They are available as a "standard" model from most cylinder manufacturers but not always listed by merchants.
There is at least one cylinder manufacturer which will make "specials" at little more that the standard price.
I cannot remember which though but it may be the one in Birmingham. That can be quite useful when you want an extra heating coil for solar etc. That can be quite a lot cheaper than the "resellers" who seriously load the price for anything with the word solar in the title possibly because of the grant aid which is usually used.
I had trouble explaining what I wanted at a plumbers' merchant when I tried to buy a cylinder that size a few years back, until I pointed to one in the back of their store shed. Then the guy behind the counter said "Oh - You want a torpedo! That's what we always call them - Why didn't you say so!"
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