Worcester Bosch 28CDi combi - what's a normal system pressurerise from cold to hot?
WRT the neighbour's system, they may have a rad full of air. Also are
they running lower flow temperatures than you?
It's obviously a possibility that there's air in one or more of my neighbour's rads. I did notice the CH was set a bit lower on the boiler too, although the house was comfortably warm.
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