Originally Posted by TXiceman
Depends on how cold it is outside...
Oh and it will last until it is empty.....
I nominate this for the best answer!!!
In fact, I truly can not tell you more than that. IF it's 10 degrees out it won't last as long as if it's 30, and if the wind is blowing doing the speed limit (55mph) it won't last as long as if it's calm. How much sun hits the house (Motor home) makes a difference too. All these, however are summed up above by "how cold"
And as someone else said how well insulated, (and how tight) the MH is.
The only way to be sure.. is to fill it, and mark your calendar, and wait for it to NOT heat.
Now: a suggestion:
Get an "Extend-a-stay" or equal (I think CW is currently selling one called a "Stay-A-While" by Mr. Heater, may well be same thing different paint job), Put it on, This is a brass assembly that goes between your on-board tank and your regulator.. It comes with a 10' "Extension" hose so you can use your on-board tank (Via it's "Quick Disconnect" fitting, this looks like the top of one of those disposable bottles) to run your Grill or whatever. It also comes with a 5' hose that hooks to a portable 20 pounder and to the Extend-a-stay.. It has check valves and other safety features to protect you from accidently filling one tank from the other and such. Get a portable tank and that way when (not if) the big tank goes dry.... You are at least good till morning.. I've run 2 nights at around 30 degrees on a 5 gallon bottle.