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I have heard that tankless water heaters are more effecient, therefore cheaper on utility costs. How much would I save in a year on my gas bill? 50%? 30% 75%? Would it be worth switching? My water heater is only about two years old.

First you need to figure out what size of tankless water heater, because they need to be right capacity for your home, They have gotten cheaper over the last few years, as they are becoming more common, and the cost of the unit and installation will help you determine if it is worth it to you