I have one of these on my 5 gallon scepter can and it works great Facon 12" x 18" RV Tank Heater Pad, CW-T1218, Use with Up to 50 Gallons Fresh Water/Grey Water/Black Water Tank, with Automatic Thermostat Control, 12Volts DC Amazon.com
wondering the same thing. I fill up my french before I go to bed just so I have water for coffee in the morning. it can freeze but it just means it takes longer to boil it to make coffee. learnt that trick the annoying way
might need to get that heater pad… wonder if it would work with lithium batteries too… how much amperage do they pull?
I’m not much of a winter camper. Why not just get a small cooler like an igloo 6 pack size (or something like that), and pre-heat morning coffee water at bedtime? Its doesn’t have to be boiling, just warm. Store in a container that fits in the cooler and has a closable lid. Then dispense said water into your choice of coffee solutions in the morning…
A dedicated small warm cooler is how I think I’d attack this issue. Seems simple and straightforward without involving more gear and such. I’m a simpleton, though.
If 6 gallons of water is freezing inside the camper, its freakin’ cold, btw… And even if you keep the water from freezing, heating up that water may drain your cooking fuel more than you want if the water is just above freezing in the morning.
I camp when it is damn cold a lot, the warm cooler is an option but just sticking a heater on the tank has been much less cumbersome as I don’t have to have anything other than the water can that I always have with me anyhow. It has a thermostat and I honestly don’t even unplug it in the summer just let it do it’s thing.
I put water, eggs, and any other liquids that I don’t want freezing into the normal cooler with my food/ice. The ice keeps it cold (obviously) but the insulation of the cooler maintains a fairly constant temperature compared to outside. If it’s going to be really cold I’ll just pour a gallon or so of water instead of ice into the bottom of the cooler and it has the same stabilizing effect. I camp fairly often with overnight lows in single digits / low teens and have never had an issue with things inside the cooler freezing up.
Here’s my idea, I used the dual layer reflectix bag a couple weeks ago in Vermont but I didn’t have the heat pads yet; temps got down to 15F/-9.5C at night. There are two bags, one inside the other, sewed with my sailrite lsz1. For heat, I just boiled water, poured it into some double walled stainless containers, and put them in the bag next to the 7 gallon jug like old timey hot water bottles. Worked fine, reboiled once a day at dinner time. I don’t leave the siphon pump in place when storing, I take it out, so the bag seals up nicely.
The heater pads are these, https://a.co/d/bgtlK4u , taped to 16 gauge steel plate I cut to shape. I wanted the metal plate to avoid any chance of melting plastic. I’m using the cigarette plug port I normally use for my dometic fridge in warmer months. The heat pads together draw anywhere from 0.2 amps @ 12volts to 1amp, depends on how cold it is. I’ve got a 200amp hour battery bank, so running them 24/7 when Winter camping won’t a problem. I had leftover reflectix from a previous home remodeling project, and leftover wiring/parts from my GFC build. If you don’t have any of that, this may cost $100-150, assuming you have a sewing machine.