Do you change 22mm hot feed to 15mm when converting to combi?

[SPC]

thoughts on above really. when converting a traditional system to a combi and you fit the boiler in the old cylinder cupboard, is it worth the extra effort to change the hot feed to the bathroom from 22mm down to 15mm, would the difference be noticeable enough to justify doing it.

Basically I did the conversion at my own house a few years ago and i'm soon to be doing the bathroom. the run wouldn't be particularly difficult to do (2 hours at most) ill be having a wall mounted bath shower mixer in the bathroom but im debating whether its worth the extra effort and is it actually going to make much difference.

 

[SimonJohns]

It will save a lot of water. I don't think there's many other benefits.

 

[Leo21]

Don't think is about extra effort, more about extra cost on a job. I've never seen anyone do it, so I would think you will lose out on price. In your own house your choice.

 

[SPC]

my only concern really is would it give me more pressure at my shower if i ran it all in 15mm as oppose to it going 15mm for the 1st meter, then 22mm for 7-8 meters then back down to 15mm

 

[Backboiler]

No. There is no point

 

[SPC]

haha cool, its not very often the easier option is the one to go for!!

 

[JAH HEATING]

Mite when we did Install's for them, part of the spec was to change the run to 15mm

****e prices aswell

 

[glenno1]

Combi boiler h/w draw off is designed for 15mm so i would change pipe to suit

 

[AWheating]

its only going to effect the amount of water wasted before the hot water reaches the tap really. So unless your on a water meter or its a long run if not really common practice.

 

[Backboiler]

Combi boiler h/w draw off is designed for 15mm so i would change pipe to suit

I wouldnt

 

[glenno1]

You may get noise as the 22mm pipe back fills when tap turned off