Rheem vs Rinnai: Rheem and Rinnai are two of the biggest competitors when it comes to tankless water heaters, and both companies make great products.
Rheem provides options for electric tankless water heaters, but Rinnai only offers gas electric water heaters. Rheem also tends to have a lower price tag than Rinnai. Rinnai offers some benefits when it comes to reliability and added features.
Rheem vs A.O Smith: Again, Rheem and A.O. Smith both offer great options, and both brands rank closely in most areas. Rheem provides a lot more variety and easy-to-use products with a better warranty. A.O. Smith excels in efficiency and slightly beats Rheem in customer service.