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Another thing about the Combi. With a periodic maintenance required with a refill of some fluid reservoir, probably ammonia, it reminds me too much of the DEF tank on newer diesels. We only use our heater when getting out of the sack in the A.M. and only for a short period of time before the coffee pot takes its place. The last little while we’ve been using a small 3500 btu propane bottle portable catalytic heat maker on the floor near the door of the TC. As long as it’s above, say, 20 deg. F, it works out. Below that, all bets are off. jefe

2020 Ford F-350 XLT FX4 4WD SRW SB SC 7.3L Godzilla Gas TorqShift 10R140 397 amps dual Alt dual batts Frnt Dana 60; Rr Dana M275 E-locker 4.30's 4580/4320/4066# payload 7243# curb wt. 11,300# GVWR 5-er prepped. 2020 Northstar Laredo SC, 12v compressor fridge, cassette, 320w Solar sub zero insulation.