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Many thanks for your knowledge and time gentlemen. It is most appreciated. Kind Regards. Rich

I actually recall Ideal giving away Isar HE boilers, In the hope that plumbers would fit them. Like a clown, I fitted one in my house. They were prone initially to firing up for no reason on dhw. I believe that they rectified this fault, but kept the problem under cover, so as not to tarnish...

Sorry for using your poster name, But would be ever so grateful if you could help me out. I have had an Ideal Isar for a few years now, and experienced the problems of the "firing up without demand for domestic hot water", Ideal did infact correct this. Prior to my PCB going down, I believe...

gas4you, I am Impressed with your knowledge of ideal boilers. I assume that you are a breakdown engineer across most manufacturers. Yes I too have an ideal isar, HE, and fitted the boiler prior to the law of installing condensing boilers. The Isar's had fundermental problems, and I believed...

Hello Pbpeter, If the pressure vessel Is at fault, then as leedsplumber said, It may just be a question of re-pressurising. If the diaphram in the expansion vessel has ruptured, then a new expansion vessel will be required. Any chance of a picture, they speak a thousand words !!, or so they...