Can I fit a shower pump on a Combi system?

ottosump · 24 Apr 2018

Hello group, just a quick question.

Can I fit a pump to a thermostatic shower that runs from a Combi boiler.

I have a Vokera Syseti 35 boiler, plumbing and electrics are easily accessible, would just like more oomph from the shower head.
TIA Otto, in a damp West Cumbria

Dan Robinson · 24 Apr 2018

ottosump · 24 Apr 2018

Is there a reason?

Mottie · 24 Apr 2018

If he told you that, he’d have to kill you.

oldbuffer · 24 Apr 2018

1. It is against the Water Regulations to pump the cold main at more than 12 litres per minute.
2. You might over-pressure your boiler.
3. A combi won't heat more than its maximum specified flow of hot water at a given temperature rise no matter what you do.
4. You could consider replacing that brass isolation valve (rhs of your picture, probably the hot) with a full bore one. Get rid of the PTFE on the threads at the same time.

Hot&Cold · 24 Apr 2018

ottosump said:
Can I fit a pump to a thermostatic shower that runs from a Combi boiler.

Your combi has a hot water flow rate of 12 lpm,iirc vokera do as a spare part a 13 lpm restrictor. That would give a little more flow but your shower mixer valve and shower head could also have a means of restriction.(either intended in design or due to being a Chinese import product).

12 lpm from your combi matched with decent cold mains water flow and a decent mixer valve-shower head arrangement will give a decent invigoration shower as long its plumbed in correctly with no restrictive flow fittings.

heatservice · 24 Apr 2018

Your electrics dont look too clever entwined with you plumbing as they are.

DH6 · 24 Apr 2018

That's the best shower fixing kit I've seen in my life!!

ottosump · 24 Apr 2018

I didn't fit the shower nor the electrics (they are what's left over from an electric shower I presume (they are dead)), I was only looking for advice.

Bodd · 24 Apr 2018

ottosump said:
Hello group, just a quick question.

Can I fit a pump to a thermostatic shower that runs from a Combi boiler.

I have a Vokera Syseti 35 boiler, plumbing and electrics are easily accessible, would just like more oomph from the shower head.
TIA Otto, in a damp West Cumbria
View attachment 140847

You can have a shower pump that runs to a combi but not from a combi

Dan Robinson · 24 Apr 2018

Bodd · 24 Apr 2018

Dan Robinson said:
eh?

If he has a break tank he can.

Dan Robinson · 24 Apr 2018

Not likely though eh

.

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Can I fit a shower pump on a Combi system?

Hot&Cold

Bodd

Bodd

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