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Hi it's a 618 not a 637 , I am sure it makes little difference. I am interested in what you would have had to have installed at the time of installation when we just had wall stats and basic timers

Hi ,i have a eco tec plus system boiler, a 637 i think , it is 12 yo ,still going strong. As fuel prices have gone up i want to try and use the boiler more efficiently . It has always been set to run hot water and the heating at 65degrees . I set the hot water to 65 using the dials under the...