> When I was switching the lines I did not notice anything
> in the pipes but
> then I really wasn't looking for anything.
"Heat traps" can be check valves, but normally they are just pipe. The idea
is just that you form a U-bend (kind of like a sewer trap), to help
interrupt circulation within the pipes due to convection. Eg,
http://tinyurl.com/36xh656
My guess would be that the builder left out the dielectric unions at the
heater connections. I would pull apart the heat trap on the outlet side,
and check for pipes clogged with galvanic corrosion. If that's what you
find, replace the pipe along with a dielectric union.
You should also check whether the builder used the water pipes for safety
ground. If so, my suggestion would be to wire the grounds directly to a
ground rod and not use water pipe. If that isn't feasible, at least make
sure they aren't tied into the hot water pipes.
-- Randall
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