hi anyone,i want to fit a pump for a shower cubicle with shower and jets,the plumbing all seems to be in good order.the cold water tank is in the attic but not directly above the shower, it will need a horizontal run of approx 3m then a vertical run to the pump of about 1m,the hot water tank is in the airing cupboard next to where the shower will be fitted. the hot water tank is a good size but not sure of exact size?how do i work out the size of pump i will need??
power shower pump what size and where to fit
- Thread starter andrea4g
- Start date
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The size of the pump depends on what sort of shower unit you go for, it should state in the MI's what bar of pressure is needed.
You will need a 50 gallon (225 litre) cold water storage cistern in your loft (if you don't already have one). If the cold supply for your pump needs to be run across the loft before dropping down to your pump, it would be advisable to raise your tank up on a tank stand. If you don't, this can sometimes cause air locks in your pipework if there isn't enough head of water.
The hot and colds should have their own dedicated supplies for the pump.
You will need a 50 gallon (225 litre) cold water storage cistern in your loft (if you don't already have one). If the cold supply for your pump needs to be run across the loft before dropping down to your pump, it would be advisable to raise your tank up on a tank stand. If you don't, this can sometimes cause air locks in your pipework if there isn't enough head of water.
The hot and colds should have their own dedicated supplies for the pump.
thankyou 4 ur reply 
is there a minimum size for hot water cylinder@ also would connecting the cold about half way up the cold water tank to create more head give less chance of air locks?
is there a minimum size for hot water cylinder@ also would connecting the cold about half way up the cold water tank to create more head give less chance of air locks?andrea4g said:thankyou 4 ur reply
This will not help. head remains the same but you will run out of water sooner and get air sucked in. Connect at same level as cold feed to hw cylinder
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thank u 4 the info, there is another problem, the hot water runs really slowly. could i fit a low pressure pump on the cold water feed to the hot water cylinder. or is it not possible to have two pumps on a system.
cheers.
cheers.
The new shower pump that you will install should have a twin impellor ie will pump the hot and cold to your new shower unit.
The cold will need to come direct from the cold tank in loft and the hot will need to come direct from the hot water cylinder via an essex or surrey flange so it does not affect your normal hot taps when working and also s as not to suck in air from the open vent.
You could also fit a 'bronze' booster pump to the hot take off pipe to the rest of your hot taps seperatley.
As previously answered to you you will need a 50 gallon tank or 2 x 25 gallon tanks linked together in loft to maintain an adequate supply for the shower etc.
The cold will need to come direct from the cold tank in loft and the hot will need to come direct from the hot water cylinder via an essex or surrey flange so it does not affect your normal hot taps when working and also s as not to suck in air from the open vent.
You could also fit a 'bronze' booster pump to the hot take off pipe to the rest of your hot taps seperatley.
As previously answered to you you will need a 50 gallon tank or 2 x 25 gallon tanks linked together in loft to maintain an adequate supply for the shower etc.
thank you for ur advice dave
cheer
cheer
where would i fit the essex valve to on the tank i mean how close to the top cheers .
gas4you said:andrea4g said:thankyou 4 ur reply
This will not help. head remains the same but you will run out of water sooner and get air sucked in. Connect at same level as cold feed to hw cylinder
The cold feed from the CWST should be below the feed to the hot cylinder, otherwise there is a risk of scalding if the tank runs dry when showering.
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