Manufacturer has introduced four new models – RUCS/RUS75 and RUCS/RUS65 for both indoor and outdoor applications - that expand its Ultra Series condensing line with mid- and lower-range maximum Btu units. These new models offer condensing efficiency and a lower price point for installations that don’t require high Btus, such as smaller single-family homes and multifamily residential projects. Features of these new models include lower Btus (160,000 Btu for RUCS/RUS75; 130,000 Btu for RUCS/RUS65), concentric/dual-pipe venting options, and status monitor control, while delivering on our standard endless supply of hot water, Energy Factor (EF) of up to .93, space savings and environmental benefits.