• Thanks for all the useful responses.

    I don’t know anything about the system, or plumbing at all, as is probably evident.

    It’s a block of twenty flats, I can tell you that the water is included in the service charge if that indicates anything. Checked the pressure and it’s equal in both the bath and the basin

    The boiler is this mammoth thing. Not a combi, what is it?!

  • Thats a unvented hot water cylinder, that should give you main pressure hot water. So what ever you cold is coming in, you'll have hot at the same pressure or should.

    It could be various things, is there an expansion vessel on that cylinder or is it internal as it may need to be recharged. Are the pipes coming out of it hot if you run the tap in the sink in the kitchen?

    That will either be heated via an immersor or a boiler will heat it.

    I also would think that will be the hot water for the full block of flats my mum and dad have a cylinder the same size in there house.

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