shower bar mixer not producing hot water

[finest1]

Are the flow rates the same as the other taps I only ask as you say the hand held is hotter so it could be down to the boiler max flow rate(and temp rise) now in winter etc

how can i determine this? i have a Worcester bosch greenstar 30 CDI

 

[ShaunCorbs]

how can i determine this? i have a Worcester bosch greenstar 30 CDI

Test the flow out of each eg known capacity container eg 5 litres

Let’s say it takes 30 seconds to fill that 5 litre container up so that’s 0.1667 litres per second times by 60 gives you 10 litres per min

 

[finest1]

Test the flow out of each eg known capacity container eg 5 litres

Let’s say it takes 30 seconds to fill that 5 litre container up so that’s 0.1667 litres per second times by 60 gives you 10 litres per min

Hello Shaun, i did it slightly different. i measured the amount of water in 6 seconds and x by 10

i did one downstairs and one upstairs. i got 0.9-0.95 in six seconds (just under a litre) which makes 9-9.5 litres a minute

 

[ShaunCorbs]

And out the rain head ?

 

[finest1]

And out the rain head ?

hello Shaun please see my findings:

hand basin next to the shower : 4L a min
hand held shower attachment: 5L a min
rainfall shower: 1L a min!

note: even though the hand basin is lower than the rest of house it can run piping hot, and as its a smaller basin, i like the flow as otherwise it will just splash everywhere when you put your hand under.

thanks

 

[ShaunCorbs]

Would say your method is off as 1lpm through the rain head is wrong

 

[finest1]

Hi Shaun, yes you are right, checked again. i got 6L pm this time (600ml in 6 secs)

 

[ShaunCorbs]

If you restrict the rain head does it get hotter eg don’t open it fully 3/4 etc

 

[finest1]

If you restrict the rain head does it get hotter eg don’t open it fully 3/4 etc

Hi Shaun well this is strange:
1/4 turn shower gets hot for about 20 secs then backs off slightly. it feels like its just about to get hotter to piping but backs itself off
1/2 turn: same
3/4 turn: same
full on: gets hot for about 20 seconds, but backs off to warm!

so it seems that the shower is "regulating" the temp itself?

 

[ShaunCorbs]

Hi Shaun well this is strange:
1/4 turn shower gets hot for about 20 secs then backs off slightly. it feels like its just about to get hotter to piping but backs itself off
1/2 turn: same
3/4 turn: same
full on: gets hot for about 20 seconds, but backs off to warm!

so it seems that the shower is "regulating" the temp itself?

Can you advise make and model you’ve bought ?

 

[finest1]

Can you advise make and model you’ve bought ?

Hi Shaun shower link

is there any tweaks that need doing to the boiler maybe?

 

[ShaunCorbs]

Have you got a thermometer ? That you could check the temp ?

 

[finest1]

Have you got a thermometer ? That you could check the temp ?

No Shaun, not that I can think of..

 

[finest1]

hi Shaun, i had a thought. has boiler pressure got anything to do with it? when i got the loft extension in 2020/21 i think my boiler was set to 1.5bar. then i had some radiator work done, including a power flush and it was set at 1.2. i remember the plumber saying that 1.2-1.5 is fine. however, then the shower was out of action and i just kept it at 1.2 ever since. now shower is back, i'm wondering if bar pressure needs reviewing. it's around 1.1 at the moment

 

[ShaunCorbs]

No above 1 bar is fine either way