Pete Posted April 14, 2020 Share Posted April 14, 2020 Just about to fit this Hansgrohe controller and wondered if anybody has fit one of these? I am just dithering (as we self-builder's do) because the two inlet connections which are the yellow discs are 3/4" and the two outlets are 1/2" which go th the shower itself. I have fitted 15mm supply pipes but the bit I am dithering over is should I have run 22mm seen as it is 3/4" or am I just over thinking it. I think I need to just get the appropriate fittings and use the 15mm pipe seen as I am using 15mm from the controller to the shower. TIA Link to comment Share on other sites More sharing options...
ToughButterCup Posted April 14, 2020 Share Posted April 14, 2020 7 minutes ago, Pete said: ... I have fitted 15mm supply pipes but the bit I am dithering over is should I have run 22mm seen as it is 3/4" or am I just over thinking it.... I've 'worried' the same problem half to death myself and in the absence of evidence, come to this conclusion : Maybe the 3/4" issue has to do with supplying 2 separate 15mm outlets at the same time. In other words, in a shower for example, if it is possible to use both the overhead showerhead and the hand held wand at the same time, then the unit will work better with a 3/4 supply. Link to comment Share on other sites More sharing options...
Pete Posted April 14, 2020 Author Share Posted April 14, 2020 Yes, had the same thought but with the smaller 1/2" on the outlet of the controller to the shower then surely it does not matter if the supply pipes are not 22mm. @PeterWwill know! Link to comment Share on other sites More sharing options...
ProDave Posted April 14, 2020 Share Posted April 14, 2020 I used 15mm on both my showers (different make but same principle) to keep the volume of water and hence time for hot to arrive, to a minimum. My only regret was I used full bore 15mm isolator valves. I wish I had used the normal slightly restricted bore isolators to act as flow restrictors and reduce the maximum flow rate a little. Link to comment Share on other sites More sharing options...
Pete Posted April 14, 2020 Author Share Posted April 14, 2020 @AnonymousBosch, when you actually take the yellow discs out and have a look at the size of the hole in the brass casting it is quite small so my way of thinking is 15mm pipes will be ok (I think) 1 Link to comment Share on other sites More sharing options...
PeterW Posted April 14, 2020 Share Posted April 14, 2020 Most of the pipe work inside those units are around 12mm so even supplying it at 15mm is adequate. Flow and pressure are two, but the real issue is balance. If you have a pair of balanced hot and cold 15mm flows they will have ample supply to support the shower outlet. It is when you have an imbalance toward cold then the overall will suffer. Link to comment Share on other sites More sharing options...
PeterW Posted April 14, 2020 Share Posted April 14, 2020 1 hour ago, ProDave said: My only regret was I used full bore 15mm isolator valves. I wish I had used the normal slightly restricted bore isolators to act as flow restrictors and reduce the maximum flow rate a little. Just put a flow restrictor in the shower hose at the head. Link to comment Share on other sites More sharing options...
Pete Posted April 14, 2020 Author Share Posted April 14, 2020 17 minutes ago, PeterW said: Most of the pipe work inside those units are around 12mm so even supplying it at 15mm is adequate. Flow and pressure are two, but the real issue is balance. If you have a pair of balanced hot and cold 15mm flows they will have ample supply to support the shower outlet. It is when you have an imbalance toward cold then the overall will suffer. Thanks very much, why do you have more doubts when doing it for yourself! Link to comment Share on other sites More sharing options...
ProDave Posted April 14, 2020 Share Posted April 14, 2020 33 minutes ago, PeterW said: Just put a flow restrictor in the shower hose at the head. Too late now. The reduced flow would get noticed. I keep trying to say the knob does not have to be turned on all the way. Link to comment Share on other sites More sharing options...
ToughButterCup Posted April 16, 2020 Share Posted April 16, 2020 On 14/04/2020 at 19:32, ProDave said: [...] I keep trying to say the knob does not have to be turned on all the way. Simple , clear evidence that psychology has a part to play in plumbing. "Not a lot of people know that." (Trump D. 2020) Link to comment Share on other sites More sharing options...
Jeremy Harris Posted April 16, 2020 Share Posted April 16, 2020 I've left a 9 litre/minute flow restrictor washer in our shower head. Hasn't been noticed yet . . . 1 Link to comment Share on other sites More sharing options...
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