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I have previously come across a valve (French I think) that replaces a toilet cistern with an automatically dispensed volume of water for flushing a toilet, thus removing the need for a cistern. All I can seem to find at the moment are ones for urinals and systems that simply lift a siphon...

We are currently having plenty of work done on a house and we are considering a Vaillant EcoTEC 937 but before we take the plunge we'd like to know how much a replacement heat exchanger is likely to cost. We live in a hard water area and had to replace one on our old Vaillant TurboMax (which...