I have a pool, roughly 35000 gallons, and I was thinking about putting a spa heater on it. I am not trying to heat it to 92 degrees, rather than just grab a 5 degree increase to get it over the 79 to 80 degree threshold that takes forever due to not a lot of hours in direct sunlight daily. and I am not planning on heating around the clock. just when the pool will be in use. other words I am not wanting to sink a lot of money in a heater.