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Internet # 322407659

Model # RE180iN

Store SKU # 1008470818

High Efficiency Non-Condensing 8.5 GPM Residential 180,000 BTU Interior Natural Gas Tankless Water Heater

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  • Unlimited Hot Water
  • Less space for heating gives you more space for living
  • Save energy and costs by operating only when hot water is needed
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Product Details

About This Product

RE180iN is the perfect combination of high efficiency, comfort and value in a natural gas non-condensing tankless water heater from Rinnai. Ideal for small to medium homes or remodels. Only the size of a small suitcase, is easy-to-install, reliable, and perfect for indoor locations. Rinnai products provide peace of mind with warranties that surpass the competition.


  • Professional installation recommended; please call 833-746-6210
  • Uniform energy factor of 0.82
  • Improve your lifestyle by never running out of hot water
  • Save time with hot water whenever and wherever you need it, any size home, even for simultaneous uses at multiple fixtures
  • Save energy and reduce utility costs by operating only when hot water is needed
  • Maximum output, minimum space, suitable for installation in non-traditional spaces such as crawl spaces and attics
  • Optimized concentric vertical or horizontal PVP/CPVC venting system termination configurations available -featuring inner pipe for exhaust and outer pipe for fresh outdoor air; resulting in a direct-vent system with one penetration through the wall or roof.
  • Wi-Fi Ready; requires control-r module
  • Residential warranty: limited 15-year on heat exchanger, 5-year on parts, 1-year on labor (register within 90-days and receive an additional 4-years of labor coverage free a $250 value)
  • Commercial warranty: limited 8-year or 12,000-hours, on heat exchanger, 5-year on parts, 1-year on labor (register within 90-days and receive an additional 1-year of labor coverage)
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 322407659

Model # RE180iN

Store SKU # 1008470818


Dimensions: H 27.28 in, W 14.05 in, D 10.77 in


Product Depth (in.)

10.77 in

Product Height (in.)

27.28 in

Product Width (in.)

14.05 in

Vent diameter (in.)

0.6 in

Water Connection Size (in.)



Application Type


BTU Rating


Efficiency Level


Finish Family

Silver Metallic

First Hour of Delivery (gallons/hr)


Flow Rate @ 35°F Rise (gallons/min)

8.5 gal (US)/min

Flow Rate @ 45° Rise (gallons/min)

6.6 gal (US)/min

Flow Rate @ 55° Rise (gallons/min)

5.4 gal (US)/min

Flow Rate @ 65° Rise (gallons/min)

4.6 gal (US)/min

Fuel Type


Gas Connection Size

3/4 in

Gas Type

Natural Gas

Heat Exchanger Warranty

15 Year



Maximum Temperature (F)

140 F

Minimum Activation Rate (gpm)


Minimum Temperature (F)

98 F

Number of Showers


Pack Size


Product Weight (lb.)

42.1 lb

Required Volt Connection

120 volt



Total BTU (Btu)

180000 Btu

Uniform Energy Factor


Vent Type


Water Heater Features

Digital Display, Freeze Protection, Overheat Protection, Ultra LoNox, Wall Mounted, WiFi

Warranty / Certifications

Certifications and Listings

AHRI Certified, CSA Certified, Energy Star

Labor Warranty

1 Year

Part Warranty

5 Year

Questions & Answers

Q:I can’t adjust the temperature. How do I do it?
by|Mar 7, 2024
1 Answer
Answer This Question

A:  Hi Matt, the information can be found in the owners manual under parameter settings. You will need to adjust the 01 parameter setting from A to B. This will allow you to raise the temperature up to 140.

by|Mar 7, 2024
    Q:Can I use my existing 3" vent from my old 40 gal. tank type. I want to put in the tankless gas RN140iN. Vent runs straight up through ceiling and attic, or should I make a 10' horizontal run to side of garage with 5" pvc?
    by|Mar 7, 2024
    1 Answer
    Answer This Question

    A:  Hi Vent, for this unit you would not be able to use your existing vent. The exhaust on our Non Condensing units burn to hot for PVC and also require concentric venting which allow the unit to emit exhaust and pull in fresh air from a single vent piece.

    by|Mar 7, 2024
      Q:can this unit be mounted in an exterior room with vented metal door? elevation 1800 ft does get in the upper 20*f rarely in the peak winter time
      by|Feb 14, 2024
      1 Answer
      Answer This Question

      A:  Hi pipesize, as long as your installer properly insulates all piping. Heat tape can be used on pipes to keep unit from freezing

      by|Mar 5, 2024
        Q:Dose this come with everything needed for installing?
        by|Feb 10, 2024
        1 Answer
        Answer This Question

        A:  Hi Shayne, while every installation varies, it will come with most of the basic necessities for your installation. Venting is not included, nor is a expansion tank, which can be required on some installations.

        by|Feb 27, 2024
          Showing 1-4 of 46

          Customer Reviews

          4.6 out of 5

          • 4.6 out of 27 reviews
          • 100% recommend this product
          Filter by:
          Showing 1-10 of 27 reviews
          Homeowner install Rinnai 140,000 btu Nat. Gas.
          I just purchased and installed this Non-Condensing unit in April 2024. I replaced a 20 yr. old Bosch Aqua Star unit. I had to make minor changes to the gas line, both hot and cold water lines and electrical. The venting had to be ordered separate. A better explanation is needed showing the venting difference between a condensing and non-condensing unit. I could have saved money on the venting costs if I had ordered a condensing unit as I had a drain handy. Works perfect right out of the box.
            • Recommended
            Worked perfect right out of the box with no adjustments needed. Wish I had read more on the difference between the condensing and non-condensing venting requirements. Had it for two days. Thus far it works perfect. Delivery to the Home Depot store was 48 hrs. after I ordered it. Perfect condition.
            • Verified Purchase
            • Verified Purchase
            • Verified Purchase
            Disappointed because I shopped around for the best price and bought this one. Only upon receiving it did I see in the installation Manuel the need for other parts that required spending several hundred dollars more. If I knew this it might have made my purchase different.
            Response from Rinnai Product ExpertMar 18, 2024
            We are sorry to see you are disappointed. While we do have a competitive price point, the unit is not a one size fits all for our customers. At times it can require more up front to switch from a tank to any brand tankless. However, the savings will come many years down the road when it is time to replace your unit and you require little if anything outside of the new unit. RinnaiAmerica
            • Verified Purchase
            I have to say being my first time ever installing any water heater, more or less the tankless, it was not at all difficult. The hardest part was cutting the concentric vent. It’s working great and I absolutely love it. I did have to up the temperature to 140 from the default of 120.
            • Verified Purchase
            The water heater came with NONE of the things to make it work. All the parts needed to make it work were over $100 each. Also, the water heater came broken! I will never buy this again and never advise anyone to buy it either! Terrible product!
            Response from Rinnai Product ExpertFeb 21, 2024
            I am so sorry to see this review. It sounds like the unit may have been damaged in shipment and normally you are able to return to Home Depot for refund or exchange. We do provide the basics, but everyone's set up is different. Some customers may have to purchase more or even upsize their gas lines. While it is a larger expense up front our product, with proper maintenance last on average 10-20 years and decreases dramatically in price when you replace it many years later. RinnaiAmerica
            • Verified Purchase
            • Verified Purchase
            We are still adjusting to the new heater.
            • Verified Purchase
            Dislike: unable to adjust temperature Install went smoothly
            • Verified Purchase
            Showing 1-10 of 27 reviews

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