So in NH I am paying just over $4.20 a gallon for propane and about $0.18 a kwh for electricity. With those prices a propane heater for my hot tub would cost mo

So in NH I am paying just over $4.20 a gallon for propane and about $0.18 a kwh for electricity. With those prices a propane heater for my hot tub would cost more to run. Also a heat pump heater for the hot tub would optimistically get around a 3-4 COP in warmer weather and 2-3 in the colder weather but either of those would lower your price to heat it considerably but the capital expenses neglect those savings. Source: https://www.amsenergy.com/fuel-cost-calculator/ https://www.amsenergy.com/fuel-cost-calculator/