On demand is a lot more expensive as well I already have a heatpump and electric range. all 3 at once could be pushing the limits of the service to my house. If I had gas/propane I'd have seriously considered an on demand though.
As well I intend to add solar one day and we be using this and a second identical tank as my storage.
heatpump makes no sense in my case since I spend the majority of the year heating the basement with a heatpump.
Insulating the tanks is simply. Just wrap it with insulation. I'm currently looking for an attic wrap tank blanket which is fairly common in the prairies. They sometimes put their hotwater tanks in the attic and then need to insulate the crap out of them to stop freezing in -40 weather. tanks almost always go in the basement here so we get thin insulation blankets...
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