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I would deffo get a cylinder with a high coil surface area, especially if you're looking to switch to a heat pump in the future. These are usually described as 'heat pump compatible'.
I've heard good things about Mixergy cylinders, which use clever stratification and plate heat exchangers, along with massive coil surface area.
Not sure if this is quite the right place, but…
We want to switch our vented hot water tank to unvented, fed by a condensing boiler, but with the option to heat using electric immersion too. We also want it to have the capacity to be fed via solar in the future (in case that requires something different to mains fed immersion).
Are there any brands we should be looking at/avoiding? There seems to be quite a range of prices, from about £650 to £1200 or so. What makes some better than others?