Hello everyone. I am looking for a bit of basic advice on hot water tanks. I currently have a warm air heater that heats up the water in my tank via a heat exchanger. The tank is now very old and does need sorting out. I am getting a brand new, unvented tank as a replacement, with an immersion heater included for back up purposes. I don't really know much more than the basics about this subject though. I wondered if there is much of a difference in the quality of tanks available on the market? I obviously want to get something that is very good quality and will last a very long time. I would far rather tell my installer what to get me, than leave it all down to him. Not that would I expect to get junk, but I am sure everyone can appreciate where I am coming from here. Any other tips or advice would also be greatly appreciated. For example, are there any special features I should know about? Thank you.