# Thread: Anyone help size of this oil furnace?

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I knew I was guessing wrong lol. Thank you for the 411. Thanks everyone for the help

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EXACTLY.

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Thanks Rovert. How did you find out it’s running at 90,000 btu’s? Check the specs on the burner along with nozzle size? Appreciate the education ���� THANKS

4. 139,000 times 0.65 Does Not Equal 65,000.

PHM
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divided
Originally Posted by Iceman_pdx
Yup .65 70 w and 100# pressure. Don’t tell me it’s 65,000. Back in the day I used to work on these, now we just take oil furnaces and switch to a different fuel, and back in the day I could remember shit lol. 3td one I’ve worked on in 10 years. Thanks everyone

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I'm with PHM on the formula for input BTUs, but in my area (I think oil furnaces in general) gas furnaces are rated in input, oil furnaces by output. So, multiply your nozzle size x 139,000 = input. Input x efficiency = output.

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.65 (65%) times 144,000 (btu's per gal) =93,600 Btu's per hour, if it was constantly firing.

7. You seem to have now joined me in feeling fully qualified to state the obvious. Yes; very few heating appliances produce heat - except during their on-cycle. <g>

So yes: "per hour of run time".

Oh! Is fuel oil actually 144,000 BTU's per gallon? What was I thinking of with the 139K number? Gasoline maybe? If so; I stand humbly corrected.

PHM
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Originally Posted by george3
.65 (65%) times 144,000 (btu's per gal) =93,600 Btu's per hour, if it was constantly firing.

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Originally Posted by Poodle Head Mikey

Oh! Is fuel oil actually 144,000 BTU's per gallon? What was I thinking of with the 139K number? Gasoline maybe? If so; I stand humbly corrected.

PHM
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I've always used 139,000.

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