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Right so a power flush won’t work on microbore. Folks might say it will but from experience it’s a waste of time. You could drain the system and take the radiators off too that you feel need a flush and take them out the back and hose them, that’s a trick we do sometimes too but if so bad it’s a change rads
If radiators aren’t heating it’ll 100 percent be a blockage, look for a manifold that’s where we always start and if worst comes to worst repipe the ones that are shit.
A modern combi is pressured so batters the water round the system, or do you have a standard system?
konastab01
@Brain-Stew
We're struggling to get our rads to heat the house effectively, and suspect it may be to do with blockages in the pipework (fnar fnar). The house was built in the early 90s with a gravity fed system linked to an immersion heater and gas boiler. It has microbore pipework throughout and I'm hoping that getting the system powerflushed may help move the water around a bit better. Anyone have experience with this or opinions about what make the system perform better? Suspect we may also need to change the valves to a number of the rads, but think that should wait until the system is 'clean', right?
Would love to rip the lot out and start again with a heat pump and solar panels, but with two little'uns running about we don't have the stomach for a wholesale job involving pulling the floors up/getting into the walls.