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Hi, I'm hoping someone can tell me what the 2 motorised valves are doing in my pumped heating/hot water system. The 3 way valve is not the original and is a V4073A which I understand controls both heating and hot water in a Y plan. However, there is also a second valve controlling hot water on...

Hi, I'll be fitting a Honeywell DU144 ABV to replace a corroded gate valve. Honeywell's instructions require the pump head and flow rate to calculate the ABV setting. I've found the pump head (2.0m) in the technical data of my Greenstar 24i sealed system but the flow rate is not listed. Is this...