Water Heater Brochure

Multi-UNIT* Up to 20 units Up to 20 units Up to 10 units
Maximum input (BTU/h) 3,980,000 3,980,000 3,800,000
A. O. Smith tankless water heaters have the capability to link multiple heaters together to act as a system. The
primary heater is rotated to ensure even operation of all heaters. The 510U/C, 540H, CT-199, and 910 models can
EASY-LINK
TM
up to four units using included communication cables.
For even larger applications the 510U (series 200), 510C, 540H, CT-199, and 910 models also feature the Multi-
Unit System, allowing a greater number of units to work together as an integrated system using a Multi-Unit
System Controller. The Multi-Unit System can control up to twenty 510U (series 200), 510C, 540H, and CT-199 or
up to ten 910 heaters.
Unit Comparison
Common Venting
The A. O. Smith common venting system utilizes fewer
unique components so you can design your venting
based on project requirements.
• More design flexibility
• Fewer wall penetrations
• Able to use schedule 40 PVC on intake and exhaust
• Heaters don’t de-rate when common vented
• Design doesn’t override redundancy benefits
MULTI-UNITS SYSTEMS
*Requires Multi-Unit Controller: 100112691
510U/C Series 540H/CT-199 Series 910 Series
EASY-LINK
TM
(No Controller Necessary) Up to 4 units Up to 4 units Up to 4 units
Maximum input (BTU/h) 796,000 796,000 1,520,000
40