I can fill my van tank direct from the house hot tap via my DI. I was thinking of building a plywood box to fit the tank in, but....the box will be 4 inches oversize all around with a hole cut out for the lid. I intend to then fill the space between the tank and the box with foam insulating, like the house cavity stuff. I think this will help keep my water warm all day long. Can anyone add to this or see any downside?
Cheers