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Tony, Yes, it is a gravity system. We had the system flushed and treated in November last year. Would you expect the system to get blocked with sludge again so quickly? NB I asked for the system to flushed and treated when we had TRVs fitted.

- Glow Worm Hideway 100 boiler (18 years old) - CH system fitted with Grundfos Selectric Mk II pump Problem: Until a few weeks ago we could get hot water by having only the hot water switch on. However, some of the radiators were also getting very hot. Now we can only get hot water by...