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You are getting a great price on natural. I am sure that you can get these units set up for natural gas. I don't have that option and don't use gas for any other use. Still 60 dollars a year for the luxury of having a hot shower is priceless.
One thing to keep in mind is that the water isn't generally blended with cold water. We set it at the temp to the needed temp right at the heater.
The efficiency of the hot water heater has to be titrated on the energy it takes to keep the water warm in the tank.
For rental I would just get a standard tank style heater and let the tenant pay the bill.
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