I don't think I have ever seen you say what failed in the pump end. Hot
water is hot water heated with diesel or propane. All systems have a check
valve to hold pressure against the pump. This is what controls the pressure
system. Without this check valve pressure would bleed back and the pump
would start and build pressure then shut down, much as if the system had a
leak down stream of the pump. The pressure tank is just a wide spot in the
system that holds the "energy" expended by the pump and to reduce cycling.
Again, I ask, what failed?
Thanks,
Don Leith
> Gary,
> Shurflo warranty's their high end Smart Sensor pumps for 3 years. They
> were experiencing a excessive failure rate of damage to the internal pump
> from back flow pressure. They do not recommend the need for using a
> accumulator tank with that pump. Their studies and testings found that
> that the the pumps that failed came off RV's with hot water heaters as
> opposed to RV's that were equipped with Aqua/Hydro hot systems. Because
> of replacing pumps under warranty, Shurflo had to either quit making the
> Smart Sensor pumps or correct the situation be redesign. They chose the
> latter. I had several discussions withn their engineers on the phone and
> at the last FMCA International rally. That is their answer.
> Therefore it appears that you are shooting from the hip trying to make
> your point. Chuck B
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