Not certain why this tread is so long lived...if you leave water in your system and it goes seriously cold [single digits or lower] then something will freeze and or break...
I routinely camp in below zero while skiing...no water in system...7 gallon jug for water inside with me...no catalytic heater since all combustion produces CO and I am adverse to that ....good down sleeping bag and with my solar panels and LiPO4 BB heated battery I always have power and propane to keep the heater going inside if needed or in AM to heat up my ski boots..
Look you can add insulation panels/boards/sheets [I have] "until hell freezes over" and a FWC is impossible to add truly effective insulation to in near zero conditions or even prolonged single digit temps...just will not happen.
When possible I use two hedges; a small plug in AC cube electric heater if power box is available at ski area. Backcountry I sometimes need to run DC/DC power to bring the BB charge up due to snow on panels or clouds.. tedious to brush snow off top, but often necessary...
Again, this is not rocket science and I wish there was a simplistic one-size-fits-all way to prevent our water systems from freezing in severe cold...ain't going to happen....enjoy what we have, beat the hell out of a tent....
Phil
Least you forget, PG antifreeze kills cats...be careful where you drain your system..only water in our system.
Edited by Wallowa, 11 November 2023 - 03:52 PM.