NG boiler loop in the house. im completely new to wood boilers so plubming , pump sizes etc will be needed. I was thinking about using a 80,000 BTU hot water heater in the garage as a backup to the radiant and for DHW in garage. The garage will be 100 feet away from house. Greenwood says that the 100 model needs 1.25 lines at 10 gpm. Most of the time wood boiler will be on except when we go away on weekends .I'm in upstate NY. ANY HELP WILL BE GREAT. Thank you.

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  2. flyingcow

    flyingcow Minister of Fire

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    Can't help you a whole lot, just bump this up.

    But how many BTU's is the greenwood?Not sure if it's big enough to do all the buildings. But I am not in the heating business. Just thinking out loud.

    You're NG is 140,000. Which as far as btu's go it seems to me it's big enough. My house has a 80,000 btu furnace(oil) and it heats my 1800sq/ft 2 story house up here in Maine just fine. it runs steady in january but keeps up.

    Also, if you use pex for your underground, make sure it's a true 1.25 inch ID. They can vary. I bought 1.25 Thermpex and it's a shade above 1 inch ID. Alright for my heat load.

    Good luck. Should get some replies. Welcome to hearth. Good bunch here.
  3. red dog

    red dog New Member

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  4. red dog

    red dog New Member

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    Thanks for the help the greenwood is 100,000 btu. Greenwood says it will do 4000sqf . Need to do heat loss cal house is not insulated well but garage will be completely spray foamed.
  5. flyingcow

    flyingcow Minister of Fire

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    What region you live in?
  6. red dog

    red dog New Member

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    I'm in upstate new York about hour and a half north of new York city
  7. flyingcow

    flyingcow Minister of Fire

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    The statement from Greenwood makes me pause. If i had a 4000sq/ft house up here, insulated like mine is(R-16 walls/R-40? ceiling) the greenwood would not handle it. Based on the 100,000btu unit.
  8. BoilerMan

    BoilerMan Minister of Fire

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    The genaric "will heat XXXX square feet" on pellet stoves, wood stoves, and wood boilers/furnaces, is quite a ploy IMO. Like FC said, there are many more factors to be considered, heating degree days, insulation, infilteration, type of windows, solar heat gain, etc etc.
    It really gets my goose with the electric heaters and their stupid claims like Eden Pure and others, Heats up to 1,500 square feet..... Um it's 1,500 watts and all resistance electric heaters are 100% efficient oh I digress.

    TS
  9. red dog

    red dog New Member

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    thanks for the info
  10. JP11

    JP11 Minister of Fire

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    Yes.. ignore what they say for SF heating. Take their BTU claim and subtract a bit just to be safe.

    Figure out what you're really using for heat in your current building, and get a good guess for the new building. Trust all of us when we say... PLAN, read, PLAN some more. Start cutting wood NOW. Or buy some that is green. Dry wood makes your life easier.

    Once you have a heat load. Then you can figure a budget and then start planning a system. Don't be stuck on any one brand. Read around here... MANY ways to skin a cat.

    JP

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