Join Date: Apr 2009
Location: Mold, North Wales
My Motorhome: Auto-Sleeper Sussex Duo
Thanked 26 Times in 26 Posts
The water heater is called Ultrastor and the room heater is the Ultraheat. As the OP mentioned putting fan blower on and opening vents, I assume they are talking room heater. On the thermostat you should be able to select 500w, 1000w or 2000w , have you tried it on a lower wattage setting?