I'm glad you found that website and article.
The Revcon set-up used a timer and it must have
been a trial-and-error deal to figure out how
long to run the pump for hot water at the tap.
I figure the timer had a set point on run time
and you just fooled with it until you got it right.
The 12-v solenoid was located in the
plumbing run as far away from the water heater
as was possible so it charged all the hot water
taps (faucets) in the run. Do not know if there
were push buttons at each hot water faucet in
the Coach, but it makes sense.
Glad that that you could see the benefit of this...
in so far as I know, there are no
units like it for sale in the market...