7m pipe run between pump and shower mixer - 15mm or 22mm

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5 Aug 2009
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Location
Cambridgeshire
Country
United Kingdom
I'm looking at doing the following...

1.5 Bar Salamander pump on floor at side of WHS tank...
Warix flange from HWS tank and new drop from CWS tank...
H+C pipes from pump outlet back up into loft ~1.5M...
4M pipe run over to en-suite...
~1M drop to mixer...

Doing some rough pressure loss calcs, it looks to me like running in 15mm (given that there will also be 4 x 90 degree bends) will give me a reasonable pressure loss.

Should I step up to 22mm just to be safe, or am I going OTT (or put a 2.0 Bar pump in)?

Many thanks
 
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