American Tankless Water Heaters Review

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An expert review of the American tankless water heaters for on demand water heating in residential and small commercial applications. Explore the main advantages and benefits of the condensing and conventional models from this well-known HVAC manufacturer.

American water heaters with the tankless technology are designed for an efficient on-demand heating and continuous supply of hot water in residential and light commercial applications. They are available in several sizes, covering from smaller homes and apartments to large homes with multiple bathrooms, even for heating hot tabs and space heating. Due to its wall-mount and compact design, the tankless heaters occupy much less space than conventional, resulting in additional storage.

American tankless water heaters are built with the full modulation; for the point-of-use and whole-house water heating, with the superb features and materials as found in the top selling and popular brands, such as Rinnai, Noritz or Navien.

Model review

american tankless water heater

The American manufacturer offers a decent number of tankless models for potable water heating; six non-condensing models, and three Energy Star compliant condensing models. All models are designed to use natural or propane gas:

American non-condensing models

GT-110

American tankless water heaters from GT-110 series are the smallest conventional tankless models designed for residential water heating in the apartments, cabins and homes with up to two bathrooms. The modulating gas valve allows them to work in the range between 19,500 and 140,000 Btu and provide a maximum of 6.6 gallons of hot water per minute. One fo the great benefits is the installation flexibility - 110 series can be installed indoor, outdoor and as a direct vent.

GT-310

The 310 series comes with the gas input ranging from 11,000 to 190,000 Btu and greater capacity than the previous model, 8.0 GPM, and this is what makes them great for homes with up to three showers. As the previous models these are available for residential indoor and outdoor installation including direct venting.

GT-510

Water heaters from 510 series are the strongest models in this non-condensing group and they utilize more robust heat exchanger made of the strong HRS35 copper alloy. This is what allows American tankless water heaters from 510 series heavier usage and not only in residential but commercial applications too.

The water heaters are designed for use in potable water and space heating and also for recirculation systems due to its ability to use circulation pumps.

As opposed to two previous series, tankless water heaters from 510 series can be combined through the Easy-Link or Multi-Link systems to provide more power and higher water flow.

All models are able to provide maximum water flow of 10 GPM which makes them great for homes with up to four applications, while being able to change its power from 15,000 to the maximum of 199,000 Btu/h - thanks to the modulating gas valve. 

And this is not the end of awesome features this group offers, because water heaters from 110U, 310U and 510U series are able to meet ultra-low NOx requirements and therefore contribute in environment protection.

American condensing models

American tankless water heaters with the condensing technology are ultra-high efficient units that are equipped with the secondary heat exchanger so it can utilize the latent heat from the flue gases. All the indoor models come with the temperature controller as the standard feature, while the outdoor units include a wall mount controller type. This technology allows them to increase the energy efficiency, which can go as high as 95%, vs. 82% for non-condensing models. All the condensing models come with the ultra-low NOx gas combustion.

GT-240H

GT-240H models are, with the maximum water flow of 6.6 GPM, the smallest condensing units available, designed for installation in smaller homes, apartments, condos and cottages. The gas input is in the range from 13,000 to 160,000 Btu and thanks to the high efficient gas combustion, the energy factor is 0.95.

GT-340H

GT-340H, as the above series, is available for the indoor and outdoor installation, also direct venting, and can modulate its power from 13,000 to 180,000 Btu, while providing maximum water flow of 8.0 GPM, enough for supplying hot water to 3 fixtures simultaneously.

GT-540H

Indoor and outdoor water heaters from GT-540H series are designed for larger homes with more than three showers or bathrooms, as they heat water with the maximum power of 199,000 Btu and provide water flow of 10 gallons per minute. These tankless units are recommended not only for residential but commercial applications due to its commercially grade heat exchanger, robust design and great resistance to mechanical and thermal stress. As the above 510 series, 540H series can also use the Easy-Link and Multi-Link system and connect up to 20 units. Only this group is capable to increase the temperature up to 185 F while other models up to 140 F.

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Product Features

Efficiency

All tankless water heaters from American, either non-condensing or condensing are high efficient since the thermal efficiency goes from 84% to high 95%, but only condensing water heaters are Energy Star compliant.

Heat exchanger

Heat exchangers are built strong for better performance and long life. For example, condensing water heaters have one primary HE made of the commercial-grade copper HRS35 and the secondary, which is made of the high quality 316L stainless steel. Great quality and characteristics of the above materials make the heat exchangers resistant to corrosion and high thermal stress.

Water flow

Models are built in variety sizes, so they can provide enough hot water from smaller homes, such as apartments, condos or cottages to larger houses with several bathrooms. This is possible since the water flow goes from low 6.6 to high 10 gallons per minute and with the help of the connecting cable or connection kit, more units can be combined into one system.

Features such as the Easy Link and Multi-Link, as found in 510 and 540 models, allow you to connect up to 4 or up to 20 units, so you can get even more hot water - great for high demanding applications such as hot tubs.

Versatility

American tankless water heaters can be installed indoor or outdoor, depending on the type you are buying. The indoor models are very safe, since the unit has the sealed combustion, so no interior combustion air is used for gas burning. The venting system makes them very flexible, as they can be installed far away from the exterior walls (up to 100 ft). All models are factory built to use natural gas, while they can be converted to use propane or LG gas.

Temperature controller

The built-in temperature controller found in indoor models is very useful and convenient. The outdoor models come with the wall mount remote. With the precision of +/-2 degrees, it allows you, not only to change and monitor the temperature of the outgoing hot water, but diagnose problems, get the error codes for easier repair and readings such as the energy usage, water flow, etc. The temperature can be set on the remote controller from its minimum of 99 F to the maximum of 140 F or 185 F on some models (510 and 540H series, for example).

Ignition

The water heater uses an electronic ignition to light the gas burner automatically, and as soon as the hot water tap is opened.

Safety features

To provide safe and reliable work, American Company protects its gas-powered tankless water heaters with several safety features:
  • Air-Fuel Ration (AFR) sensor helps maintaining the proper and clean combustion.
  • Overheat protection against high temperature using the Hi-Limit switch.

  • Flame failure protection when the burner flame is extinguished.

  • Power failure when the unit loses power.

  • Overcurrent protection.

  • Fusible link when overheat protection fails to protect the water heater.

  • Internal freeze protection that includes electrical heating elements that keeps the water temperature inside the heat exchanger above the level that prevents freezing.
All the functions from above are controlled by an onboard circuit board.

Warranty

American tankless water heaters for residential use come with the warranty of 15 years on heat exchanger and five on all other parts, while in commercial application the warranty is 10 years.


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