Thanks gasbanni, I had to change a leaking Oso a couple of years ago under warranty and they paid me £200 to do it.
It was only three years old and I am reluctant to fit one now
The Vaillant uniSTOR is good, easy to install and looks nice.
However, the Spanish motorised valves supplied with them are crap so I chuck them and fit Honeywell.
Which unvented cylinder do you recommend?
I've fitted ariston in the past but I'm sure there are better ones on the market.
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