I am renovating my bathroom.
The hot and cold feed for the bath comes from 22mm copper pipework under the floor and comes up with isolating valves on each end. On the hot there is a tee fitted with its end at 15mm which I plan to have the shower run on.
The thermostatic shower valve I have bought takes hot at 22mm..
Is it safe / ok and won't reduce flow rate if I fir a 15mm adaptor to 22mm off this tee piece?
It seems silly to have the water come up in 22mm, be brought into roughly 15cm of 15mm l, then be stepped up to 22mm again... Not professional I imagine but will this be ok to do?
If not, looking for suggestions if possible?
Additional info that I am not sure is important.
- hot pipes from the tee to the shower will be roughly 3.5m
- Recently had a new boiler fitted into the loft which was previously ground floor and is stronger so we have better water pressure than standard. 28 psi/ 2 bar.
- I plan to use push fit pipes and used previously in the other bathroom.
Help or comment would be much appreciated
Are you a tradesperson and able to answer this question?
A lot of info but do you have a combi boiler, conventional water cylinder or an unvented cylinder? If you have a combi it's probably not an issue, if you have a conventional hot water cylinder then it will be a problem, if you have an unvented cylinder it might be okay if the 15mm pipe only feeds one outlet.
Traditionally hot water was supplied in 22mm 0r 3/4" because of a gravity fed system, Many times when plumbing is altered or a new boiler is fitted the plumber will connect to your existing system if suitable to do so, connecting 15mm to 22mm without any problems. If you are using a combi type boiler then your hot water is being fed around your house at full incoming water pressure so having pipes stepped down from 22 to 15 isn't generally a problem, That's not to say that there aren't other issues hidden somewhere else.
In all honesty in a domestic setting you wont notice an increase or reduction from 15mm to 22mm back to 15mm. Chuck the push fit in it will be absolutely fine.
A lot of info but do you have a combi boiler, conventional water cylinder or an unvented cylinder? If you have a combi it's probably not an issue, if you have a conventional hot water cylinder then it will be a problem, if you have an unvented cylinder it might be okay if the 15mm pipe only feeds one outlet.
I would suggest to use 22mm equal tee where 22mm hot feed reduce down to 15mm then carry on 22mm pipe upto shower. So you won't affect your flow rate. I don't think that distance from Tee connection to shower will effect its pressure and push fit is absolutely fine to use them as it is safe to use upto 10 bar.
Hi as long as its a pressurised system and your hot and cold are mains fed through your boiler without any header tanks, reducing to 15mm is perfectly safe to do without loosing pressure.
I would likely suggest the shower entry points are 3/4” rather than 22mm so you will need 3/4” to 15mm or 1/2” reducing collars that way you can simply run 15mm flexipipe to your shower valve.Hope that helps.
