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"anti-gravity valve" ... absolutely no idea, we got some guys to fit the system and I wouldn't know what one looks like let alone whether one is/was present.

Hi, Hope someone can help, we have a radiator in our living room which during cold weather seems to struggle in maintaining room temperature above 21C. First, a bit of background, We replaced an aging (inefficient) back boiler with a new Vaillant EcoTec 824 (recommendation of an EPC) which...