Shower pump help

Pdbaggett

OK, so I recently installed a shower pump to boost the hot water pressure in the entire house as its gravity fed for hot and mains for cold. So all went OK installed the pump after the outlet of the hot eater cylinder. Everything works fine all taps down stairs and the main bathroom ect..... However, it turns out and i have no idea why it would ever be like this but the shower in the ensuite is also gravity fed from the cold water tank in the loft; the toilet and sink taps are still on mains pressure.

Due to the difference in pressure for the shower its still basically a trickle unless the hot is fully open but then its to hot to shower.

So my options are.... Can I t off from the cold mains pressure supply in the loft to feed the cold mixer in the shower, the problem being its only 15mm so I'm not sure if that would he sufficient to supply both the shower and keep the cold water tank topped up at the same time.

Or... Install another shower pump in the loft between the shower and the cold water tank effectively boosting the cold water to the shower mixer.

Any advice ? Hope that was easy to understand :eek:

EssexExile

I'm not sure I understand what you've done but a pumped shower normally has it's own dedicated pumped supplies from the hot cylinder & cold tank just for that shower. Then, whatever anyone does with taps elsewhere the shower isn't affected. So you need a pump that pumps the hot & cold just for that shower.

Pdbaggett

A twin pump isn't an option as the cold to the shower and hot are very far apart so short of ripping the shower out fully that's not going to be an option.

I installed a negative head shower pump from the outlet of the jot water cylinder as per the instructions of my pump and the advice of salamander as this can work when meeting with mains pressure .

I'll just connect the cold fees to the mains cold for the shower and see if that's OK seems easiest to do.

Ganga

Pdbaggett wrote: »

A twin pump isn't an option as the cold to the shower and hot are very far apart so short of ripping the shower out fully that's not going to be an option.

I installed a negative head shower pump from the outlet of the jot water cylinder as per the instructions of my pump and the advice of salamander as this can work when meeting with mains pressure .

I'll just connect the cold fees to the mains cold for the shower and see if that's OK seems easiest to do.

But if someone turns a cold tap on somewhere else in the house you could get scalded :eek:

Heedtheadvice

Run both hot and cold Los pressure feeds to a common point and install twin pump. That way you will supply the shower with hot and cold at very similar pressure and enable proper temperature control.

Pdbaggett

The pump is rated at 2 bar and the incoming cold pressure is 2 bar so its pretty much equal anyway hence why I bought that specific pump

Pdbaggett

OK thought I would update this as there is not much on Google ect for boosting hot fees gravity fed systems to the whole house.

I purchased a 13 year old house this year which is great but on moving in released the hot water is gravity fed from a vented hot water tank which means the shower was a trickle and the nice modern mixer taps I wanted where basically a no go at this point.

So... I searched for a way to increase the water pressure from the hot water tank outlet that supplies the whole house (every cold outlet to the house is from mains with a pressure of 2-3 bar except the shower in the en-suite). With a bit of research and help from salamander I purchased a ct force 20 su a 2.0 bar rated negative pump which can be used to boost the outlet from the hot water tank that feeds the whole house and is fine to use when the cold is mains.

After being fitted the shower in the en-suite which was still gravity fed to the cold from the water tank in the loft needed to be connected to the main cold which was easy enough to do.

Anyway long story short if you want to boost the hot water to the whole house from your hot water tank and the rest of your cold is mains pressure you can do it with one single impeller pump on the outlet of your hot water tank.

Hopefully that helps someone in the future as there isn't a great deal of information about boosting this setup when I searched initially