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Does such a thing exist for pumping fluid? I mean for refilling the system not recharging the expansion vessel.

I can’t say I’ve got an old pump lying around but I was wondering if one of those drill pumps (pretty cheap on amazon) and a laborious bleed process would work?

Seems to be holding pressure although it has dropped a little. I need to recheck and see if it’s just the pressure in the expansion vessel or whether I’ve lost some fluid. Does anyone have any thoughts on how to refill this type of set up (given there is only one port) without adding a fill...

I managed to rig up a filling loop from the garden hose into the isolation valve and charged both the system and the pressure vessel to 1.5 bar. Managed to do it out adding any air too which is a plus. I forced the pump to circulate for a while and bled from the high level vent a few times...

Thanks for that - reassuring at least that the whole system isn’t just condemned then like the engineer who visited said. I inflated the expansion vessel to 1.5 bar but no move from the pressure gauge, so I released it back. I also drained some fluid out of the filling port and very little...

Yes that's a job I'm planning to do today. Will report back if it works. It's evacuated tube - I've attached an image but it's taken from the road round the corner on my phone so not the most detailed!

He was an electrical engineer. No idea whether he dabbled with plumbing but there are a few other quirky things in this house! It's a 3 zone system with all the valves, pump and wiring centre conveniently located under floorboards beneath our freshly laid carpets! Yes it does appear to...

Hi - first post but thought it was the right place to canvas opinion as I always find myself on here when doing various DIY jobs! I’ve just moved into a house with what I thought was a functioning solar thermal set up. I had no history of the set up when I got the house as the former owner had...