Water Heater Brochure

Model Number* Type
Gas Consumption Input** Inlet Gas Pressure**
UEF
Minimum (BTU/H) Maximum (BTU/H) Minimum (in. W.C.) Maximum (in. W.C.)
ATI-510U Natural 15,000 199,000 4.0 10.5 0.82
ATO-510U Natural 15,000 199,000 4.0 10.5 0.81
ATI-310U Natural 15,000 199,000 4.0 10.5 0.82
ATO-310U Natural 15,000 199,000 4.0 10.5 0.82
ATI-110U Natural 15,000 140,000 4.0 10.5 0.81
ATO-110U Natural 15,000 140,000 4.0 10.5 0.81
Model Number* Maximum GPM Hot/Cold Connections Gas Connection
Approx Shipping
Weight (lbs)
ATI-510U 10 3/4" NPT 3/4” NPT 40
ATO-510U 10 3/4" NPT 3/4” NPT 40
ATI-310U 8 3/4" NPT 3/4” NPT 39
ATO-310U 8 3/4" NPT 3/4” NPT 39
ATI-110U 6.6 3/4" NPT 3/4” NPT 39
ATO-110U 6.6 3/4" NPT 3/4” NPT 39
Specifications
ANSI Z21.10.3 • CSA 4.3
Gas convertible from natural gas to propane using the included
conversion kit
4” category III vent up to 60 equivalent feet
EASY-LINK
TM
up to four 510U heaters or up to twenty 510U heaters
with multi-unit controller
Warranty
• 15-year limited warranty on heat exchanger in residential
applications
• 5-year limited warranty on heat exchanger in commercial
applications
• 5-year warranty on all parts
• Refer to hotwater.com for further warranty details
Features
Temperature Settings
120°F (Default Setting)
110U/310U: 100-140°F (5°F Increments)
510U: 100-160°F (5°F Increments)
Electric 120 V 60 Hz 1.02 Amps
510U only
*Units are field convertible from natural gas to propane with supplied conversion kit.
**For propane, minimum inlet gas pressure is 8.0 in. W.C. and maximum inlet gas pressure is 14.0 in. W.C.
RESIDENTIAL NON-CONDENSING ULTRA-LOW NOX
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