15mm or 22mm pipe

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Hi people just starting the plumbing on the new extension and making good the old pipe work as the bathroom has moved my question is I'm running everything in 15mm speed fit to make my life easy. Do I need to use 22mm on the bath even tho my combi boiler only has a 15mm feed?
 
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22 is needed when you have a low pressure tank in the loft to get enough flow. If you have high pressure it will probably make little difference.
 
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