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I have a problem with the DHW. After the initial preheat water has run out the hot water becomes luke warm. I've had the diverter valve replaced but this has not fixed the problem. Whilst i know i need a plumber to fix the boiler, I don't want to be paying for guess work. Any help...

im planning on installing a new shower into my house. im installing a combi boiler, and am unsure what kind of shower to install. Ideally one which requires the least effort. Could i install a mixer shower, connected directly to the combi boiler, or would i require a pump. what would the...