Gas heater a good option for smaller 9000 gallon pool?

Jun 14, 2021
16
Sacramento, CA
So I know heating a pool cost a lot, but If these calculations are within this range it might be ok.

I'm in northern california. our natural gas is provided by PG&E. I checked my bill and found that we pay $1.36 cents to $1.89 per therm, up from 92 cents – $1.40 in 2012. In addition, there is a 4 cents per therm surcharge for “PPP” (per my bill: Gas Public Purpose Program Surcharge: “Used to fund state-mandated gas assistance programs for low-income customers, energy-efficiency programs, and public-interest research and development.”)My calculations come out to $1.63 per therm plus the $.04 surcharge equals a gas cost of $1.67 per therm, on average. A 100,000 BTU heater uses 1 therm of natural gas per hour, so a 400,000 heater consumes 4 therms an hour. 4 therms an hour x $1.67 = $6.68 per hour. So the magic number based on the most common 400,000 BTU pool/ spa heater is $6.68 per hour in gas cost to run your heater. Keep in mind, we’re not talking about how long it takes but how much it costs. So I know heating a pool cost a lot, but If these calculations are within this range it might be ok.

My pool is 25 x 15 but Baja shelf is 5x8 so realistically swim area is I would estimate 21 x 15 and It's 3.5 to 6' deep.
Using this website Pool Heat Time Calculator

Raising from 60 degrees to 85 degrees and having solar cover. And purchasing a 300K BTU heater it would take 5 hrs. So about $40 to heat the pool. I feel I could live with that for special occasions,
 

HermanTX

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May 20, 2020
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Katy TX
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Your logic is fine and if it is one-time events, it is certainly worth the value. Having the solar cover helps. Where people fail is trying to keep it heated for a long time - weeks. I have heated my 15k gal pool in 15 hrs but my gas cost is much less.
 
Jun 14, 2021
16
Sacramento, CA
Your logic is fine and if it is one-time events, it is certainly worth the value. Having the solar cover helps. Where people fail is trying to keep it heated for a long time - weeks. I have heated my 15k gal pool in 15 hrs but my gas cost is much less.
thank you. I feel thats why I posted is to make sure my logic is fine and i make sense. Of course at first i never considered gas because of cost, but the more I thought about either a heat pump or solar heating on the roof, and more I read about it, I feel it wont get me where I want at least fast enough. And the latter 2 options wont be effective in winter months--it doesnt snow here but gets cold in the 50s-60s (thats what we consider cold here).
 
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AZAA

Silver Supporter
Apr 9, 2020
114
Gold Canyon AZ
Pool Size
12000
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I had a Heliocol rooftop heater for 3 years here in south/central Arizona. It just couldn't keep up during December through about February so I had considered a gas heater to augment the solar. I never got around to it and now I have a pool heated solely with gas. It's expensive. I miss my solar heater but adding one now just doesn't pencil out. Having both would be the perfect solution, but you'd just have to "do the math".
 
Jun 14, 2021
16
Sacramento, CA
I had a Heliocol rooftop heater for 3 years here in south/central Arizona. It just couldn't keep up during December through about February so I had considered a gas heater to augment the solar. I never got around to it and now I have a pool heated solely with gas. It's expensive. I miss my solar heater but adding one now just doesn't pencil out. Having both would be the perfect solution, but you'd just have to "do the math".
yea before I did my own math and checking gas rates, its just the common notion that when you talk about gas to heat a pool its just so outrageous why even do it, but as mentioned in my original post, if my estimates are correct for my size pool, it should only be $40--lets even say $50 to heat it for a day's use. I dont see myself having to consistently keep the pool hot during the winter months to make it cost a fortune. I probably would average 1 day a month of heating it or if there is a special occasion and people want to "chip in" to pay to heat it that day lol. I already have electrical and gas lines ran and ready for either a heat pump or gas heater, and i was almost sold on heat pump from the start but im glad i dug further as this might be better for my situation
 
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