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    Using a Raypak E3T to heat 650 gallon hot tub in texas

    Hello, I'm was looking for non bias (or experience) on efficiencies of using a RayPak E3T (the 92 MBTU/h one) for a hot tub with about 650 gallons in terms of: -- heating water temp = I saw in the forms that someone had said: 8 degrees an hour? -- cost using electricity to heat water with this...