1) Thermal mass: Hydronic systems rely on a thermal mass which they heat
up. Once the mass is warm it is easier to keep it warm. I think you would
find it difficult to duplicate a thermal mass on the floor of you van.
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Why not just add a heater core from some vehicle?
That way all you need is a fan blowing across it and some source that
produces the BTU.
All these sandwich floors are great if you've got an acre to work with
but my Westy floor is about 4" x 4" and I don't want it elevated or
plumbed.
The real problem with heating the Westy is just like the Refrigerator,
everytime you open the door the heat falls out, with the Refeigerator its
the cold that fals out .................. recovery has to be fast and
predictable.

Stan Wilder

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