Some popular brands of gas heaters are American Standard, Lennox, Rheem and Carrier. These brands manufacture gas heaters that are ENERGY STAR certified and come in either single or multistage configurations.
American Standard offers a number of different lines of gas and oil furnaces, including the Platinum, Gold and Silver lines. The Platinum line of furnaces are rated higher for energy efficiency than the Gold and Silver lines. The company promotes its furnaces as having quiet operation. The company additionally manufactures air conditioners, heat pumps and air handlers.
Carrier manufactures three lines of furnaces: the Infinity, Performance and Comfort series. The Infinity series includes the company's top-of-the-line models. Carrier additionally manufactures boilers, oil furnaces, air conditioners and heat pumps.
The lines of gas furnaces manufactured by Lennox include the Dave Lennox Signature Collection, the Elite series and the Merit series. The company's website includes user reviews and ratings. Lennox also manufactures oil furnaces, air conditioners, heat pumps, boilers and air handlers.
Rheem gas furnaces come in four lines: Prestige, Classic Plus, Classic and Value. The company offers both 80 percent efficiency models and over 90 percent efficiency models. Rheem also manufactures water heaters, heat pumps, air conditioners and oil furnaces.