Not only is the customer amazed, it works an absolute treat – 1st time! Not that we would expect any less from our engineers (James in this instance) as they pride themselves on their abilities, attention to detail and their unrivalled knowledge (this being a multi zoned system with weather compensate, low loss header, plate heat exchanger, divicon mixer units, bespoke cyclinder, the latest Viessmann boiler….I could go on forever. A superb piece of kit, superbly installed). The fact it is to be hidden away in a tank storage cupboard makes no difference to us. What you see is what you get – QUALITY: sublime quality.