Originally Posted by rracer5
Looking at the brochure for your model, it shows (and states) enclosed and heated underbelly. What kind of "heat" did you use last night........on board furnace or electric heaters? In a heated underbelly, heat is blown into the underbelly area when using the furnace and is necessary to keep the lines from freezing. This is usually enough to keep the lines from freezing, especially at only 30 degrees. Check the underbelly to see if there are any heat ducts laying in that area and check for gaps around the edges and seal them up with expandable foam insulation.
By now, if the temp outside has risen above freezing, the lines should thaw but, I would find out why they are freezing and soon because an extended freeze could cause burst lines.
This is correct. On our Sabre. It's advertised heated and enclosed underbelly/tanks. The problem is there really isn't any insulation below the pipes, is all above. Even with just the propane furnace running, we froze up all lines behind the basement storage bay until it warned up dramatically. I used a space heater and hair dryer, under the kitchen sink, to force hot air into the underbelly and was able to thaw the kitchen lines.
I plan to drop the whole underbelly cover and add 2" rigid foam with silver liner, below the pipes. I'll also make sure there's plenty of ways for heat to get to that area. I added a circuit and switch to power the furnace fan to blow the electric warm air into the belly too.