Question about Shurflo On Demand Diaphragm Pump 28 Gpm 12 Volt 12in Model 12021000

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Shurflo pump 20psi 2095-204-112, in motorhome runs normally when supplying wash hand basin with hot or cold, but when supplying hot or cold to kitchen sink the pump runs intermittently with very little pressure.

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Paul Beyer

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Take the aerator off the faucet and see if that makes it work better if yes clean the filter in the aerator on the kitchen faucet.

Posted on May 12, 2011


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In a word no. Combi boilers work on balanced the mains cold supply to the boiler should be around 1 bar minimum which would give a hot water pressure of the same 1 bar. Assuming the cold water pressure is fine, it sounds like you have a restricted flow on the hot side. If you live in an area with water problems the hot water systems pipework calcify over time effectively reducing water flow. Unless any flexi hoses are kinked, check if there are any filters in the appliances that may be blocked.Also check all valves are fully open and if possible check if there are any restrictions at the valves. Failing all that and the taps are in good order it is possible to fit a pump before the boiler but this may only be a temporary fix overall.

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