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View the thread, titled "Overflowing Feeder Tank - Advice Needed" which is posted in Central Heating Forum on UK Plumbers Forums.

Hi - I'm hoping someone can help with some advice.

Ahead of some renovation work, we had a 50 year old old floor standing boiler in the utility room removed and a new Worcester Bosch Greenstar 24Ri wall mounted in the garage. Aside from being old, the original boiler worked perfectly. A full assessment of the house and what we wanted doing was conducted some weeks prior to the work commencing.

The install started badly on day one when the engineer connected the condenser pipe (I think that's what it's called - it carries water anyway) to an air extraction pipe used by the electricity-powered extractor fan in the downstairs cloakroom, and got worse from there. To cut a very, very long story short, ever since the new boiler was installed, whenever the heating or hot water switch off, the feeder tank in the loft overflows and hot water spews onto the patio for about 2 minutes.

BG have been back multiple times to try and fix this, and every time they leave, the situation is worse than it was prior to them arriving. They have suggested two possible resolutions. The first, which they themselves discounted on the grounds of disruption and cost, is to re-pipe the house. The second is to convert the system to a closed system. I've said no to both. Lifting floors and running new pipes is unacceptable and converting to a closed system to bypass the feeder tank feels like a fudge. I'm no expert but it seems to me that hot water filling the feeder tank when the system switches off means it's pumping the wrong way and that's what needs fixing. Removing the feeder tank doesn't address that, does it? Surely it's just moving the problem elsewhere? Plus I've also read that a closed system can result in leaking radiators and pinholes appearing in pipes, especially if they're old (it's a 1971 house with pipes buried in screed flooring downstairs).

BG are now telling me I either need to accept the system is converted or my complaint will be closed and they will expect full and final settlement of the outstanding money, which I've refused to pay until the system works as expected.

Should I accept the recommendation of a converting to a closed system or do I refuse and escalate to CDRL?

Thanks in advance for any and all replies,
R.
 
There is a 3rd option for B.G and that would be to subcontract the issue to a local independant heating engineer to either survey and identify the probelm or fix the problem.
I don't suppose they bothered to survey the existing system and highlight any existing design issues before they quoted.
I think the same issue would be there if any of the national, next day fast fix boiler swop companies had done the work.

If you do end up accepting that it be converted to a sealed system then it could be with the proviso that B.G cover any future leaking pipework and Rads.
 
Is the newboiler a heat only boiler with a external circulating pump?, if so can you post the make/model and a photo of its LEDs while running or its mode/settings of the pump and where located, is it installed on (from) the boiler flow.
Also your vent and cold feed arrangement.
Was the system power flushed or/and chemically cleaned before the new boiler installation.
 

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Overflowing Feeder Tank - Advice Needed
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