The villa we have stayed in a few times now has an electric heater, the first day we got there 17th October this year the pool seemed cold and didn't really warm up for a few days, the pool man came and turnned the thermostat to Full, as the weather was cold ish it didn't really heat up, but then 2 days of Sun and the pool was unbearably hot, hotter than a bath, when I jumped in I thought i had burnt myself, it took 2 days to cool and it burnt off all the chemicals, when you looked out at night the pool area was just a mist.
It was nice around midnight though to have a sit in the shallow end and relax!
Never had a gas heater so can't comment!
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