installing a pump

[GTM]

Hi all,

I am doing a job for a friend that envolves fitting a rain head traditional shower, I can clearly see that when it's fitted there isn't going to be enough water to make the rain head perform at all, so fitting a pump is in order

I've done this before in my apprenticeship but it was along time ago, it was also in a commercial building it was fitted

I thought it was be a case of installing a shower pump on the hot and cold feeds to the shower and job done...

I did a little searching just to reassure myself this way the case and have found this not too be the case...

I'm finding that this can't be done with a combi boiler (which is what she has)

This makes sense thinking about it because I don't want to be starving the boiler of cold water, or trying to pull to much water through the boiler

So the logical way forward is too pump the whole lot after the incomming stop tap

Will this work? Is it legal?

I'm trying to find out the maximum flow/pressure that is ok to put through the boiler but I'm not having much luck

What should I be doing in this situation?

Many thanks

 

[tommy1712]

What's the water pressure?

 

[oz-plumber]

You should be able to put 500 kPa maybe 600 kPa through the combi without any problems.

As for flow - it will depend on the temperature rise you require through the heat exchanger.

The higher the temperature required the less flow you will get through the combi.

As per your regulations about installing a pump close to the stop tap - I don't know.
Cannot see it being a problem - you can attache pumps to the outlet side of water tanks/

 

[Plumbstar Tom]

the combi will still slow the water down to heat it up.
The shower will work as it is but it probably wont give a powerful shower from it

 

[greg27]

You can get a booster for the main now from grundfos,(screwfix for £300 ) , never fitted one tho and havent read spec so mighyt be an idea

 

[Mike Jackson]

The mains booster pumps will supply up to 12l/min. You need to check the spec of the shower to see what it needs. Also check the boiler to see if it will provide enough hot water. If you need more than 12l/min you're looking at fitting a break tank and a pump.