Brochure

510 Series 510U/C Series 540H/CT-199 Series 910 Series
Easy-Link
(No Controller Necessary)
Up to 4 units Up to 4 units Up to 4 units Up to 4 units
Maximum input (BTU/h)
796,000 796,000 796,000 1,520,000
Multi-UNIT*
N/A Up to 20 units Up to 20 units Up to 10 units
Maximum input (BTU/h)
N/A 3,980,000 3,980,000 3,800,000
*Requires Multi-Unit Controller: 100112691
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
510/U/C, 540H, CT-199, and 910 models can Easy-Link 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.
MULTI- UNIT SYSTEMS
Unit Comparison
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
COMMON VENTING
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