Double immersion hot water tank.

[Pauldicker]

Dear all,
Has anyone come accross a double immersion hot water tank. How did you supply it 2x16A circuits. Maybe a 32A circuit split into 2 with 2x 20A double pole switches. I have only come across singles before, so im trying to find the best solution as i only have 1 spare way at present.

 

[Deleted member 26818]

The switch shown, just switches between elements.
There are some switches for use with off peak tariffs, that will allow both elements to be on at the same time.

 

[Toneyz]

I see what your saying. But will this work both 3Kw elements or just one requiring two switches. And is it rated as a 40A switch if both elements are working.
Ive not seen this switch before.

It only allows one element on at a time.

 

[Pauldicker]

It only allows one element on at a time.

Ok cheers.

 

[Toneyz]

I think as posted the best solution will be a 32A supply to a 2way consumer unit feeding each immersion via 16A MCB.

 

[Blissof89]

Its a pretty sad state of affairs when FCU's are burning out before the 13A fuse in them pops IMO.

A FCU SHOULD be up to the task really but I understand people's concern, I've never seen one burnt out by immersion load myself but I have heard of it happening.

32A submain feeding 2 x 16A radials would be the ultimate solution but trying to convince customer he needs and extra DB just to feed his emergency back up immersions might leave a sour taste.

 

[Pauldicker]

Its a pretty sad state of affairs when FCU's are burning out before the 13A fuse in them pops IMO.

A FCU SHOULD be up to the task really but I understand people's concern, I've never seen one burnt out by immersion load myself but I have heard of it happening.

32A submain feeding 2 x 16A radials would be the ultimate solution but trying to convince customer he needs and extra DB just to feed his emergency back up immersions might leave a sour taste.

Luckily its a mate, but i agree with you.
Its a pain in the butt, but i will probably use 20dp switches, From a 32A feet into a cu as im not sure i will be overloading adding another 32A on the board.
I have a garage to supply power too so may install a second split load board.