I would like some advice if possible, as I'm no expert on central heating but feel I've been ill advised.
I had a new boiler installed Mar/Apr this year by a Gas Registered plumber only because of it's age, otherwise the whole system was working. The hot water system was working fine but the central heating wasn't used until October. When it was switched on the central heating, the radiators downstairs were cold, but the rads upstairs were warm but not hot. I contacted the boiler installer who came out & suggested my pipes needed replacing due to them being a 'single-pipe' system and would never be any better. He didn't mention that there could possibly be a problem with the boiler.
I also had a 2nd opinion from British Gas as I have an insurance policy with them. They suggested a £700 power flush but they couldn't guarantee the problem would then be sorted. They couldn't look at the boiler as it was under warranty.
So I went with the new pipes. I was quoted £780 for new pipes, but £1780 for new rads as well as pipes. As you can imagine, the disruption was horrendous as I have 3 bedrooms with laminate flooring. A friend of mine kindly agreed to lift the flooring & relay it so the plumbers wouldn't be responsible as I had a feeling they weren't carpenters!
So having had all new pipes & radiators (I thought it might be best to do that at the same time as the system was best part of 40 years old) - the problem of the cold radiators downstairs was still there. You can imagine how furious I was. The plumber then tried to tell me that the boiler had been overworked due to the one-pipe system & that boiler engineers (Worcester Bosch) would be coming out to have a look at the problem. They then found that the heat exchanger was full of silt from the previous pipework as it hadn't been flushed before the new boiler had been installed. So when I'd switched on the central heating the sludge got pumped around the house & into the boiler. I had a new heat exchanger installed & the rads are now working fine.
I wasn't charged for the new heat exchanger (the plumber reckoned he'd call in a favour as he knew them). Really? Do Worcester Bosch dish out heat exchangers & engineer visits for nothing? The day after the boiler engineers visited, I mysteriously needed my header tank removing & replacing with a pressurized version. When I asked why - "it's all part of the boiler installation so you won't be charged". Strange that isn't it? If that was a part of the boiler install, why wasn't it done in April at the same time as the boiler?
There is still silt in the system as at least one radiator has stopped working since. When I queried this, I was then told to knock the TVR with a hammer to dislodge the muck. That did work but I'm now wondering whether this remaining sludge is going to continue to cause me problems. The plumber says he's put some more chemicals in to prevent this but is that adequate? When I asked the plumber why he hadn't flushed it, he said that he couldn't have flushed a 'single pipe system' as it doesn't work. So he had just put chemicals in to break down the sludge.
I am now waiting for the £1780 invoice- but feel that I was badly advised. If the system had been flushed before the boiler had been installed, I wouldn't have had the problem. If the engineer had checked the boiler before advising me he could have seen that the heat exchanger was faulty. I realise that a single pipe system is not efficient but I do think I was badly advised and would like to challenge the plumber on the bill when I get it. I would be interested in your opinion.