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  2. sku: 8125858412282731
  3. RINNAI RU90E

RINNAI Condensing Tankless Water Heater RU90EN 180 000-BTU

Ru90en Rinnai Ru90e 180 000 Btu Condensing Outdoor Tankless Water Heater

( Brand: Rinnai ), ( Manufacturer Part Number: RU90E ), ( Type: Condensing Tankless Water Heater ), ( Power Source: Propane Gas ), ( Heating System: Instantaneous ), ( Color: Gray ), ( Mounting Location: Outdoor )

Review RINNAI 180 Btu Condensing Outdoor Tankless Water Heater

The Rinnai RU90e and RU90en Condensing Tankless Water Heaters are high-performance, energy-efficient solutions for providing continuous hot water for residential applications. These models share the same impressive features, with the primary difference being their venting options: the RU90e is designed for use with a PVC or CPVC vent system, while the RU90en is compatible with a conventional B-vent system.

Measuring just 14.1 inches by 19.3 inches by 10.2 inches (W x H x D), these compact units can be installed in various locations, including closets, utility rooms, and even outdoors (for the RU90e model with an approved enclosure). With a natural gas input rating of 199,000 BTUs and an efficiency rating of up to 0.95 Energy Factor, these tankless water heaters can deliver a hot water flow rate of up to 9.4 gallons per minute, making them suitable for supplying hot water to larger homes or multi-unit buildings.

The Rinnai RU90e and RU90en models feature a condensing design, which means they capture and reuse the heat that would otherwise be lost in a conventional water heater's exhaust. This results in increased energy efficiency and lower operating costs. Furthermore, they come equipped with a recirculation system, which reduces the wait time for hot water at the faucet and conserves water.

These tankless water heaters are also equipped with advanced technology, such as an electronic ignition system, temperature control, and a digital interface that allows for easy installation and maintenance. The LED display provides real-time information on the water temperature and diagnostic codes, simplifying troubleshooting. Additionally, they come with a built-in safety system that includes a flame rod sensor, temperature sensor, and overheat protection.

The Rinnai RU90e and RU90en Condensing Tankless Water Heaters are designed to last, with a heavy-duty copper heat exchanger and a durable stainless steel condensate heat exchanger. They are covered by Rinnai's comprehensive limited warranty, which includes 12 years on the heat exchanger and 5 years on parts.

In summary, the Rinnai RU90e and RU90en Condensing Tankless Water Heaters are advanced, energy-efficient solutions for providing continuous hot water for residential applications. With their compact design, high flow rate, and advanced features, these units offer numerous benefits, including reduced energy consumption, lower operating costs, and a long lifespan. The choice between the two models depends on the specific venting requirements of your installation.

Rinnia RU90E/RU90EN 180 Condensing Tankless Water Heater: Pros, Cons, and Conclusion

The Rinnia RU90E and RU90EN 180 condensing tankless water heaters are popular choices for those seeking energy efficiency and continuous hot water supply. Let's explore their advantages and disadvantages to help you make an informed decision.

Pros:

1. Energy Efficiency: These water heaters are condensing models, meaning they can extract more heat from the same amount of fuel than traditional tank models. The Energy Factor (EF) rating for these units is 0.95, which is high in comparison to tank water heaters.

2. Endless Hot Water: Tankless water heaters provide hot water on demand, eliminating the need to wait for a storage tank to refill. This is particularly beneficial for households with large families or frequent hot water usage.

3. Space Savings: The absence of a storage tank makes these units more compact, freeing up valuable space in the home.

4. Longer Lifespan: Tankless water heaters generally have a longer lifespan than traditional tank models due to fewer moving parts and less corrosion.

5. Energy Star Certified: Both the RU90E and RU90EN models are Energy Star certified, ensuring energy efficiency and potential cost savings on utility bills.

Cons:

1. Higher Upfront Cost: Tankless water heaters typically have a higher upfront cost than traditional tank models due to their advanced technology and installation requirements.

2. Installation Complexity: The installation process for tankless water heaters can be more complex than that of tank models, involving additional components and venting requirements.

3. Cold Water Sandwich Effect: When multiple hot water appliances are used simultaneously, there might be a slight delay between the delivery of hot water to each appliance, leading to a "cold water sandwich" effect.

4. Potential for Condensation Damage: The condensing technology in these units produces condensation, which can lead to corrosion if not properly managed. Regular maintenance is essential to prevent potential damage.

5. Potential for Mineral Buildup: Hard water areas may experience mineral buildup on the heat exchanger, reducing the efficiency and lifespan of the unit. A water softener or descaling solution may be necessary.

Conclusion:

The Rinnia RU90E and RU90EN 180 condensing tankless water heaters offer several advantages, including energy efficiency, endless hot water, space savings, longer lifespan, and Energy Star certification. However, they also come with some disadvantages, such as a higher upfront cost, installation complexity, potential for cold water sandwich effect, condensation damage, and mineral buildup.

If you're looking for a water heating solution with minimal maintenance, a smaller budget, or a simpler installation process, a traditional tank water heater might be a better choice. However, if energy efficiency, endless hot water, and space savings are your priorities, the Rinnia RU90E or RU90EN 180 condensing tankless water heater could be an excellent investment for your home.

Details:

Comes with all accessories and wired remote control. Original box shows some damage from being moved around, no to the unit. New and unused, older stock. Set up for propane but can be converted with a natural gas kit sold separately.

Free Continental USA ground shipping. Feel free to ask any questions.

part #: ru90e prices

  • $726.00-$749.95

specifications wateheat:

  • brand: Rinnai
  • mpn: Ru90e
  • type: Condensing Tankless Water Heater
  • power source: Propane Gas
  • heating system: Instantaneous
  • color: Gray
  • mounting location: Outdoor

payments wateheat:

  • credit card: Visa
  • other
  • wallet: Google-pay

offer wateheat:

  • sold: 0
  • availability: In Stock
  • started: May 4, 2026
  • options: Ship-to-home
  • quantity: 1

general wateheat:

  • Heating, Cooling Air > Water Heaters > Tankless Water Heaters
  • condition: Open box

returns wateheat:

  • method: Money back
  • policy: Returns Accepted
  • paid by: Seller
  • time: 30 Days

seller wateheat:

  • # reviews: 2890
  • city: Draper, Utah
  • rating: 99.8%

shipping wateheat:

  • cost: $0.00
  • service: UPS Ground
  • class: Standard
  • transit: 3-8 Days
  • carrier: UPS
  • type: Calculated
type: condensing tankless water heater, power source: propane gas, heating system: instantaneous, mounting location: outdoor,
category: home & garden > heating, cooling air > water heaters > tankless water heaters, color: gray, sku: 8125858412282731,

Rinnai RU90E Is Similar To:

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2 offers $726.00–$749.95 USD
  • Offer #1: $749.95 price + $0.00 shipping estimate = $749.95* total. Free Continental USA ground shipping New and unused, older stock.FREE SHIPPING
  • Offer #2: $726.00 price + $0.00 shipping estimate = $726.00* total. The Rinnai RGB-CTWH-2 Condensing Tankless Recess Box is designed for KB Series Ultra tankless water heaters, providing a recessed enclosure for indoor installations.FREE SHIPPING

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