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Old 04-06-2010, 10:43 AM   #1
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Oil to gas conversion


Converting from an old oil boiler to a new high efficient gas boiler. I have 1900 square feet of living space, broken into 2 zones. How do I determine the number of btu's needed for the new gas boiler? Hank

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Old 04-06-2010, 01:48 PM   #2
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Oil to gas conversion


call a HVAC contractor. The calculations are too complex to not be using a computer program to figure this correctly. Too small or too big and you have issues and/or energy waste. Basically you need to measure the cubic feet of each room. then the sq. ft of each exterior wall. Then add the individual k values of the materials in the wall to get the net U-Value. Then total the R-value of the existing insulation by type/thickness/installation quality and deduct the inverse of the u_value X 25% to get net wall R-Value. Do you really want the rest of this?

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Old 04-06-2010, 03:40 PM   #3
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Oil to gas conversion


You can do your own load calc HVAC Calc its worth the 49 dollar fee to get the correct size boiler for your house.

This is presuming that you don't have a steam heating system. If steam, your boiler must be sized to your rads.
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