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wood boiler safety

Can anyone answer the question.....when the power goes out my Greenwood Boiler continues to heat the water because of the ceramic thermal mass and then since there is no circulation the water/antifreeze boils . If I can catch it quickly then my generator is hooked up to pump the water and all is OK , however, if not then I have problems. Can a convection run away lane bank of finned radiators work to disperse enough heat?


  • SWEISWEI Member Posts: 7,356
    There's quite a bit of mass

    in that refractory.  You'd have to ask Greenwood for some estimate of what it can store.

    A tank of water can absorb more heat more quickly than any common radiator will.
  • NRT_RobNRT_Rob Member Posts: 1,009
    the industry standard

    is a generously sized pipe, piped such that flow can exit the boiler without power (directly up from the boiler, gravity recirc), to a bank of fin tube convectors sized for 15% of the boiler's rating. it should be sloped down to assist the circulation.

    I don't know if this works with the greenwood, per se, and you should check with them. checking their website I don't think they even do this style boiler anymore, do they? the frontier they sell now appears to be a different design.
    Rob Brown
    Designer for Rockport Mechanical
    in beautiful Rockport Maine.
  • Big_gBig_g Member Posts: 2

    Thank you for your thoughtful input. Greenwood kind of  dropped off the map after I purchased the Hydronic boiler and most Tech support also dropped off. The service tech fellow tried but I figured Greenwood was having more than cash flow problems and that maybe that product was not researched enough before it was put on the market. I worked with different styles of hot water  heat in our school system and was able to collect 40ft. of 1 inch finned tubes from school radiators. Thought they might work for this application. Another answer to posted question suggested a water tank would disperse heat efficiently also. sounds good also.
  • Karl_NorthwindKarl_Northwind Member Posts: 140
    good advice

    The above are good advice, I'll also recommend posting solid fuel questions on's boiler room.

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