currently, in these wonderful days we live in, we have these choices:

-stock plastic
-stainless steel ( a few vendors)
-rubber hose (ie marine coolant lines)
-aluminium (rocky mountain west)

Not a bad selection.

alistair

On 8-Mar-11, at 7:47 AM, mcneely4@COX.NET wrote:

> Thanks Alistair.  I did do some additional checking.  the 180 F
> maximum temperature rating is enough, as the control temperature for
> the waterboxer exceeds that, and certainly excursions occur under
> some conditions. Thermal expansion of length might be enough to be a
> problem, also, given the length of the pipes.
>
> mcneely