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Tacheovale
konastab01
Don’t go too cutting edge. We got a Vaillant EcoTech Exclusive super green blah blah a few years ago when it first came out.
All the engineers that came round (three or four before someone worked out the problem) said they’d never seen one before. Ours was basically a test case to see what goes wrong and consequently what setting to use on future models. Luckily I wangled a seven year warranty so all this was free, if very frustrating.