[bushpilot]

must be why the MFG's don't insulate there either (you can see the strips on our coach on humid mornings).

Some places are probably left better un-insulated or stuffed with pink stuff (vapor barrier / moisture may be of concern)....maybe sheets of blue foam/foil backed foam core might be better/easier.

I worry that foam stuff expands so much that it could push things out of joint.

Be interesting to hear about the on demand heater - 60k BTU's is a lot. id be curious about the propane consumption, does it have an electric option?

Plumber friend of mine hates the (residential) on demand - he thinks they consume more GAS - since they have to have such strong heaters and they need to fire up (waisting water) before you see hot water at the tap.

Our 10g is more than enough for several people (back to back / boat showers) and its consumption for propane is minimal (we use the electric source when on shore power, so consumption of gas is further reduced).