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Most modern condensing boilers don't condense very well after initial startup due to the return water being too hot, pump running too fast, boiler oversized etc. I have a 26 year old Kidd model 1, it was designed that the return flow was no more than 55C, so it condenses properly. I had a lot...

I've got a Kidd boiler. Mine kept going wrong, burner moter failing, gas valve solenoid failing, pump failing air, pressure switch, endless moter 3 times. I put a temperature logger on the blower moter & the case peaked at 130C. I kept telling Kidd but they didn't listen. so I fitted 20mm of...