profdant139 wrote:
OK --time2roll's advice is always pretty darn good, so let's rethink this. It looks like Gordon's ultra quiet brushless pump might be an option -- I am not sure how that would work without triggering my noisy main pump? Or Gordon, did you completely replace your stock pump with the brushless one??
The way I'd do it is to turn the main pump off when using the circulation system, open the circulation valve, and have the quiet little circulation pump switched on and off thermostatically as needed--or, maybe, on a variable timer or something like that, depending on the situation.
Replacing the main pump would be tricky because most of the quiet pumps around are not automatic on-demand pumps with pressure switches and do not incorporate check valves. I suspect many would also have a hard time producing typical household water pressures, being more optimized for low-pressure circulation flow. There are, of course, many different types and styles and sizes of pumps, with corresponding wide variations in pressure and flow rate capacities.
If you used the main pump, you'd have to have some sort of a solenoid valve or similar to control its operation, assuming you didn't want it to run continually...or, I suppose, control the power feed to it while en route.
