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Sorry, I didn't mention in my first post. My mains feed comes in to my downstairs bathroom - so the tap I took the measurement from downstairs is straight off the mains. 7s to fill a litre... So about 8.5l/min. How does that compare to normal? I think my mains pressure unrestricted is 7-8bar...

Hello, I'm looking for some help with my hot water system. My hot water is powered by an air source heat pump, which I think is equivalent to a pressurised, unvented system. There's a large hot water heater/storage tank in my downstairs bathroom, fed by the cold mains feed at an inlet pressure...