If you are trying to go solar, there are many good solar systems out there that have electric elements as a back up, and even ones with gas burners for back up. Jomar has a good one. I'm a Tankless guy, prefering Rinnai and Noritz. However, I can see in some places and situations where a solar system would be very attractive. in that situation, the thing to avoid (my opinion) is having to buy TWO complete hot water systems! In other words...pick one. Pick a good one, have it installed properly and enjoy!