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