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Spoke to the tank maker (Harton) this morning. They confirmed that it is an open-vented system which incorporates a hot water tank inside the enclosure. So John was absolutely correct. That creates a couple of new questions :) If I want to install a buster pump... should it be a positive...

Thanks again, I'll follow your recommendations and let you know the results.

Thanks John, but how do I establish for sure what type it is? I'm an electrician and have only a basic knowledge about heating systems. I've done some research and reading/videos lately so I know the difference between the different types of systems, but because the cylinder (tank? ) is fully...

Unfortunately it's not on their site probably because it's about 15 years old, and it says 'special order' on the sticker sheet. There is also an electrical immersion heater in this cylinder.

The boiler installed , if that matters is Vokera Mynute HE http://www.vokera.co.uk/wp-content/uploads/2009/04/mynute-he-installation-and-servicing-manual.pdf

Yes, I meant a cylinder, though it's enclosed in a white square wall mounted steel box The make is Harton CCHT Type C, Flat back J141 sorry can't submit a picture as I don't live there ( tenant does)

What I've got: -I live in a block of flats (one level, no lofts or upstairs) -Unvented system with a hot water tank on the kitchen wall the top of the tank is about 2m high from the floor level. - Water pressure cold/hot is reasonable (though not spectacular) throughout including the bath tub...