Plumber
If you want a water heater with extended warranty, choose one made by Rheem. The extended warranty will add four years to the limited warranty, and can cost between $150 and $200. The warranty will vary according to the series of your HVAC system. For more information, visit Rheem's Homeowner Resource Center. You'll find downloadable guides, Frequently Asked Questions, and even serial number locators. Rinnai - A Rinnai electric water heater uses a small computer to control the heating process. You can set a desired temperature and enjoy hot water all day long. The unit adjusts the water flow based on the temperature of the incoming water as the weather changes from summer to winter. The heater also has a modulating gas valve that controls the power and increases or decreases the flow of water accordingly. This feature makes it the most convenient heater for busy households.