I live in Toronto, Canada and would like this year to heat my swimming
pool.I'll buy solar blanket to keep heat in. But I still have a question -
is it better to put thermostat on set temperature and leave it like that for
whole summer, or it is better to turn heating off for night? Will I use more
gas to keep constant temperature? What temperature would you recommend to
keep pool at?
There would be little or nothing to gain by turning it off at night, and
you may loose function as you would need a larger heater if it was only
allowed to function during the day. (I am assuming you are not using a
Now if you are going to be away for a few weeks, then that would be
Down here in California the heater runs when the pump is on which is only
about 6 hours a day. That should be enough both to keep the water clear and
heated too. I set the timer to run in the day so noise does not bother
Turning the heat off at night could save energy. A 24'x32'x6' 70 F pool in
60 F air with an R1 cover would lose about 16h(70-60)24x32/R1 = 115.2K Btu
over 16 hours. With no heat, and thermal mass C = 24x32x6x64 Btu/F, it would
cool to 70-115.2K/C = 69.22 F, with an average 69.61 temp and an energy
savings of about 115.2K-16h(69.61-60)24x32/R1 = 2880 Btu/day, about 8 cents
per day, at 10 cents/kWh... in the shade.
But the 1981 NRC Solarium Workbook says 5375 Wh/m^2 (1704 Btu/ft^2) of sun
hits the ground on an average 12 C (54 F) May day. If 90% of that enters
a square foot of T (F) pool with R1 insulation, 0.9x1704 = 24h(T-54)1ft^2/R1
makes T = 118 F, with no extra heat :-)
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Run it as little duty cycle as possible to have it up to temperature when
you want to USE it; idle it at other times. This assumes you are extremely
wealthy. Pool heating is a luxury I suspect you can't afford anyway.
Thanks everyone for answers.
Thanks to your replies, I did realize that I am running pump just during the
day, so to heat pool overnight will require runnig a pump. Altough
NicksanSpam calculations shows that savings would be minimal, I still
decided to heat pool just as I need basis.
Thanks for all your help
I have found that it takes my pool heater approximately an hour to
raise my pool temperature one degree. Usually during swimming season
from late May until late September here in the Carolinas the Sun will
only get my pool temperature up to about 76 degrees due to the trees
in my yard shading the pool. So, I turn the heater on about 24 hours
before I plan on going swimming and this allows my propane gas heater
to get the pool up to that toasty 88 degree mark for swimming!
Last summer I made the mistake of just setting the thermostat on the
pool heater and leaving it running on autopilot for a few weeks
without putting a solar blanket over the pool. Whew...did I burn some
propane gas! That was an expensive lesson.
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