A.O. Smith ATI-705N, ATO-705AN, ATI-505N, ATO-705N, ATO-305N User Manual

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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

Model Natural / Propane Hot Water Output (GPM) Shipping Number Minimum Maximum Maximum 45º F Rise 77º F Rise Weight (lbs)

INDOOR MODELS

ATI-305N 15,000 199,000/190,000 5.3 5.3 4.2 50

ATI-505N 15,000 199,000/190,000 8.5 7.4/7.1 4.2 50

ATI-705N 19,000 237,000 9.8 8.8 5.1 55

ATI-705AN* 19,000 237,000 9.8 8.8 5.1 55

OUTDOOR MODELS

ATO-305N 15,000 199,000 5.3 5.3 4.2 50

ATO-505N 15,000 199,000 8.5 7.3 4.2 50

ATO-705N 19,000 237,000 9.8 8.7 5.1 55

ATO-705AN* 19,000 237,000 9.8 8.7 5.1 55

* 705A models are ASME Certified. For propane, change “N” to “P” in model number (ATI-305P).

BTU Input Approximate

500 Tennessee Waltz Parkway •Ashland City, TN 37015

www.hotwater.com

January 2008R

A. O. Smith On-Demand Gas Water Heaters

Endless Hot Water. Endless Innovation.

Trust the innovation leader to give

Remote Controller

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

Temperature Display

Shows the temp setting

Error Codes

When a fault is detected an error code

flashes at the temperature setting

Thermostat

Increases/decreases temp setting

In Use Indicator Light

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

Priority Indicator

Indicates that this controller is setting the temperature

Priority Button

Priority can be changed to another controller if desired

On/Off Button

Will turn the water heater on/off

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.

Product Features:

Innovative Technology

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Indoor and outdoor installation options

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Continuous hot water on demand (up to 9.8 GPM)

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Whole house water heating solution

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Direct electronic ignition – no pilot light

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On-board diagnostics and safety monitoring

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Interior sealed combustion (does not use interior combustion air)

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Applicable for residential hydronic heating applications

Excellent Performance

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

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Can be installed outdoors, saving valuable indoor square footage

Energy Efficiency

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

Sleek Design

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Smooth pleasant lines and rounded corners

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Matching pipe cover available for finished appearance

Commercial

Application Features:

• 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

Model Selection Guide

Ground water temperature factor.

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.

Peak hot water demand.

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 Temperatures

SOUTHERN ZONE

Average Ground Water

Temperature: 62°F to 77°F

Appliances or fixtures

in simultaneous use

during peak demand

1 305 or 505 305 or 505 305 or 505

2 305 or 505 305 or 505 305 or 505

3 505 or 705 (2) 505 or 705 (2) 505

4 (2) 505 (2) 505 (2) 505

5 (2) 505 (2) 705 (2) 705

6 or more Multi-system Multi-system Multi-system

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

CENTRAL ZONE

Average Ground Water

Temperature: 52°F to 61°F

Ground Water Temperature Zone

Southern Zone Central Zone Northern Zone

NORTHERN ZONE

Average Ground Water

Temperature: 37°F to 51°F