Cheap fan that was causing the noise. Benefits After installation and the noise issue was resolved, I was left with a hot water heater that should last at least 10 years, is much more efficient than a gas water heater, and should pay for itself in about seven years. In addition to the cost savings, I also get the satisfaction of knowing I am reducing my environmental footprint. With the generous rebates, I can confidently say that I have made a great decision. The world is in the middle of a climate change crisis and anything a homeowner can do to reduce their carbon footprint is a great step in the right direction. I hope this article helps others understand the technology and the benefits of a hybrid Electric water heater.