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Haha very true, but the last thing I want to find out is that she spent £1600 on something she didn't really need. Naturally I wouldn't have to tell her that but the knowledge would haunt me. In any case I think we now have the best hot water system in this part of London: it's amazing. :D...

Hmm, good point. I've put it back down to 2.8 which is what the plumber put it at (I assume: I wasn't here when he left) and just decreased the cut-in differential to 0.5, which means the pump should kick in before the pressure drops too much. You know I'm not convinced we needed this...

Aha, so perhaps the pressures for cut in and out are too low? I think they're 2.8 for cut out and 1 below this for cut in. I might bump it up to 3.5 and see what that does. It's not the most user-friendly control panel I've seen: what other device asks for a password each time?? I suppose...

Hello, We've just had one of these babies installed along with a new Vaillant combi boiler: previously we had two tanks and a shower pump with a standard non-condensing boiler. The new system looks very impressive. With the old system when you turned on the hot tap the pump would kick in...