A. O. Smith On-Demand
Gas Water Heaters
Each A. O. Smith on-demand water heater is designed for a
specific application. Consult your sales representative or contact
A. O. Smith for specifications and recommendations on which
model is right for specific requirements.
INNOVATION ON DEMAND
A. O. Smith’s complete line of tankless gas water heaters
Model Specifications
BTU Input
Approximate
Shipping
Weight (lbs)
Model
Number
Natural / Propane
Hot Water Output (GPM)
45º F Rise
Minimum
Maximum
Maximum
77º F Rise
INDOOR MODELS
ATI-305N
15,000
15,000
19,000
19,000
199,000/190,000
199,000/190,000
237,000
5.3
8.5
9.8
9.8
5.3
7.4/7.1
8.8
4.2
4.2
5.1
5.1
50
50
55
55
ATI-505N
ATI-705N
ATI-705AN*
237,000
8.8
OUTDOOR MODELS
ATO-305N
ATO-505N
ATO-705N
ATO-705AN*
15,000
15,000
19,000
19,000
199,000
199,000
237,000
237,000
5.3
8.5
9.8
9.8
5.3
7.3
8.7
8.7
4.2
4.2
5.1
5.1
50
50
55
55
* 705A models are ASME Certified.
For propane, change “N” to “P” in model number (ATI-305P).
500 Tennessee Waltz Parkway
Ashland City, TN 37015
•
AMGBROO107 ©2007 A. O. Smith Corporation
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A. O. Smith reserves the right to make product changes or improvements at any time without notice.
Printed in U.S.A
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In Use Indicator Light
Indicates hot water is being supplied
(a tap is open)
Remote
Temperature Display
Priority Indicator
Indicates that this controller is
setting the temperature
A. O. Smith On-Demand
Gas Water Heaters
Shows the temp setting
Controller
All models come with a
Remote controller that
can set the temperature
within a specific range.
Error Codes
When a fault is detected an error code
flashes at the temperature setting
Priority Button
Priority can be changed to another
controller if desired
Endless Hot Water. Endless Innovation.
Trust the innovation leader to give
you more choices in on-demand water
heating. A. O. Smith’s comprehensive
line supplies endless hot water when
you ask for it...with high efficiency that
saves money on both residential and
commercial applications.
Thermostat
On/Off Button
Increases/decreases temp setting
Will turn the water heater on/off
Model Selection Guide
Ground water
temperature factor.
Average Ground Water Temperatures
The temperature of incoming
ground water (cold water inlet
temperature)
throughout the U.S. and also
fluctuates with change of season.
The temperature of water as it
enters the water heater will
varies
greatly
determine
the
amount
of
“temperature rise” required to
achieve the desired hot water
outlet temperature (120°F is
recommended).
Product Features:
The best way to measure your
incoming ground water temperature
is to use a thermometer to measure
cold water temperature during the
coldest season of the year. To
simplify the process, use this map to
determine whether your installation
location is in the Southern Zone,
Central Zone or Northern Zone.
Innovative Technology
Energy Efficiency
Commercial
SOUTHERN ZONE
CENTRAL ZONE
NORTHERN ZONE
■
■
Indoor and outdoor installation options
Up to 84% thermal efficiency,
Application Features:
Average Ground Water
Average Ground Water
Average Ground Water
providing significant energy
cost savings
■
Continuous hot water on demand
Temperature: 62°F to 77°F
Temperature: 52°F to 61°F
Temperature: 37°F to 51°F
(up to 9.8 GPM)
• ASME Certified
■
Whole house water heating solution
• Hot water capacity of 0.6 – 9.8 GPM
Sleek Design
■
Direct electronic ignition –
• Min. – Max. input: 19,000 – 237,000 BTU
■
Smooth pleasant lines and
no pilot light
Peak hot water demand.
rounded corners
Ground Water Temperature Zone
Appliances or fixtures
in simultaneous use
during peak demand
• Max. temperature: 185°F with
Commercial Controller
■
On-board diagnostics and
The next step is to determine how
much hot water will be required
during the busiest usage period
(“peak demand”). To use the chart,
consider all appliances and fixtures
that use hot water including
lavatory faucets, kitchen faucets,
washing machines, dishwashers,
showers and bathtubs. Be sure to
determine how many appliances
and fixtures will be used at the
same time (“peak demand”).
■
Matching pipe cover available
Southern Zone
Central Zone
305 or 505
305 or 505
(2) 505 or 705
(2) 505
Northern Zone
305 or 505
305 or 505
(2) 505
safety monitoring
for finished appearance
• Ideal for small restaurants, multifamily
housing, hair salons and spas,
laundromats, car washes and other
limited commercial needs
1
305 or 505
305 or 505
505 or 705
(2) 505
■
Interior sealed combustion
(does not use interior combustion air)
2
■
Applicable for residential hydronic
3
heating applications
4
5
(2) 505
(2) 505
(2) 705
(2) 705
Excellent Performance
6 or more
Multi-system
Multi-system
Multi-system
■
12-year limited warranty on
heat exchanger, 5-year warranty
on all parts
*Note: This selection guide is based on 120°F outlet water temperature.
■
Can be installed outdoors, saving
valuable indoor square footage
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