Rinnai Tankless Water Heater
RL75 Review

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There are two Rinnai tankless water heaters from RL75 (old R75LS) series; Rinnai RL75i (old R75LSi) and RL75e (old R75LSe) model; both of them Energy Star approved and design to provide enough hot water for up to four hot water units simultaneously.

The silver metallic and shiny look makes Rinnai RL75 models very attractive, so you can put them anywhere inside your home, and if your kitchen is equipped with the stainless steel appliances, it's a perfect match. I would say, hidden in a closet is not the right place for such contemporary designed Rinnai water heaters.

Rinnai tankless water heater RL75 is sold as the "Luxury model" designed with the 7.5 gallons per minute capacity and 180 000 BTU per hour gas input, ideal for medium to larger homes. The maximum power is 180,000 Btus but thanks to the modulating gas burner, Rinnai can lower its power to 10,300 Btu for smaller jobs.

Features Review

Rinnai is green

When comparing to the standard water heating units, Rinnai RL75 on-demand water heaters are much more advanced in protecting environment as they produce less greenhouse gases like NOx and CO2, take less space and have more exchangeable parts.

Quality components

Heat exchanger on Rinnai RL75 models is commercial grade unit, made of copper, resistant on corrosion and reliable on high temperatures. Warranty on heat exchanger is 12 years (residential use), while on other replacement parts is 5 years and one on labor. Based on many user reviews and plumbers feedback, these units are truly durable; their life expectancy is 20 years and over.

Rinnai water heater is using the electronic ignition to fire gas, not an energy consuming pilot light that is burning even when there is no need for hot water heating.

Easy installation

Installation of the digital controller is highly recommended so you can set hot water temperature as you wish and within a specific range and with an error code indicator you can diagnose and troubleshoot any problem. These digital controllers are standard equipment on all indoor Rinnai tankless water heaters, but are provided with the outdoor models.

For large homes, offices or restaurants, two Rinnai tankless hot water heaters can be connected by EZConnect cable, so they can work as one unit, providing much more thermal power and hot water.

Rinnai is high efficient

Both models are Energy Star qualified with the energy factor 0.82 for both propane and natural gas use. Tax credit up to $300 and other local rebates are available.

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Safety features

  • Boiling protection

  • Combustion fan RPM check

  • Flame rod in a case of flame failure

  • Remaining flame

  • Thermal fuse

  • Over current - glass fuse

  • Automatic freeze protection (warranty does not cover water heater and parts damage, due to freezing).

  • An auto drain down solenoid valves for freeze protection can be used as back-up when normal freeze protection is disabled. This is not standard equipment, and has to be purchased separately.

  • Min and max pressure system protects unit from lack of water and high pressure in plumbing.

The main competitors in tankless water heating industry, in US and Canada are Noritz, Bosch, Paloma, Navien, Takagi and Rheem.


Rinnai RL75i LSe or RL75e

Rinnai RL75e Tankless Water Heater

Rinnai tankless water heater RL75Le has a great advantage being an outdoor unit so you don't have to worry about possible gas leak, venting system installation, flue gases, water leaking, or finding the right spot for its installation.

Even hanging outside they are still able to provide sufficient hot, potable and clean water, with a consistent and safe temperature, several-bathroom home or any other application in residential and commercial use.

Rinnai RL75i Tankless Water Heater

Rinnai tankless water heater for the inside installation, RL75i, needs an appropriate venting.

Rinnai RL75i can be installed virtually anywhere for domestic water heating as it is designed as combustion sealed water heater.

Flexible unit installation with concentric venting system is such an easy solution. This Rinnai model is using direct vent system where one concentric pipe is used for air intake and for venting gases out.

Rinnai vent kit has to be original, without any modifications on the pipe, like reducing the pipe diameter, and to vent directly outside through the wall, without any connections to the existing vent or chimney.

To prevent condensate draining back into the water heater through venting system, an integrated condensate collector is used to protect the unit with the proper installation (angle) of the flue pipe.

Either way you go, interior, direct vent or exterior installation, Rinnai tankless water heater, from series RL75, is designed not to lose any performance, to be safe for your family and to be used even for hot water heating application up to 10 000 ft or over 3000 m above the sea level.



(Photo credit to Rinnai)

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