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Thanks for all the replies. I left the system as I was away for a couple of days and the blockage appears to have shifted as I was able to bleed all the rads easily. The system is still very slow to heat the rads up though but that was one of the reasons for adding the cleanser. I'm hoping by...

Thanks @JohnD, I'll give that a try. The F&E tank was very sludgy, probably about 2cm of brown sludge at the bottom.

@Crofton Gas, I'm not sure where the valve is, all I can see on the side of it is a lever that has Auto and Manual positions - it's currently in the Auto position. @Terrywookfit I'm pretty sure the air was coming out, I put some spit on the bleed hole to see if air was coming out silently and...

My CH (open-vented) system had undoubtedly got very clogged up with sludge - all the rads on the ground floor had very black water when I bleed them, though the water was clear from the upstairs rads, plus the system was very very slow to get warm. So rather than just flush the system I thought...

Thanks @oldbuffer, there's 17 rads in the system so I'd imagine that would put the price up a bit. Found a local company that says it would be around £350 for up to 10 rads then £30 for each extra, so £560 in total, I'm guessing that's about an average price. Presumably, if I have time on my...

I'm fairly certain the CH system at my girlfriend's house is in dire need of flushing because this last winter the system was very slow to heat the house up and all the rads on the ground floor had very sooty water when I bled them, upstairs ones not so much. The pump was also making more noise...

Great, thanks. There aren't any mixer taps (apart from kitchen which is on mains) but the leakage possibility is a risk I suppose. The house isn't very old (~25yrs) so you'd hope it had good joints but it's hard to tell. Pity they put such an antiquated system in in the first place, my house...

Hi, My girlfriend's house has a cold water header tank in the loft that feeds to the hot water tank and all the cold taps except for the kitchen. My question is given that the mains must be feeding the tank and the cold outlet to all the taps must be one (or 2) of the tank outlets, would there...

Main problem is that I don't know where I would connect it. There's only a toilet, 2 sinks, the bath/shower and the immersion tank connected to the water supply. As I understand it most gauges have a screw connector. (Plus it's France so I don't know if the fittings are the same sizes as the UK)...

I'm thinking of replacing a shower that is fed from an immersion tank with an electric shower because the tank is not very big so the HW runs out quite quickly. The problem is that it is in a studio in a block of flats in France and so I have almost no knowledge of how the water supply works. I...