I've got a 1500 watt (about 5100 BTU's) heater in my Scamp
16, and it will raise the temperature of my camper about 30 - 35 degrees above ambient. If this isn't enough, the 12,000 BTU propane furnace
will pump out the heat and warm the camper in any circumstance.
700 watts is about 2,400 BTU's. This will not be enough heat to keep you warm in your trailer in temperatures below freezing, but it will ease the load on your propane furnace
. For temperatures above 40 or 50 degrees (f) this heater should supply plenty of heat.
-- Dan Meyer