I want to flush my central heating system as the boiler sounds like a jet taking off when it's heating the house - okay on the water funnily enough. I want to drain it a few times till the water's clear, then fill it with some chemical flusher stuff for a week, then drain it again and refill it with the proper inhibitor stuff.
My problem is that there are three radiators upstairs which can't be bled. The bleeding valve is stuck. I don't particularly want to replace the radiators as I can't get any the same size. What are my options?
Thanks