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FIXED ! A brief update now that we've had a working fix for a couple/three months. We got in another local company who went through the issue & all the items documented here, agreed that the issue was a build-up of pressure between the three-port valve & the safety two-port for the HW tank...

Couple/three other things which we’ve considered: * Is there an Integrated Flow Check valve in the Wilo Pico pump that might allow a pressure difference - No evidence the PICO pump has such a device; plus hard to see how it would have this effect * Might the pump benefit from a run of the...

Yes, that’s the cream one to assist the Megaflo. The original on the heating side was red (which makes sense) got replaced with the gray one (less so). It is, as per IMG_1488, there’s big 22mm t-off from the cold feed to the Megaflo after the pressure control unit. Glad that aligns with...