Figuring gas cost for heater

Aquaman7

Well-known member
Sep 15, 2019
371
NJ
Hello,
I’m considering buying a 400k master temp heater. Out of curiosity I would like to know how much it would cost in gas per hour to run the heater. Is it true that 1000 BTU is equal to 1 therm of gas? Where I live in New Jersey it cost $.79 per therm which includes the supply and delivery charges. Is it realistic to say that to figure out the gas cost I would multiply 400 x $.79 which will give me the hourly rate? 400x.79 = 3.16 p/hour.
I’ll also need this calculation to figure out the cost to run 2 fire bowls at 65k BTU’s each.
Thanks everyone for your help.
 

ajw22

Gold Supporter
TFP Guide
Jul 21, 2013
24,619
Northern NJ
Pool Size
35000
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Plaster
Chlorine
Salt Water Generator
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Pentair Intellichlor IC-60
I think you have some typos in what you wrote but get to the correct answer.

1 Therm = 99,976.13 BTU = round up to 100,000 BTU

Running your 400K heater is 4X.79= $3.16/hour
 
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JamesW

TFP Expert
Mar 2, 2011
23,856
I was just thinking, don’t I have to deduct for the efficiency of the heater?
A 400,000 btu/hr heater uses 4 therms per hour regardless of the efficiency.

The efficiency only tells you how much of the heat transfers to the water.

The gas company does not care how efficient your heater is.

They only care how much gas you use.
 

homegameroom

Bronze Supporter
Sep 23, 2015
294
Sunrise,FL
Here is a spiffy calculator (spreadsheet) to help you figure out the cost:
 
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