Hot water only when heating is on - Vokera Excell SP80
- Thread starter refche
- Start date
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Perhaps I could be a bit more helpful. First thing to get checked is the domestic hot water diaphragm. If you are not confident then a good repairman should be able to repair your boiler.
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I replace the diaphragm at the third year when engaged to service a boiler anually.
If I did it on every service, I would lose a possible repair opportunity.
The diaphragm usually lasts about 5-7 years on most boilers.
As a result of a design fault those on the Excell they last a lot less than most boilers. I have not heard a convincing explanation of exactly why they have such a short life but they seem to get overheated.
Tony
If I did it on every service, I would lose a possible repair opportunity.
The diaphragm usually lasts about 5-7 years on most boilers.
As a result of a design fault those on the Excell they last a lot less than most boilers. I have not heard a convincing explanation of exactly why they have such a short life but they seem to get overheated.
Tony
If there is a long dead leg of existing hot drawoff pipe back to old cylinder position it takes of few more seconds for pressure to build up to shut the divertor valve down causing it to overheat slightly and toast the diaphragm
It's not a design fault. From their introduction these diaphragms were considered a consumable, hence why they were so cheap at the time and easy to change. As usual though, instructions just show a combustion service, however most will know this is inadequate on an old mechanical combi.
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