Shower pump with a Combi Boiler?

[1966john]

Hi,

I am a apprentice plumber, I am doing my house up and want to boost the pressure of water coming out of my shower. The question is, my shower is fed from a combi boiler, so if I fit a booster pump to my shower, will it pump the water to the shower quicker than the boiler can keep up ?

cheers

 

[lame plumber]

cant put pumps on a combi, end of Im afraid, talk to your mentor and tutors!

 

[Phil_Plumb]

hell no back the truck up! cant be done as Lame ^^^^^^ says!

 

[Masood]

cant put pumps on a combi, end of Im afraid, talk to your mentor and tutors!

hell no back the truck up! cant be done as Lame ^^^^^^ says!

Disagree. You can't pump mains, but if you install a decent sized break tank, you can pump water INTO a combi.

I've got that setup at home, 200 litre tank, 3 bar single impeller pump, into a 24KW boiler. Works a treat. Got really good flow rate and pressure, balanced hot and cold.

 

[dancinplumba]

Yes you can pump mains !!
​Up to 12 lts/min or more with suppliers permission

 

[Dan Masey]

What boiler is it? Sounds like a lot of hassle to me. Upgrade the boiler?

 

[Masood]

Yes you can pump mains !!
​Up to 12 lts/min or more with suppliers permission

Yes I'm aware of that, but to be honest 12lts/min is not worth getting excited about. For any meaningful pressure, you can't pump mains!

 

[dancinplumba]

Yes I'm aware of that, but to be honest 12lts/min is not worth getting excited about. For any meaningful pressure, you can't pump mains!

Yes you can, with the suppliers permission

 

[lame plumber]

why bother with pumps at all, convert combi to system with an unvented cyl, whats the point of pumping a combi that cant warm the water quick enough to be of any use. I think people have gone off piste here, yes you can pump mains but why with a combi? the boiler cant cope with it properly in the first place to warrant doing it!

 

[Masood]

why bother with pumps at all, convert combi to system with an unvented cyl, whats the point of pumping a combi that cant warm the water quick enough to be of any use. I think people have gone off piste here, yes you can pump mains but why with a combi? the boiler cant cope with it properly in the first place to warrant doing it!

Well, like I said, a 24KW combi copes perfectly well with a3 bar pump, feeding a shower and sink at the same time.

And it's takes up a hell of a lot less space than an unvented, and costs a lot less than converting to heat only/unvented.

 

[dancinplumba]

It's the incoming mains that's at issue !!! Putting in invented or diff boiler won't do bugger all !!

 

[lame plumber]

It's the incoming mains that's at issue !!! Putting in invented or diff boiler won't do bugger all !!

true, so why doesnt some one suggest upgrading incoming main, oh I just did

 

[dancinplumba]

true, so why doesnt some one suggest upgrading incoming main, oh I just did

Cos no one is as clever as you

 

[JW Heating]

A mate of mine did it against my advice years ago. Worked a bloody treat! If memory serves he used a single impler pump after shower valve and before shower head.

Thanks

 

[vern]

A mate of mine did it against my advice years ago. Worked a bloody treat! If memory serves he used a single impler pump after shower valve and before shower head.

Thanks

A lot of pumps ain't rated for mains water, so best check the MI's, no way I would recommend a pump on a combi outlet by the way....seen one burst when a combi upgrade was done not pretty!

 

[Phil_Plumb]

No and i wouldnt either, if the incoming mains isnt enough then its down to supplier to upgrade it to legal standards. And tbh i wouldnt bother specifing a pump for a combi i would rather recommend a unvented + heat only boiler. Yes it takes up space, but what space you lose in one place you gain with having a smaller heat only boiler elsewhere.

 

[dancinplumba]

There is no comparison in space lost by having cylinder against the size of combi