Screwfix hot water cylinders - 10 year warranty cheaper than 2?

The house I was born in still has the same copper cylinder that was there when I was a child.

To avoid mixed metals and the resultant possible corrosion maybe?

Bit tricky unless you have copper rads I would have thought?

Nostalgia?

Old cylinders had a reasonable thickness copper (and are worth a lot nowadays as scrap). Over the years, they've managed to make them thinner and thinner. Modern ones with integrated insulation are not much more than a copper foil coating the inside of the insulation foam. A friend went to cut some foam away on a new one with a stanley knife, and went through the copper too. The rigidity is provided by the insulation, and when full, the water pressure too.

Andrew

I'm on the second copper one, went at a seem but lasted from 1939 to 1970. The newer one was a bit wider and needed a bit cut from a wooden strut to clear the tank. I'm not sure why the different materials, on the face of it the stainless, assuming it really is stainless would be better. Brian

No matter what circuit its in you will have mixed metals somewhere along the line, even if its only the tails of the taps. Could it be earthing conductivity for immersion heaters? Brian

Just read a comment that the connections are 22 mm and so not up to the 28 mm cold input required for a shower pump.

This could explain it?

Cheers

Dave R