Product Overview

• Ultra-Low NOx condensing technology provides significant
energy cost savings
• ENERGY STAR
®
qualified
• Indoor models have integrated controls & diagnostics
• Outdoor models include remote control as standard feature
• 15-year limited residential heat exchanger warranty
• 5-Year limited commercial heat exchanger warranty
• 5-Year limited parts warranty
HIGH EFFICIENCY
CONDENSING
• Complies with Ultra-Low NOx regulations
• Gas convertible from natural gas to propane using supplied kit
• Vents with contractor preferred concentric venting
• Models have integrated controls and diagnostics
• 15-year limited residential heat exchanger warranty
• 5-year limited commercial heat exchanger warranty
• 5-year limited parts warranty
*Indoor models only. Units are field convertible from natural gas to propane
with supplied conversion kit.
NON-CONDENSING
CONCENTRIC VENT
*For Propane, change the N to P in the model number when ordering:
Example: ATI-240H-P
+Propane (LP) Gas Btu/H is 13,000. Except ATI/O-140 models.
Model
Number*
Type
BTU/h Input Natural
UEF
Minimum Maximum
ATI-110C-N Indoor 15,000 140,000 0.81
ATI-310C-N Indoor 15,000 190,000 0.81
ATI-510C-N Indoor 15,000 199,000 0.81
Model
Number*
Type
BTU/h Input Natural
UEF
Minimum+ Maximum
ATI-140H-N Indoor 15,000 120,000 0.90
ATI-240H-N Indoor 15,000 160,000 0.94
ATI-340H-N Indoor 15,000 180,000 0.95
ATI-540H-N Indoor 15,000 199,000 0.93
ATI-540P-N Indoor 15,000 199,000 0.93
ATO-140H-N Outdoor 15,000 120,000 0.91
ATO-240H-N Outdoor 15,000 160,000 0.95
ATO-340H-N Outdoor 15,000 180,000 0.94
ATO-540H-N Outdoor 15,000 199,000 0.95
ATO-540P-N Outdoor 15,000 199,000 0.95
Model
Number*
Hot Water Output (GPM)
Unit
Weight
(lbs.)
Maximum 45°F Rise 70°F Rise
ATI-110C-N 6.6 5.1 3.3 51
ATI-310C-N 8.0 6.9 4.4 51
ATI-510C-N 10.0 7.2 4.7 51
Model
Number*
Hot Water Output (GPM)
Unit
Weight
(lbs.)
Maximum 45°F Rise 70°F Rise
ATI-140H-N 6.6 5.0 3.2 44
ATI-240H-N 6.6 6.6 4.3 58
ATI-340H-N 8.0 7.6 4.9 58
ATI-540H-N 10.0 8.4 5.4 59
ATI-540P-N 10.0 8.4 5.4 59
ATO-140H-N 6.6 5.0 3.2 44
ATO-240H-N 6.6 6.6 4.3 58
ATO-340H-N 8.0 7.6 4.9 58
ATO-540H-N 10.0 8.4 5.4 59
ATO-540P-N 10.0 8.4 5.4 59
• X3 scale prevention technology (patent pending)
• ENERGY STAR
®
qualified
• Dual stainless steel heat exchangers
• Integrated recirculation pump (title 24 compliant)
• Operates with 1/2-inch gas line and includes 1/2-inch
gas connection
• “Peace of mind” limited warranty with no hard water
exclusions
• 15-year limited residential heat exchanger warranty
• 1-year limited commercial heat exchanger warranty
• 5-year limited parts warranty
*Field gas convertible from natural gas to propane. Conversion kit is included
with the heater.
+Units are also indoor/outdoor with accessory vent kit.
15-150 PSI water pressure. 40 PSI or above recommended for maxium flow.
CONDENSING
WITH X3
TM
SCALE
PREVENTION
TECHNOLOGY
Model
Number*+
Type
BTU/h Input Natural
UEF
Minimum Maximum
AT-160X3P Indoor 9,000 160,000 0.93
AT-180X3P Indoor 9,000 180,000 0.93
AT-199X3P Indoor 9,000 199,000 0.93
Model
Number*+
Hot Water Output (GPM)
Unit
Weight
(lbs.)
Maximum 45°F Rise 70°F Rise
AT-160X3P 6.6 160 - 6.6 160 - 4.3 80
AT-180X3P 8.0 180 - 7.6 180 - 4.9 80
AT-199X3P 10 199 - 8.4 199 - 5.4 80