NH electric rates are $.20/kWh [1]. If you are spending $15/month for heating the hot tub, then you are consuming ($15/month)/($.20/kWh)=75kWh/month to heat i

NH electric rates are $.20/kWh [1]. If you are spending $15/month for heating the hot tub, then you are consuming ($15/month)/($.20/kWh)=75kWh/month to heat it. Assuming you are using are using a resistance heater (100% heating efficiency), to raise 200Gal of water (typical small hot tub size) from 50F to 100F requires about 25kWh of energy. To only use 75kWh/month (255kBTU), you would need to only raise it to 100F less than 3 times a month, and that assumes that the water temp doesn't naturally drop below 50F (unlikely in NH). It's likely you are spending significantly more than $15/month to heat it with electricity. Propane is about $30/MBTU, which would work out to about $9/month for the equivalent amount of heat. 1. https://www.electricrate.com/residential-rates/new-hampshire/ https://www.electricrate.com/residential-rates/new-hampshire... 2. https://bloglocation.com/art/water-heating-calculator-for-time-energy-power https://bloglocation.com/art/water-heating-calculator-for-ti...