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DESPERATE DAN,do you know where the powerflush machine was connected to ? The 'engineer' ? had to weld two new valve openings on to the inlet & outlet pipes that come out from the bottom of the boiler. As I had to go to work, I didn't see how the powerflush machine was attached. How he...

The heating tank is the higher one, I assume , as the lower one refills when we run the hot water.

Not sure about that oilman, but we have 2 water tanks in the airing cupboard , one above the other, both above the hot water cistern. What's the 'nasty thought' if it is a primatic cylinder ?

Vaillant Thermo compact boiler. Upstairs radiators working but down stairs stone cold. Engineer installed new pump to improve flow and put pipe flusher fluid in system. After 10 days no difference at all, so spent nearly a full day powerflushing system - still nothing moving, so were advised...

After a powerflush, I'm informed that the C.H. system is still blocked and will mean all new piping has to be installed. Are there no other alternatives ? Also after the power flush the hot water system was contaminated with what I assume is the dissolving liquid - the sink and bath are stained...