While one shower is in use, the other receives only cold water.

[John.g]

Could the flow rate to each shower be reduced to say 5 /6 LPM by fitting restrictors in the shower heads?, the combi might then supply both and also just one as long as the flow switch is still happy and the boiler modulates down without cutting out on hi temperature, a 28 kw boiler should theoretically supply almost 11.5 LPM with a 35 deg deltaT.

 

[Ben-gee]

I wouldn’t do that, then you’ve got two poor showers.
As the lads say, if you don’t need two together - just leave it.
Otherwise it’s a big update required.

 

[ade]

Thank you all for your input!

 

[ShaunCorbs]

Would an Electric shower be an option ???

 

[ade]

Would an Electric shower be an option ???

To be honest I never loved them. I think I will keep things as they are for now

 

[John.g]

Have you tried just throttling down the flow on both showers to see if you can get both to deliver hot water together, for the odd times that you require both on it might be relatively easy to get a feel for the position of the flow control, it (they) might even be indexed, obviously you will only get "half flow" from each and would require the cooperation of both users!.