Inline water heater

[Hutch]

The Aqua roll always freezes from the top down, we have to fill it up before it gets too chilled.

 

[ProfJohnL]

Also worth placing the aquaroll off the ground, wood etc for further insulation

The ground often retains more heat than the air above it, so if it's not frosty during the day, then leaving the water container on the ground may allow it to keep a little warmer by drawing heat from the ground.

If the ground is all ready frosty, then the water container should be insulated from the ground, but not exposed to the air

Mmmm. Hence the Christmas Carol, In The Bleak Mid Winter B)
Actually Prof, any insulation in the winter is as we agree essential

Except around gas bottles!