- Hot water is generated upon demand
- All models are ENERGY STAR® qualified
- Ultra-Low NOx Condensing technology provides unprecedented 0.95 energy factor
- Primary Heat Exchanger is constructed of HRS35 Commercial-Grade Copper which is more resilient against erosion
- Continuous maximum flow rates up to 10.0 GPM
- Easy-Link up to 4 units (540 Model only) with no additional parts or accessories
- Multi-Link up to 20 units (540 Model only)
Tankless
