My TT is 30A and came with the fireplace option. I've been driveway camping the past couple weeks and run the fireplace at night. We've still had some nights where temps drop into the high 30's and the furnace comes on occasionally to assist the fireplace but not as much as it would without. I can see by my EMS-HW30C that amp draw varies between 10-16A depending on other devices I have turned on. I am plugged into a 30A pedestal. If the OP's trailer is connected to a 15 or 20A pedestal he may trip a breaker at times but I have not on my 30A dedicated circuit.