Rinniai RUCS651 130K BTU 6.5 gpm Tankless Water HeaterDescription The Value Series delivers the ideal combination of comfort and value. This compact unit has all the reliability expected from Rinnai for medium to smaller sized homes, especially in warmer climates. Features ENERGY STAR qualified Energy factor of . 82 Certified for installation in manufactured (mobile) homes Leak detection shuts off water to unit to limit property damage Enhanced scale detection lessens possibility of serious, long term