The costs of operating the electrical heater are minimal for a couple of reasons. First, the unit operates on efficient 220 volt electric and draws less than 40 amps of power. Second, unlike a spa or other household appliance, the heater only draws power when you want to use it. You turn on the heater no more than an hour or so before you want to use it and then shut it off when you’re finished. The costs of operation are negligible under normal use, much like the cost of a clothes dryer or electric oven.