When it comes to buying water heaters, A.O. Smith water heaters are a brand your business can trust. Lowe’s carries a variety of A.O. Smith hot water heaters, including commercial units. Here you’ll find both A.O. Smith gas and electric water heaters in 40-gallon, 50-gallon and 75-gallon options. If your job requires a high-recovery water heater, then the A.O. Smith Promax and the rest of the signature premier water heaters are great options. A.O. Smith water heater warranties range from six to 10 years, so you know they’re built to last. That’s one of the reasons why the majority of A.O. Smith water heater reviews are five stars. And if the job requires a simple repair, we carry a host of OEM A.O. Smith parts and accessories.