[Greenbuilding] STSS - was "heat pump advice"

[Nick Pine]

"David Delaney" <ddelaney at sympatico.ca> writes:

> Well, after googling for this new tank material, STSS, I 
> find that STSS refers to Sven Tjernagel Solar Systems. 

In Mechanicsburg, PA.

> Apparently Mr.  Tjernagel used to construct storage tanks 
> for large amounts of solar heated water by folding a single piece of 
> EPDM roofing material into a plywood box, or a steel 
> cylinder -- a culvert section on end, for example.

Those tanks were site-built, so they could not be UL-approved.
Sven's latest tanks are small circular swimming pools, eg a 4' tall
x 7' diameter tank with an EPDM liner inside polyurethane insulation 
inside a sheet aluminum cylinder. They are squeezed in a crate into 
an oval for shipping and moving through basement doors. He also
sells very nice soft copper pipe coils for DHW.

As you say, for many years Sven also made large EPDM rubber 
bladder solar water heating collectors. He's full of practical solar
house heating advice, like "never make hot water downhill, because
it cavitates in the pipes and sounds like rats in the walls."

Nick