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OK, back home, and as promised here are the pics First one shows how tight it is in there Second shows the pump angle Third is the Chenral Heating Cleaner bottle Also I checked the F&E tank and it's definitley has some water in there, it's slightly warmer than the cold tank, but may have come...

I was worried about the tilt as well but the manual does say it's OK at a slight upward angle, but not down.... The tank is in the loft so 1 floor up from the pump and 2 up from the boiler

It's been drained twice since then and had a second pump installed, I'll check what cleaner it was as the bottle is still by the tank

Wow, wasn't expecting so many replies It's a UPS2 not Alpha, and it's tilted up by 15-20 degrees from flat, which seems to be in keeping with their recommendations for a horizontal setup. They didn't replace the body the second time as it's in a tricky spot and very difficult to wedge in....but...

Open-vented system, horizontal pump, had a problem with the old pump, engineer replaced it with new Grundfos. 2 Weeks later, when it started up loud banging followed by a loud whoosh after 2 minutes The boiler was kettling as the pump wasn't running, but the light is on, then after a bit the...