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So to hopefully conclude this thread: lowering the F&E tank level by a couple of inches appears to have stopped it overflowing on start up, although I suspect there must still be an element of pumping over. I am attaching a photo to show where the new (white) 2 port valve is in the circuit, as...

I'll go and see what happens over a complete heating cycle in the next couple of days. Thinking about it now, you may well have a point about the connections:- It seems the original gravity system was modified for the previous floor standing boiler installation, which used a 2 port valve next...

Sure, I can go back and sit in the loft with a bucket for however long it takes: I already asked my mother to leave a bucket under the overflow pipe so we could see how much we are talking about, but it keeps bloody raining! The system was not originally designed as an S-plan layout and that in...

Sorry, only just seen some of those replies - "Overflowing and pumping over are different....As you ask, expansion of water between 20 and 80°C is about 2.7%, so 4 litre for your system." By overflowing, I meant water exiting from the F&E tank overflow. Taking 4 litres as the estimated...

Water is still overflowing with the pump on medium speed. I understand that the F&E tank is there to allow for expansion as the water heats up, but have no idea how much expansion is expected in a 150 litre system. I expect there is also an element of restricted pipework contributing to the...

The resting water level in the F&E tank is about 2 or 3 inches below the overflow. I didn't adjust it, but instead turned the pump setting down to medium instead of high. Seems okay now - fingers crossed.

Yes, I did wonder about that. That was with the pump on fastest setting.......I'll check the level when I go later in the week.

More or less resolved at last! We got a company in to do the powerflush and then the plumber returned and fitted a wireless system, which enable hot water and heating to be controlled independently. The Gas Safe Register inspection threw up some minor issues which the plumber also addressed and...

I thought that was the whole point of the wireless thermostat kit - to enable remote switching of the 2 port DHW valve.

He has proposed putting in a wireless cylinder stat instead of running a cable to the wiring centre.

No, just to a fused outlet on the wall.

Thank you. That is what the plumber said - needs a 5 core cable to the wiring centre. So is wireless the best way to go and if so, does that cost around £300?

The plumber explained that in normal use the thermostat is doing nothing at all and the the primary circuit only stops running when the boiler stat is satisfied. Perhaps it works when the immersion heater is on, but we need it to work when the boiler is on.

...which is wired to the immersion heater along with the 2 port valve. There is no cable to the wiring centre near the boiler, hence the question.

Well..... it's reassuring to hear that the plumber has offered to reduce his bill by £500 to cover the cost of a powerflush. He has also offered to pay for and install a wireless thermostat, instead of a new cable between the hot water cylinder and the programmer, which will enable hot water and...

I have emailed him explaining that we are getting someone in to power flush the system, which will hopefully satisfy the boiler warranty conditions and this is our immediate priority. Hopefully the Gas Safe inspection won't find anything too problematic and then he can come back and complete the...

I just read that X800 has a pH of 6.3 in concentrated form, so almost neutral.

Those are interesting points. The Sentinel kit looks good for testing a treated system after installation, but for now I want to provide evidence that the X800 has not been flushed out. Is there a test for that? We have not seen any heat loss calcs, but I have no idea whether they were done...

Thanks. It sounds like the most likely way to a quick and satisfactory resolution would be to put in writing what seems to need doing and offer him the opportunity to do it. I checked with Gas Safe and he is registered. As things stand, I'm planning to send an email tomorrow, detailing our...

Yes, that all sounds plausible. The flue is a nuisance issue and not performance related (although the boiler switches are too low to see properly in that unlit cupboard). The wiring should be easy enough to resolve, but the consequences of installing a new boiler in a sludged up system sound...