There are of course lots of different designs for generating hot water that have different forms of benefits and issues. The problem of having to run the tap for some time before any hot water gets to it is due to water in the pipes getting cold and having to be drained to let the hot water through. The longer and thicker the lines between the boiler and the tap the longer it takes for this to happen. And the better the insulation on the pipes the longer it takes for the water in the pipes to get cold again.
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