A.O. Smith ATI-505N Merkblatt

*Note: This selection guide is based on 120°F outlet water temperature.

The temperature of incoming
ground water (cold water inlet
temperature) varies greatly
throughout the U.S. and also
fluctuates with change of season.
The temperature of water as it
enters the water heater will
determine the amount of
“temperature rise” required to
achieve the desired hot water
outlet temperature (120°F is
recommended).

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.

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”).

Average Ground Water 

Temperature: 62°F to 77°F

Average Ground Water 

Temperature: 52°F to 61°F

Average Ground Water 

Temperature: 37°F to 51°F

All models come with a
Remote controller that 
can set the temperature
within a specific range.

Indicates hot water is being supplied 
(a tap is open)

Indicates that this controller is 
setting the temperature

Priority can be changed to another 
controller if desired

Will turn the water heater on/off

Shows the temp setting

When a fault is detected an error code

flashes at the temperature setting

Increases/decreases temp setting

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.

■

Indoor and outdoor installation options

■ 

Continuous hot water on demand 
(up to 9.8 GPM)

■

Whole house water heating solution

■

Direct electronic ignition – 
no pilot light

■

On-board diagnostics and 
safety monitoring

■

Interior sealed combustion 
(does not use interior combustion air)

■

Applicable for residential hydronic
heating applications

■

12-year limited warranty on 
heat exchanger, 5-year warranty 
on all parts

■

Can be installed outdoors, saving 
valuable indoor square footage

■

Up to 84% thermal efficiency,
providing significant energy 
cost savings

■

Smooth pleasant lines and 
rounded corners

■

Matching pipe cover available 
for finished appearance

• ASME Certified 

• Hot water capacity of 0.6 – 9.8 GPM

• Min. – Max. input: 19,000 – 237,000 BTU

• Max. temperature: 185°F with 

Commercial Controller

• Ideal for small restaurants, multifamily 

housing, hair salons and spas,
laundromats, car washes and other 
limited commercial needs 

201866 AMGBR00107   2

201866 AMGBR00107   2

9/10/08   11:39:01 AM

9/10/08   11:39:01 AM