Water – How to stop the boiler from heating the radiators when only hot water is wanted

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I have Baxi Boiler (model unknown at this precise moment in time) which British Gas have fixed up to a seperate control panel (see image – not our actual panel, image from Google!).
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The problem is that even with the Central Heating set to off, when we want hot water, either via the timer or setting it manually to "on", all the radiators heat up.

Is an easy to fix problem? Has the control panel been set up incorrectly, or is this a problem with the boiler?

Best Answer

It could be:

  • an electronic problem, does the radiator heats up when you don't "ask" for hot water (with the winter setting)
  • a deficient 3-way valve, you should have two distinct pipes for the hot water output, and they are wired on a 3-way valve that distributes hot water in the two circuits. If the valve does not work, then you may have what you experience, or you may need the winter setting to be on in order to have hot water, or you may not have hot water at all. This is a rather common problem.
  • a plumbing problem: someone forgot that there is a need for two distinct circuit. This problem is highly unlikely if the plumbing has been done by a pro.
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