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Standby losses out the chimney

New2heating
New2heating Member Posts: 1
in Oil Heating
Does anyone know of how I would figure out how many BTU's are going up the chimney when my boiler is on standby?  I have a Weil McClain set at 150 to 170 degrees.  Thanks!

Comments

  • heatpro02920
    heatpro02920 Member Posts: 991
    I normally

    call a chimney vented appliance with no outside air intake 5-10% energy loss, that is just what I notice going from natural draft to direct sidewall vent...
  • Robert O'Brien
    Robert O'Brien Member Posts: 3,569
    Math

    Figure out the amount of energy stored at 170 and the amount stored at 150(don't forget the differential). The difference is standby loss assuming no intervening demand. Water has a specific gravity of 1,cast iron is .09
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  • chapchap70
    chapchap70 Member Posts: 139
    Here's a file

    We have a Peerless 3 section with a tankless coil at our house.  I turned the boiler off and took temperature readings a couple of years ago.  I made a spreadsheet converting gallons to BTU's, etc.



    The direct and indirect numbers assume 6 to 8 degrees per hour and 1/2 to 1 degree per hour idle loss respectively.  It's been a while. 



    Have fun.
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