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Hey I have a dumb question I can find the answer too, if you might oblige one, I think the answer is they are they are basically the same. But what's the different between an unvented direct cylinder (electric only) and an immersion heater. Here we don't see ones like the gadhill, but two ports on bottom and no need for expansion vessel. The gedhill seems a bit fancier with two elements.
Ie.
https://www.ariston.com/es-es/productos/termos-y-calentadores/electrico/pro-b-v-h
Yeah they are decent, tbh im of the opinion that they are all a much of a muchness unvented cylinders especially the decent brands anyway.