My take on this debate starts with what the fuel sources for your electricity is. If you burn mostly coal to make electricity in your area, then use high efficiency gas as your backup but if there is a high degree of solar/wind/gas used to make power then I would use solar with an electric backup.
Either way, nothing compares with a cheap 55% gas tank on cost but should that be the baseline? If so, you will never get close to it doing a solar system.
Personally, I would get a well insulated electric tank, put one of the DIY 1 ton heat pumps on it for cheap. Add solar after if you want.
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