Pumped hot water / cold mains to shower

[Reltub]

Hi guys,

Been to look at a job and they want a new boiler, incoming mains is too low for a decent size combi so putting a system boiler and y plan in. They currently have a st monsoon 4.5bar single impeller pumping the whole hot supply but the shower is fed straight from the mains, from experience I have had the cold main forcing up through the tanks and causing them to overflow and damage the shower. I have advised they need a twin impeller pump for the shower and leave the rest of the hot gravity fed.

- Is this the best idea as I am questioning whether this is right because the pumps specify they can be used alongside cold mains for a shower.

- The cust has a shower/bath tap with a shower head she uses to rinse her hair so removing the pump from the hot would prevent her from doing this.

So will I be ok to leave it as it is or would it be better for them by preventing the shower from failing?

Or will they be better off just having the shower pumped and living with the bath/showeer tap on gravity.

Regards

 

[Ermintrude]

Put bath on grav but supply it with a cwsc cold supply. Shower defo two singles or one. Double. Anything else is absolute nonsense.

 

[Ermintrude]

Put bath on grav but supply it with a cwsc cold supply. Shower defo two singles or one. Double. Anything else is absolute nonsense.

But that's just me , could put bath on pump too?

 

[Reltub]

But that's just me , could put bath on pump too?

Good idea would this be suitable?? Or any other ideas would be appreciated.

Thanks

 

[mfgs]

I wouldn't want a pumped hot and mains cold, it will cause issues as it wont be balanced. I would try and convert at least the shower to both being pumped.

 

[BLOD]

Imoh always go for balanced hot & cold on showers. If you put it in then you're the one they're going to call when it's not working right!

 

[solutions]

Agree only ever supply balanced supplies to any mixer unless completely unavoidable. (Ps. its never unavoidable)

 

[Reltub]

Would i be ok having pumped hot/cold going to shower and bath tap

 

[mfgs]

Yes, that will be fine.

 

[solutions]

Would i be ok having pumped hot/cold going to shower and bath tap

Yes. But pump must draw its water from tanks and not the main. If supplying a shower there should be a seperate hot feed from the cylinder to the pump and a seperate cold feed from the cold water storage tank to the pump than allready supplies low pressure hot and cold to the rest of the property. The cold connection to the cwsc should also be bellow the bottom of the hot cylinder feed connection to the cwsc.

 

[Reltub]

Yeah sound gonna quote to do that then, remove single impler, fit twin and another 25gal tank kn loft, hot/cold feeds to pump from cyl and tank, then pump hot cold to bath tap and shower

 

[WHPES]

You are best to get a pump which is suitable for pumping to the taps as some of the cheaper ones can fail if you just have one tap open and the other shut with nowhere for the water to go to.