[. . . ] [. . . ] With sealed combustion, a 3 vent, and the ability to vent either horizontally or vertically, the GWH 635 ES can be installed almost anywhere. Ships complete with wall mounting bracket, pressure relief valve, condensate drain kit, built-in electronic temperature controls and equipped with 120V power plug-in power cord. CERTIFIED ® 635ESSS_0306 [. . . ] [. . . ]