Hi, I'm having a new boiler installed as part of grant scheme in a few weeks' time. My GCH stopped working about 7 years ago and I couldn't afford to keep fixing it - at the time my boiler was only about 3 years old, but was told after about 3 fixes that it was sludged up and needed a power flush. I couldn't afford that either and have had to use oil radiators ever since. I've explained the sludge issue to the new company doing the installation and they say they don't power flush but they do a manual flush and will fit a magnetic filter, but if for any reason they can't get the heating working, then they'll do a power flush. Do you think the manual flush will be sufficient? I'm worried that the whole problem will repeat again. Would be grateful for any advice.