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These are the only pics I have but will measure and take more tomorrow. Yes, it fills with good pressure when float valve is pressed down. Excuse the 230 years worth of dust!

Thanks Andy. I’m going to double check that size as 25 gallons is very small. I may have miscalculated. Will measure it again tomorrow.

Hi, Sorry for the delay in reply- I had to escape the city for a few days. So, the CWST in the attic is approx 114 litres/ 25 gallons with 28mm pipes x2 coming from it, sitting just above ceiling level. When I went to check, it wasn’t completely sealed but there wasn’t any large debris...

That’s true. I thought there would be enough height but the pipes coming out of CWST are horizontal for a couple of metres and I think this is where the airlock problems are occurring. The hot water tap in the kitchen has never had good pressure either but I assumed this was because the HWST in...

Yeah, I had wondered about that too. I shall investigate

The water to my bathroom has always been a problem, especially the cold water tap which often gets air locks in it. Occasionally the toilet cistern stops filling too. I’ve been advised that the reason for this is that cold water tank in my attic (4th floor flat) is only sitting on the ceiling...