A. O. Smith On-Demand Gas Water Heaters
Residential and Commercial Product Features:
■A variety of indoor 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)
| Excellent Performance | Outlet Flow Data |
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exchanger, |
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■Models available that meet requirements
of ASME Boiler and Pressure Vessel Code
Energy Efficiency■Up to 84% thermal efficiency, providing significant energy cost savings
Model Specifications
Model |
| 305 |
| 505 |
| 705 | |
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Minimum Gas Consumption Btu/h |
| 15,000 |
| 19,000 | |||
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Maximum Gas Consumption Btu/h | 199,000 Natural Gas |
| 237,000 | ||||
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| 190,000 Propane Gas |
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Hot water capacity (Min - Max)* |
| 0.6 - 5.3 GPM |
| 0.6 - 8.5 GPM |
| 0.6 - 9.8 GPM | |
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| (2.3 - 20.1 L/min) |
| (2.3 - 32.0 L/min) |
| (2.3 - 37 L/min) |
Hot water capacity (45°F rise) |
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| 7.4 GPM (28.0 L/min) |
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| 5.3 GPM |
| Natural Gas |
| 8.8 GPM |
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| (20.1 L/min) |
| 7.1 GPM (26.9 L/min) |
| (33.5 L/min) |
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| Propane Gas |
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Default Temperature Setting (no controller) |
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| 120º F (49º C) |
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Remote Controller Default Temperature Setting |
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| 104º F (40º C) |
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Maximum Temp Setting (Commercial**) | 160º F (71º C) |
| 185º F (85º C) |
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Maximum Temp Setting (Residential) |
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| 140º F (60º C) |
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Minimum Temperature Setting |
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| 98º F (37º C) |
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Weight |
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| 50 lb (23 kg) |
| 55 lb (25 kg) | ||
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Efficiency Rating |
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| 84% |
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Noise level |
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| 49 dB |
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Electrical Consumption |
| Normal |
| 79 W |
| 99 W | |
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| Standby |
| 2.8 W |
| 2 W | |
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| 100 W |
| 116 W | ||
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| Fixed |
| Electronic |
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Minimum Gas Supply Pressure |
| Natural Gas | 5.0 inch W.C. |
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| Propane | 8.0 inch W.C. |
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Maximum Gas Supply Pressure |
| Natural Gas | 10.5 inch W.C. |
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| Propane | 13.5 inch W.C. |
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Type of Appliance |
| Direct Vent, Temperature controlled continuous flow gas hot water system. | |||||
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Operation |
| With or without remote controls, mounted in kitchen, bathroom, etc. | |||||
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Approved Gas Type |
| Natural Gas or Propane - Ensure unit matches gas type it's being installed on. | |||||
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Connections |
| Gas Supply: 3/4˝ MNPT, Cold Water Inlet: 3/4˝ MNPT, Hot Water Outlet: 3/4˝ | |||||
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Ignition System |
| Direct Electronic Ignition |
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Electric Connections |
| Appliance: AC 120 Volts, 60Hz. Remote Control: DC 12 Volts (Digital) | |||||
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Water Temperature Control |
| Simulation Feedforward and Feedback. |
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Water Supply Pressure |
| Minimum Water Pressure: 20 PSI (Recommended | |||||
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Maximum Water Supply Pressure |
| 150 PSI |
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Remote Control Cable |
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*Minimum flow may vary slightly depending on the temperature setting and the inlet water temperature. ** for commercial and hydronic applications requiring higher temperatures
Specifications are subject to change without prior notice.
The maximum inlet gas pressure must not exceed the value specified by the manufacturer. The minimum value listed is for the purpose of input adjustment.
500 Tennessee Waltz Parkway • Ashland City, TN 37015 • www.hotwater.com
AMGSS00207 ©2007 A. O. Smith Corporation | A. O. Smith reserves the right to make product changes or improvements at any time without notice. | Printed in U.S.A |
