15mm hot to bath?


In a system with a condensing combi boiler with a 15mm hot water outlet and no hot water cistern where should one convert from 15mm to 22mm pipe to supply the bath taps? Would it make any difference to the pressure of the water at the tap? Should the conversion be near the tap or as far away as possible? Or does it make no difference?
Ta
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The shorter the length of 22mm, the less cold you will have to run off before getting hot to the bath so you get faster warm up. If you leave a couple of metres of 22mm then you may get a water hammer type clunk when the bath or sink tap is closed quickly, most likely caused by a shock wave hitting the 22/15mm transition so it's a good idea to take 15mm right up to the taps, plastic pipe is good for doing retrofits of this type.
At mains pressure I wouldn't worry about 15mm causing a restriction in flow at much less than 10m.
--
fred
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