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foxy · Joined: 21 Feb 2008 Posts: 42 Location: london

hello
as I will be installing a shower pump, I know I need at least a 50 gallon cold water tank.My present one is about 25 gallon.I had planned to replace it with a 50 gallon tank.My thinking is that I should put the new 50 gallon tank close to the old tank and join then together giving a much bigger storage and little chance of the hot water cylinder and pump starved of water.So my question is how do I do it?or should I just buy a bigger cold water tank.

any advice gratefully received

thescruff · Moderator Joined: 03 May 2003 Posts: 4755 Location: Bath

Depends how good the mains pressure is and what size pump you are buying.

Problem with your plan is both water levels must be the same so the smaller tank would need to be raised to suit.

I think you should have a minimum 70-100 gallons for any duel pump

foxy · Joined: 21 Feb 2008 Posts: 42 Location: london

thanks for your reply
the shower i have ordered is the amber helix with a diverter which requires a minimum of 2.0 bar at the head.the matching mono sink tap I have been advised should alsobe connected to the pump on the hot water side,leaving the cold connected to the mains for drinking water.I have ordered a salamander 2,25 bar whole house pump.The pump needs at least a 50 gallon cold water supply tank.what do you think?

thescruff · Moderator Joined: 03 May 2003 Posts: 4755 Location: Bath

As I said it depends on the mains pressure and the recovery rate of the storage tank.

Is the new tank 50 gallons actual or nominal.

I would go for the biggest you can get in the roof up to an 100 gallons

foxy · Joined: 21 Feb 2008 Posts: 42 Location: london

thanks scruff my problem is that the only tanks i have seem are 50 gallon size.Do yo know where I might get a 100 gallon tank and one that I would getb through a standard loft hatch?

thescruff · Moderator Joined: 03 May 2003 Posts: 4755 Location: Bath

No problem connecting two tanks together.

Connect the ballvalve in tank 1 and the outlets in tank 2 so you have a cross flow through the two tanks.

You could do that with the existing tank but the water levels must be the same, so the 25gall tank would need packing up to the height of the 50 gallon one

foxy · Joined: 21 Feb 2008 Posts: 42 Location: london

your a gent. thank you for your advice