Ruud Tankless Water Heaters Review

Reviews  | Submit a Review

A review of the Ruud tankless water heaters for indoor and outdoor use in residential and light commercial applications. Get efficient and reliable on-demand heating and continuous hot water with the condensing and eco-friendly models. Ruud tankless are designed for homes with the low and high demand.

Features and benefits

Condensing technology

Rheem / Ruud manufactures six gas-powered models grouped in the Professional Ultra series that utilize tankless technology for on-demand and continuous hot water supply. The key feature is the sophisticated condensing technology that utilize the secondary condensing heat exchanger made of stainless steel, which is taking advantage of the latent heat energy found in exhaust gases. This is what boosts the efficiency to the maximum of 94% (min. is 92%), making them Energy Star compliant for great energy savings.

The secondary heat exchanger is made of stainless steel, but the primary is constructed of the copper, still resistant to high temperatures and corrosion.

Due to the acidic nature of the condensate, a built-in condensate neutralizer is used, which also helps in reducing the installation cost and time.

Flexible venting

All Ruud tankless water heaters are grouped in two categories - depending on the location where they can be installed: indoor models, that use the 2-pipe direct vent (DV) system for moving the exhaust gases out and directing the outdoor air in, and outdoor or ventless, that can be installed outdoor only. The direct vent setup allows either horizontal or vertical termination.

The indoor model, due to the lower temperature of exhaust gases and DV setup, utilize the PVC vent pipes, which come with the lower cost than the vents on the non-condensing models. PVC pipes are also easier to install and maintain.

Sufficient water flow rate

All Ruud tankless water heaters, even the smallest one, are design for the whole-house water heating, since the water flow rate is high - it is in the range from 8.4 to 9.5 GPH which is sufficient for homes with 2-3 bathrooms.

Modulating power

All the units come with the digitally controlled thermostat and due to the modulating gas valve, the temperature of the hot water is easy and precisely to control while saving the energy due to the smart power adjustments - power is used just enough to provide required temperature.

Models review

Here is the list of the available models for year 2016:

  • Professional Ultra Series: 95 DV Indoor - RUTGH-95DVL
  • Professional Ultra Series: 95 Outdoor - RUTGH-95XLN
  • Professional Ultra Series: 90 DV Indoor - RUTGH-90DVL
  • Professional Ultra Series: 90 Outdoor - RUTGH-90XLN
  • Professional Ultra Series: 84 DV Indoor - RUTGH-84DVL
  • Professional Ultra Series: 84 Outdoor - RUTGH-84XLN

Specifications - Technical Data

Min/ Max
# of
Remote /
0.92 0.4
2-3 Yes
0.93 0.4
2-3 Yes
0.94 0.4
3 Yes

emergency plumber

Summary of key features

  • Energy efficient design which leads to energy savings.

  • Advanced electronics that leads to precise and convenient temperature control and problem diagnostics which can be seen as the error codes on the digital display.

  • Capability to operate as a single unit for homes with the smaller hot water demand - up to 9.5 GPM and 3-bath homes, or for large applications (hot tubs, jetted tubs or luxury baths, for example) when used EZ-Link Cable - connects two or more units into one system.

  • Exclusive manifold capabilities that allow installation up to 20 tankless units into one system, by using one modulating controller and one remote control.
  • Long warranty of 12 years and over 20 years expected service.

  • Exclusive Guardian overheat film wrap that protects from overheating.

  • Convenient automatic ignition for easy lighting.

  • Hot start programming allows Ruud to work with the reduced temperature fluctuation, also known as "cold water sandwiches", providing better comfort.

  • Ultra Low NOx gas combustion making the water heaters environment friendly.

  • Safety: freeze protection up to -30 F.

  • Temperature adjustments up to the maximum of 185 F in commercial applications.

  • High-altitude compliance up to and above 9,000 feet.


As it can be seen from the above review, Ruud tankless water heaters are not available in many models as the manufacturers specialized for on-demand heaters such as Rinnai or Noritz, but they still have powerful models that are condensing, ultra high efficient and also environment friendly with its ultra-low NOx gas combustion. The warranty is great, and the parent company, Rheem, as the recognized name in water heating industry, ensures the quality and good service.

(Photo courtesy of Ruud / Rheem)