Ruud Tankless Water Heaters
Review and Buying Tips

Review of the Ruud tankless water heaters with the condensing and non-condensing technology. Explore the features, benefits, and differences.

Ruud tankless

Ruud tankless water heaters are designed with condensing and conventional technology and can be installed indoor or outdoor. All models provide hot water on demand and do not utilize the storage water tank as the conventional models. Indoor models are specially made for indoor installations and cannot be used outside, and the outdoor models cannot be used inside. The outdoor models are most of the time installed on the outside wall or in the recess box, which is an accessory that can be bought from Ruud.

The common features found on all Ruud tankless models is the Energy Star compliance, the Exclusive Guardian overheat film wrap that protects the heat exchanger from the extreme temperature and freeze protection which allows the use of heaters during cold weather with the temperatures up to -30 F.

Condensing models

Ruud condensing water heaters are designed to use the latent energy from the flue gases to increase the temperature of the incoming water, which results in high overall efficiency of 94%. There are two sizes, and four models total that can be used in residential and with the right installation kit, commercial applications.

All the tankless and condensing water heaters are using the advanced features which include the intelligent electronic control and self-diagnostic system, for convenient temperature monitoring and troubleshooting. With every unit, the remote control is provided so you can conveniently monitor the real-time temperature of the outgoing hot water and the error codes if the problem exists.

Condensing water heaters such as those shown below are utilizing two heat exchangers; one stainless steel and the other one made of copper.

Ruud Tankless RUTGH-95

Ruud tankless RUTGH-95 is the largest condensing water heater that is available for the indoor and outdoor installations. The indoor model, RUTGH-95DVLN is the direct vent model also that utilizes the two-pipe vent system with the standard and low-cost PVC, while the venting pipes are not needed on the outdoor models RUTGH-95XLN, as they are ventless.

The maximum water flow of 9.5 gallons per minute (at 35 F temp. rise) supplies enough hot water for 3 bathrooms working at the same time. The modulating gas valve and the burner will make the water heater work in the range from 11,000 to 199,000 BTU and temperature range between 85 F and 140 F (or 185 F for commercial models).

The modulation and the hot start programming are what makes the Ruud tankless water heaters work with the constant temperature output and reduced "hot water sandwiching" for the increased comfort. For homes and families with the high demand of hot water, Ruud provides the EZ-link cable that connects two identical models to work as one and with the special manifold control board it can manifold up to 20 units.

Ruud Tankless RUTGH-85

The RUTGH-85 is the smaller model than the above unit, and it operates between the 11,000 and 157,000 BTU, but it can still provide the same maximum temperature of 140 F and high energy efficiency of 94%. The water flow is lower; its maximum is 8.4 gallons per minute, which is recommended for homes with two to three baths... or more if EZ-link is used.

Non-condensing models

There are Ruud tankless water heaters with the same capacity, gas input and most of the features as the above RUTGH-85 and RUTGH-95, but are designed without the condensing technology and have only one heat exchanger.

For smaller homes with up to two bathrooms, Ruud offers two models, RUTG-65 for an indoor and outdoor installation. All three non-condensing water heaters come with the lower energy efficiency of 82%, are using the ultra-low NOx burners and are still Energy Star compliant.

Another difference from the above condensing models is that RUTG 64, 85 and 94 are using the coaxial venting system (pipe inside the pipe), which is made of stainless steel.

Ruud designs the tankless heaters so they can provide enough hot water for homes with one bath to multiple-bath homes, even homes with the hot tubs, jacuzzi, and oversized luxury bathrooms. Due to the lower activation rate, Ruud tankless can be easily used in homes with the low-flow faucets.


The tankless technology is ideal for whole-house applications in residential and commercial applications, for small and large new and retrofitted homes, also cottages, apartments, and offices with one fixture. Every Ruud tankless water heater is wall-hanging, which saves on the floor space and its flexible installation allows mounting almost anywhere.

Ruud tankless water heaters, with its tank-less and condensing technology, provide significant energy savings, enhanced comfort level, and convenience, reliable operation and long lasting life. The warranty is industry standard - 12 years on the heat exchanger and 5 on other components.


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