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Boiler: no continuous warm water
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andre_xs
Posts: 286 Forumite
Hi,
our boiler is behaving a bit "funny":
When we take warm water for a longer time (e.g. having a shower), then the water gets nicely hot in the beginning, but after a few minutes it starts to get colder and colder, then warm again, then cold again, and so forth. When I look at the boiler I can see that the burner/flame is not continuously on, it goes on for a minute or so, then off for a minute, and so forth. This is not always the case, sometimes it runs continuously. It hapens when we take water from any tap, and I tried different heat settings on the boiler.
When the boiler works for the central heating, then the burner/flame runs continuously without any problems.
It is a quite old (10-12 years) Isar HE24 boiler.
Does anyone know what may cause this type of problem (and roughly how much a repair is and whether it can be done by oneself)?
A related question: If I asked a boiler repair person to give me a quote what the repair costs, does that typically already cost something (i.e. coming out to give a quote) or is that free?
Best wishes,
Andre
our boiler is behaving a bit "funny":
When we take warm water for a longer time (e.g. having a shower), then the water gets nicely hot in the beginning, but after a few minutes it starts to get colder and colder, then warm again, then cold again, and so forth. When I look at the boiler I can see that the burner/flame is not continuously on, it goes on for a minute or so, then off for a minute, and so forth. This is not always the case, sometimes it runs continuously. It hapens when we take water from any tap, and I tried different heat settings on the boiler.
When the boiler works for the central heating, then the burner/flame runs continuously without any problems.
It is a quite old (10-12 years) Isar HE24 boiler.
Does anyone know what may cause this type of problem (and roughly how much a repair is and whether it can be done by oneself)?
A related question: If I asked a boiler repair person to give me a quote what the repair costs, does that typically already cost something (i.e. coming out to give a quote) or is that free?
Best wishes,
Andre
0
Comments
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Sounds like a restriction in your plate heat exchanger0
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As above,
Your boiler is heating the water but due to a restriction, possibly scale the water heats too quickly which causes the overheat sensor to cut off the gas, until the water is cool enough for the sensor to allow heating again.
You will need either the heat exchanger de-scaled or replaced.
As a short term "fix" turn the water temperature down, the allows the water to flow for longer before the sensor is triggered because the water isn't being heated as much0
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