Posting a message to the forum will remove the above advertisement
  1. This site uses cookies. By continuing to use this site, you are agreeing to our use of cookies. Learn More.
  2. Checkout our Plumbers Insurance area - heavily discounted Public Liability Insurance and Van Insurance specifically designed for plumbers.

Discuss Some Consumer/Novice Shower Related Questions! in the Bathrooms, Showers and Wetrooms area at

  1. Bazzy

    Bazzy Member

    Hi All,

    I am a consumer and a novice & wish to get some help with issues & general questions! (Combi Boiler in house)

    1) I recently got a very large Rainshower Head (450mm x 300mm) that is in use with a hand held shower head on a Bristan Shower with a Diverter. Even though I have pretty good water flow from the hand held shower, the general experience with this large overhead drencher could be better tbh.

    I took off the screw head & inside there were two curved metal discs with holes in them & a ball joint with a surprisingly small hole in it for such a large shower head. I removed the two discs & there was definitely an improvement but I would still like it to be better. Some of the water spouts have good flow & others do not.

    I know this might sound silly or even stupid but as a novice, I would like to ask - if that hole in the swivel ball joint was made bigger, would it then improve the showering experience by allowing a greater & even amount of water to flow with better pressure/force?

    I ask as I am not sure if the hole in the ball joint was made that size to ensure proper flow of water & function inside such a large shower head or if it is that size simply due to silly EU Regs that wish to limit/regulate water delivery like they do on hand-held shower heads, toilets etc?

    Is it a good idea to try this out in the hope of getting better performance or will it mess everything up as currently that damn thing looks more impressive than it actually is! I have attached sample stock images of what my ball joint looks like & actual images of the shower head for reference.

    2) We also have an Aqualisa Shower in the upstairs bathroom & I have noticed that the hose on this one is a fair bit thicker than the Mira & Bristan ones in the other Bathroom & showering is excellent with the Aqualisa - really good, strong flow. I looked inside the Aqualisa hose & the internal bore is much bigger - I think it is around 12mm/13mm as opposed to 10mm/11mm.

    I would like to ask then, if I was to get a new Shower hose like the Aqualisa one, will it improve the showering experience on the Bristan Shower downstairs since more water can flow through the hose or is it nothing to do with water flow & a water pressure increase is needed instead?

    If it will improve the showering experience, can someone please recommend me where I can buy a 1.75m hose with this internal wide bore of 12mm/13mm that is reasonably priced? I really like Aqualisa one we have - it is great quality & has lasted ages but they are quite expensive & I was hoping that there might be some more affordable options out there!

    Many Thanks!

    Screen Shot 2018-10-15 at 14.07.43.png Screen Shot 2018-10-15 at 21.48.25.png Screen Shot 2018-10-15 at 22.27.53.png Screen Shot 2018-10-15 at 22.28.05.png
  2. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    You’re running that huge head off a shower hose??
  3. Bazzy

    Bazzy Member


    Our Bristan Shower with Diverter gives us two options to select from at any one time - either use the shower head attached to a hose connected to the shower wall outlet OR (by turning the shower control), from the overhead shower head which has it's own piping running to it from the shower valve if that makes sense.

    We can run one or the other but not both at the same time (sadly!)

    Many Thanks!
  4. king of pipes

    king of pipes Trusted Plumber GSR

    We need more pictures of what you have it's not usual to run such a large shower head fed through a shower hose it would normally be hard piped with the hand held riser rail type shower set connected to the shower hose. Cheers kop
  5. Chalked

    Chalked Plumber GSR

    Your combi boiler has limited capability.
    Probably between 8.5 to 12 litres a minute, d pending on the model and size.
    That head will handle 18 litres a minute. (TBH doesn’t look the best quality!) Unfortunately your boiler won’t.
    It’s perspective your seeing. Ie, both heads will be giving the same flow and it’s the amount your boiler will give that will limit it.
    Measure how long it takes to fill a bucket with each one and they are probably the same. If they are not, buy a quality head from Hans grohe
    • Agree Agree x 3
    • Informative Informative x 1
  6. Bazzy

    Bazzy Member

    Hi Kop,

    I am very sorry if my description of my set up was lacking 0r confusing - please have a look at the photos posted of the wetroom set up we have & that you asked for.

    In any case, do you feel that widening out that small bore in the ball joint will help improve the showering performance both in terms of flow & pressure? I know someone that works for a company restoring classic cars & they have to make many parts from scratch & have all sorts of specialised equipment so will be able to drill the hole much bigger for me if I asked but I need to know whether it will work or not first!

    Also, will using a larger bore Aqualisa Type Shower Hose increase the flow/pressure from the hand shower head in the shower bracket as shown in the pics? The current one is a Mira Response Hose I think in 1.75m & thinner than the Aqualisa one - if I can get even better & more powerful flow from the Hand unit, it would be really great!

    Many Thanks!

    IMG_5402.JPG IMG_5401.JPG IMG_5403.JPG IMG_5404.JPG IMG_5400.JPG
  7. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    I think as said before your boiler is your limitation. That head will probably only work best at say 18-20 Lpm your boiler will probably only produce 11-12 lpm
    • Informative Informative x 1
  8. Bazzy

    Bazzy Member

    Hi Chalked!

    Our boiler is a bit on the old side but it gets regularly serviced by Bosch - it is a Worcester Bosch 35CDi but the OLDER version - please see pics of it so you can assess it's performance/capacity etc - can you tell from the pics posted of it below of it's Litre per minute capability?

    When I get a chance, I will do the bucket test as you mentioned & let you know the results - should I leave the Shower Heads on or remove them so the water output is not subjected to differences due the differing shower head designs & in case they might be an impediment or should I leave them on?

    The Shower Head is a Hudson Reed - Model: Head88 - I have seen it vary in price between £99 & a eye-watering £307 so would be very disappointed if it is cheaply made as even at £99, it is still a LOT of money for just a Shower Head - £307 is just crazy!

    Many Thanks,


  9. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    We can’t tell it’s performance from looking
    • Informative Informative x 1
  10. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Also you should look up the spec of the shower head requirements
    • Informative Informative x 1
  11. Chalked

    Chalked Plumber GSR

    That boiler, if well serviced. Working to specs and gas rated correctly, will do 12 litres a min max at this time of year.

    So if your shower head is running at 14 or less. It’s been limited by boiler flow.

  12. Bazzy

    Bazzy Member

    Hi Chalked!

    You got me intrigued & thanks for checking out the numbers for me!

    I also found some manuals online & they also said similar - but stated 12.6 litres/pm (+/15%) with a temperature rise at 40 degrees but then also states 16.7 litres/pm at 35 degrees? I do not understand what that really means but which one is likely real? Does it mean at the higher temp of 40, one will get about 12L but at the lower temp of 35, one will get nearly 17L or am I way off track?

    If, 17L, then might that work with this large head?

    Please see images attached:

    Screen Shot 2018-10-16 at 22.39.32.png

    Screen Shot 2018-10-16 at 22.41.26.png
  13. Riley

    Riley S. Mod Trusted Plumber GSR Top Contributor!!

    Really think you’re clutching at straws a bit those figures are on the assumption that your boiler is running perfectly and is set up perfectly. With the greatest of respect I bet it’s not. I think you might have to try plan b and we still don’t know what the requirements are of that shower head
  14. Chalked

    Chalked Plumber GSR

  15. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!


    Say your cold water is 10 degrees

    At 16.7 the water temp will be 45 dc at the boiler end up around 37-40 at appliance

    But you will never get 16.7 as there flow restricted to around 12
    • Informative Informative x 1

Users found this page by searching for:

  1. widest bore shower hose

Users found this page by searching for:

  1. widest bore shower hose