thermostatic mixer shower choice

[shd1970]

I am looking to replace my triton electric shower as its not the best, with a thermostatic mixer shower
I have a Worcester Bosch 37cdi boiler which today I tested can kick out 11 ltrs per minute hot water from the closest taps...those on the bath.
The quoted manual says 15 ltrs HW but I guess 11 ltrs would be ample, yes, or is it worth me understanding why the 4ltr drop ? Would distance from boiler be responsible and possible some 22 down to 15mm pipework too ?

Cold water pressure is very good

Grohe`s obviously get good press but all in all, are they worth the extra money or are there better/cheaper alternatives ?
Also, I am keen to understand ease/difficulty of fitting a thermostatic mixer shower for a competent diy'er happy with doing most plumbing

 

[Burnerman]

Grohe, Mira, Aqualisa, Triton all have good spares back up, and you'll be able to get parts for a good while, but I'll let someone else tell you if the boiler can provide the quantity of hot water! Please don't fit some cheapo oriental rubbish - it'll come back to haunt.
John

 

[shd1970]

Thanks for the reply burner man
The plumber who fitted the boiler advised us we only needed the boiler below the 37cdi and it would be more than ample but we deliberately upgraded with the intention of having a shower direct off the boiler rather than an electric one
Hopefully someone can chip in with their experiences and knowledge

 

[PullerGas]

Grohe, Mira, Aqualisa, Triton all have good spares back up, and you'll be able to get parts for a good while, but I'll let someone else tell you if the boiler can provide the quantity of hot water! Please don't fit some cheapo oriental rubbish - it'll come back to haunt.
John

While I have the greatest respect for Burnerman, I disagree, if you fit a Bar Mixer type shower, buy as cheap as you can find - they're a throw away items & can be replaced in two minutes.

Some years ago I fitted £18 bar mixers I bought in Lidl into a smallish B&B. Some years later they're still good strong. There's filters & ISO valves just incase they go t.ts up of course.

 

[Burnerman]

For sure, if there isn't any tiling issues involved you can't argue against that one!
I've had wee problems with spacing and leaks in the past so once installed I tend to leave them be
John

 

[shd1970]

Cheers for the replies pg / bm

Can either of you add anything regarding piping....presumably they just need a 15mm taken from the nearest hot and cold ?
Also non returns look to be built in as standard, yes, so only advice would be isolation valves ?

 

[Burnerman]

Yep, that's about it.....go for full bore isolators though.
John

 

[longdogs]

buy as cheap as you can find - they're a throw away items & can be replaced in two minutes.

The last B&Queue one I fitted for a customer didn't last two minutes
Then they tried to tell me that I couldn't get my money back because it had been used.