We have 2 of these (1500W ea.) that I got on sale about 3 years ago.
Heaters Less than $20 each. We run these in Alaska unless temps are well below freezing and DO NOT have dedicated circuits, although each heater is on a separate circuit breaker protected circuit. In addition DW has a very small under desk type electric heater for the small half bath. In addition, we run a glove and boot drier when necessary.
Boot drier. Have never popped a CB and when temps get very cold the standard rear LP heat takes care of the underdeck and tanks along with a 100W incandescent bulb in the wet bay.