Thermostatic Shower/Boiler Confusion

[rad_pete]

Hi all

Im thinking about putting a thermostatic shower in but am curious about a couple of things i've seen on the various posts.

1) People seem to have issue with regard to boiler sizing, will a thermostatic shower work ok with my vokera compact 24 or is it too small a boiler?

2) What do people mean by modulating boiler, how do i tell?

3) Im thinking about the concealed type of shower, just how deep does the chanel need to be? simply deep enough for the pipework?

Thanks

 

[SimonH2]

EDIT: Assuming it's a combi ...

1) If the 24 is the capacity then it'll run a shower (as long as you don't want it too hot and/or too high a flow rate). Don't expect to be able to fill a bath and have it ready before it's gone cold though.

2) Most (all ?) modern boilers modulate these days. Older boilers were either on or off - and if run at part load they had to turn on/off frequently. Modern ones can run at a range of powers - anything from about 1/3 power (or less ?) to full.
This means they don't need to turn on/off as often (good for efficiency when running the heating), but it also means it can run a shower directly without going hot-cold-hot-cold as it fires and then turns off.

3) Deep enough for the valves (if the valves are flush mounted), and the pipework and fittings.

 

[rad_pete]

thanks for the reply. looks like the 24 is the max kw output.

the reason i aks about the depth of the channel required is becasue it would need to go on a single skin block wall. am thinking it may be a little tight!

ta

 

[SimonH2]

If you can spare the space, then battening out a false wall is a common technique.

My mates bathroom :

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[rad_pete]

nice job simonH2.

yeah, i think i can probably spare 50mm which might do it coupled with a bit of a channel.

im now just wondering if my boiler will be powerful enough. it is the vokera compact 24 combi and to be fair, i get a fair old rate of very hot water coming out of the bath taps so im not sure i would see a reduction in pressure coming in through a shower.

anyone else got a thermostatic shower running off a combi thats on the smaller side?

thanks

 

[SimonH2]

It should do fine for a single shower.