I would add reflective foam board insulation to the top and sides of that compartment before I’d try wrapping the water heater, but that’s just me.
I replaced same heater with instant water heater. So much better never run out of hot water.
I have not, but if you’re going to try and jury-rig insulation, don’t use anything remotely flammable, just in case the heater fails in some way.
Whatever you do make it temporary. You’ll appreciate the heat when it’s cold and you’re camping in shoulder seasons..
Would a standard water heater blanket, cut down to size, help any?


