Rheem and A. O. Smith - two global leaders in water heating technology - are offering the four main types of water heaters 1) tank-style and 2) tankless gas heaters, 3) solar and 4) electric (hybrids-heat pumps, regular and small electric point-of-use) under their own brands or under third party labels.
Rheem and A. O. Smith
Some models are mainly sold to builders and independent retailers and plumbers, but GE, American, Kenmore, Maytag or Whirlpool also sell their water heaters in big improvement stores (GE: Home Depot; Whirlpool and Maytag: Lowe’s; American and Kenmore: Sears…) or online (Amazon.com).
Other water heater manufacturers
Other big players in the water heaters market: Bradford White, Bosch and Ariston (point-of-use electric water heaters); Vaillant, Junkers/Bosch and Vulcano/Bosch (in Europe, the last two), Navien, Rinnai or Noritz(tankless water heaters).
Solar water heater manufacturers
Rheem (Cirrex Series), A. O. Smith (SolPak and Solaraid series) and Bradford White (EcoStor) are now also selling solar water heaters.
To find a certified contractor in North America, see: North American Board of Certified Energy Practitioners (NABCEP). See: Solar Panels Manufacturers.