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Home > American Water Heaters > American Tankless Water Heater

American Tankless Water Heater

Review of tankless natural and LP gas models made by an American Water Heater Company

If looking to buy an instant and on demand hot water, American tankless water heater made by an American water heater company, owned by AO Smith Corporation, might be a solution for you.

American tankless gas models features
Specifications
Components
American tankless safety features

American Tankless Water Heater Features

There are six American tankless gas water heaters available from this manufacturer for your residential water heating needs, with different capacities and installation options. All American tankless heaters 305, 505 and 705 models are wall mounted and can be installed inside as direct vented units or outside, with no venting required.

American tankless water heater models come with a 12-year limited warranty on heat exchanger and 5-year warranty on parts.

The main advantages of American tankless heaters over storage tank type water heating units are heater's continuous hot water, technology that works on demand and when it is needed; and plenty of hot water for the whole house. American tankless gas units are designed as small and compact, making them flexible during installation, with an easy mounting on the wall, which is saving you lots of space.

American tankless water heater is energy efficient gas unit with 84% thermal efficiency and high performance level; reducing energy waste and increasing money savings.

Standard equipment like direct electronic ignition (no pilot light and waste of gas) and accurate remote temperature control of +/-2 F are also helping in reducing energy waste.

To prevent scalding water, 120 F or 49 C is a default maximum temperature for models 305 and 505, with an option to increase it to 140 F or 60 C; while tankless model 705 has a factory set maximum hot water temperature of 140 F or 60 C.

Temperature controller is recommended as you can easily set the desired temperature and diagnose the problem when the error code appears (great tool for troubleshooting).

All tankless water heater models are using natural gas, which is factory set, with an easy conversion to propane gas.

On demand American water heater interior models, are combustion sealed; where outside air is drawn inside the chamber while inside air is protected of being used. Flue gases as products of combustion are forced out at the same time through the venting kit.

American Tankless Specifications

American tankless gas models GT-305 are designed to work with min 15,000 BTU/h and max. 180,000 BTU/h gas input, providing maximum of 7.5 GPM of hot water. With energy factor, EF of 0.82, 305 models are Energy Star qualified.

Models GT-505 are designed to work within the range of min 15,000 BTU/h and max. 199,000/190,000 (propane) BTU/h gas input, providing maximum of 9.4 GPM of hot water. With energy factor, EF of 0.82, 505 models are Energy Star qualified.

American tankless models GT-705 are designed to work with min 19,000 BTU/h and max. 237,000 BTU/h of gas, providing maximum of 9.8 GPM of hot water. 705 models are not Energy Star considered as the rule applies only on units up to 199,000 BTU/h.

Components

Heat exchanger

Heat exchanger thermistor or over-heat switch

Gas burner

Spark electrode and flame rod (it proves ignition)

Flue outlet

Combustion fan - when it is energized, it purges the combustion chamber.

Solenoid valves

Thermal fuse

PC board - monitors inlet and outlet water temperature inside the tankless water heater, flow rate, flame rod, fan motor frequency...

Frost sensing switch

Modulating gas control valve - modulates gas input to required value.

Water flow device and sensor - send pulses to PCB when minimum water flow is established.

Water inlet and outlet

Features

Overheating system shuts the tankless water heater automatically if there is an excessive temperature rise, much higher that pre-set temperature.

If the above overheating system fails, a fusible link will break, shutting off the unit.

Flame failure system is used to shut the system off if the burner flame is not present.

If there is a situation with power failure, the water heater will cut off the gas automatically.

In a case of over-current, the power surge glass fuse will blow and shut the tankless water heater off.

Freeze protection that includes electrical heating elements and intermittent firing of the burner.

Note: Keep in mind that a minimum flow rate of 0.6 GPM and min. pressure of 20 PSI has to be provided for normal performance, for any American tankless water heater model.

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