I moved into my new house with an A. O. Smith water heater. Within two months I begin having problems with loud noises when heating. Even called the fire department to make sure it wasn’t a fire risk.

ASHLAND CITY, TENN. — A. O. Smith Water Heater Co. has introduced its Vertex 90% efficient condensing residential water heater that the company said can produce "endless hot water." The 50- gal., ...