Tim,
How much did the electric unit cost? That is almost ideal for my church to use; since we only use a very small amount of hot water once in a while.
On the gas units, I'm told that in Australia, they have a solution for the ignition that does need any external electricity source: a small impeller is installed on the intake water line, which spins a small generator as soon as the water is turned on -- and the electricity generated ignites the gas, and you get instant hot water... Pretty slick, I'd say.
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