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Maybe that is not what "combi" means
Where your boiler has three pipes plumbed in for gas and heating flow and heating return, as a closed loop system exchanging the heat to radiators or a heating coil. A combi(nation) boiler would also have cold water feed and hot water out as directly heated water. Probably plus condensate and overflow pipes too.
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user69121
Right.
Back to basics.
I know fuck all about this.
So, it is possible I don't know what combi means!
What I mean is that my hot water is heated by the gas flame, not immersion coil. When everything is working fine. Maybe that is not what "combi" means.
Happy to be corrected.