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IT WORKED.

thanks for the help, will install nrv tonight. Have heard before that this problem goes away sometimes when in regular use, so i suppose it could be trapped air, although i have tried many times to thoroughly bleed the system. thanks again

had another idea suggested to me that seems logical. when the hot water is being drawn from the s flange to the DHW, this could be pulling water out from the shower feed slightly. When the DHW tap is shut off, the shower pipe reprimes thus bliping the pump on. If this is logical then i suppose...

could iso valve cause this problem??

kln

yes, and with it isolated the problem goes away.

does a inline valve exist that only opens when the pressue is high enough,ie greater than the blip that brings in the pump for that second(proportinal vale??)?

taps are from top of s flange.to dhw pipe with vent. pump is from tee off s flange.

Hi taps in the house are causing a pressure difference in the system causing my new shower pump to cut in for a second. i have tried nrv at taps with no luck. has anyone any other ideas. the system is a gravity fed indirect

as i thought thanks. is there a solution to this other than turning taps of more slowely as they are lever mixers that you naturally tend to press quickly. Did thinks that the s flange should have overcome any surges, but obviously not. thanks

have a newly installed shower pump along with larger tank cyl etc. My system is indirect gravity. used s flange all works fine except that when i turn off the hot taps to sinks etc quickly the pump blips on for a second, as if the pump is seeing a short flow. any ideas as to the prob thanks