two 25 gallon cold tanks

[ajrobb]

I want to fit a power shower but I don't have height in the roof space for a 50 gallon tank. Can I fit two 25 gallon tanks instead? If so, how should they be connected?

I was thinking of a single ballcock in the first tank with a 28mm pipe between the bottom of the tanks and taking all feeds from the second tank. Another alternative is a ballcock in each tank then taking hot cylinder feed from one and cold feed from the other with a balance pipe between the tanks.

 

[Agile]

You will get a faster refil if you have a ball valve in each tank.

Tony

 

[ajrobb]

The preferred solution seems to be two tanks, two ballcocks. One tank feeds hot water and the other feeds cold. Balance pipe between the tanks to equalise water levels?

If I run the hot tank at 70°C, then that needs cooling by 32°C down to 38°C shower temperature. Coldest water at 5°C needs heating by 33°C up to 38°C. So, pretty close to 50:50 split between hot and cold feeds, which should work well with two cold tanks. A balance pipe wouldn't have to take much flow.

 

[TicklyT]

Have you considered a 'coffin' tank? They are the shape the name suggests - very useful if headroom is restricted.
http://www.screwfix.com/search.do;j...OCFFI?_dyncharset=UTF-8&fh_search=coffin+tank

Edit - with two tanks, the preferred setup is inlet(s) in one tank, balance pipe(s) between, and outlets from the other. That avoids water stagnating in one of the tanks.

 

[ajrobb]

I have ordered a coffin tank with byelaw kit. Can I run the warning overflow internally into a tun dish connected to a washing machine drain under the cylinder or even over a shower tray?