It's really cold here-Brrrrr..

[Jim-n-Kathy]

Well thank you all for answering our questions about supplemental heating devices. We settled in on a Pelonis ceramic. It is small but puts out incredible amounts of heat. Camping world price was about 79.00. So, with heater in hand and full propane tanks we headed off this morning departing from Folsom, CA. As I type this we are settled in Elco, NV. It is 10 PM and our furnace is cycling every 6 minutes or so [set at 68 degrees]. The new ceramic heater is on full bore. The overnight temp here is being predicted [by local weather channel] as dropping to 1 degree! so we have some urgent questions;
1. we did hook to the campground water supply and used water out of several faucets. And then for safety as we ready for bed, I unhooked the outside water supply and drained the hose [plan to hook it back up in the morn]. Our on board fresh tanks are totally empty. Our grey tanks have a few gallons. Do we have to worry about the Monty plumbing freezing this evening? We are headed for Salt Lake tomorrow and it will still be cold but in the 20's and 30's [little better].
The other question is that if I have both the R and L propane bottle valves open and if one bottle runs out overnight-will the other bottle continue interupted supply [without me getting up and turning the selector valve to the other bottle]? I know, you would think I would know this already. Too much warm weather camping [and imagine that -I grew up in Sault Ste. Marie, Michigan!!

Thanks
Jim-n-Kathy and Sami the covered up [tonight] Lab