10 Rinnai V65in Propane Tankless Water Heater Review of 2026 For Continuous Hot Water

1

Rinnai RE199eP Non-Condensing Propane Tankless Water Heater, Up to 9.8

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  9.6
• Brand
  Rinnai

Key specs2

Venting configuration

This outdoor unit eliminates interior flue runs by exhausting directly into open air. Professional outdoor mounting requires verifying regional freezing weather conditions.

Maximum flow rating

Up to 9.8 GPM (199,000 BTU)

Pros & cons43

Pros

• Generates up to 9.8 GPM with 199,000 BTU output to support up to 6 fixtures at once
• Outdoor installation avoids cutting interior exhaust venting through walls or roofs
• Long 15-year residential guarantee on the heat exchanger alongside a 5-year labor term
• Built-in LED screen provides visible service reminders and diagnostic error codes

Cons

• Outdoor design is unsuitable if you need a dedicated indoor utility room heater
• Controlr WiFi module and internal recirculation pump are sold separately
• Requires checking local groundwater temperatures to determine real-world winter flow rate

2

Rinnai RE160iP Non-Condensing Propane Tankless Water Heater

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  9.2
• Brand
  Rinnai

Key specs2

Indoor space requirements

Measuring 10.77 by 14.05 by 27.28 inches, this indoor model mounts flush to vertical wall studs. Dedicated non-condensing indoor venting is required.

Simultaneous fixture capacity

Up to 6.1 GPM (5 fixtures at once)

Pros & cons43

Pros

• Indoor wall-mount design fits compact utility closets at 10.77 by 14.05 by 27.28 inches
• Delivers up to 6.6 GPM flow to supply hot water for up to 5 fixtures at once
• Clear LED screen displays system error codes and required service reminders
• Features a 15-year heat exchanger and 5-year labor residential factory warranty

Cons

• Requires dedicated indoor exhaust venting pipes that are not included in the box
• Wireless mobile controls require purchasing the optional Controlr module separately
• At 48.5 pounds, the unit requires secure wall stud mounting during installation

3

Rinnai RE199iP Non-Condensing Propane Tankless Water Heater

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  9.1
• Brand
  Rinnai

Key specs2

Indoor flow delivery

Up to 9.8 GPM (6 fixtures at once)

Heat exchanger coverage

Rinnai includes a 15-year residential guarantee on the heat exchanger, backed by 5 years of labor coverage and 1 year for parts.

Pros & cons43

Pros

• High 9.8 GPM flow capacity handles simultaneous demands across up to 6 fixtures indoors
• Compact suitcase profile measures 27.28 inches tall for space-saving indoor wall mounting
• Backed by a 15-year heat exchanger and 5-year labor residential guarantee
• Digital LED display communicates maintenance reminders and operating error codes

Cons

• Indoor setup requires routing dedicated non-condensing flue venting through the home
• Internal recirculation pump is omitted on this base model and requires the REP version
• Heaviest indoor model in the RE line at 53.4 pounds requiring sturdy wall bracket support

4

Rinnai RE160eP Non-Condensing Propane Tankless Water Heater

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  9.0
• Brand
  Rinnai

Key specs2

Exterior mounting clearance

The compact 24.64-inch-tall silver cabinet mounts directly to exterior siding or masonry, avoiding any need to penetrate interior ceilings with exhaust pipe.

Simultaneous fixture capacity

Up to 6.1 GPM (5 fixtures at once)

Pros & cons43

Pros

• Exterior wall mounting frees up indoor utility space without needing indoor vent ducting
• Provides up to 6.6 GPM to handle up to 5 household fixtures running simultaneously
• Protected by a 15-year heat exchanger, 5-year labor, and 1-year parts residential warranty
• Integrated LED interface alerts you to required service needs and diagnostic codes

Cons

• Outdoor placement leaves the unit exposed to exterior weather and ambient temperatures
• Remote WiFi management requires adding an optional Controlr module
• Gas line supply size must be verified against local propane piping requirements

5

Rinnai RUS65EP Tankless Hot Water Heater, Propane

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  8.9
• Brand
  Rinnai

Key specs2

Flue venting options

Supports multiple venting paths including PVC or CPVC pipe when paired with the Ubbink Concentric to Twin Pipe adaptor.

Factory warranty term

12-yr heat exchanger, 5-yr parts, 1-yr labor

Pros & cons43

Pros

• Supplies up to 6.5 GPM continuous hot water flow serving up to 5 appliances at once
• Supports flexible venting adaptations including PVC or CPVC with a twin-pipe adapter
• Backed by a 12-year heat exchanger and 5-year parts residential factory warranty
• Propane operation heats water on demand only when fixtures are actively running

Cons

• Substantially larger casing at 35 inches tall and 63 pounds compared to newer RE models
• Concentric to twin pipe Ubbink adaptor is not included with the standard chassis
• Outdoor placement requires adequate exterior wall clearance and pipe freeze protection

6

Rinnai RE140iP Non-Condensing Propane Tankless Water Heater, Up to 5.3

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  8.8
• Brand
  Rinnai

Key specs2

Propane burner rating

140,000 BTU (up to 5.3 GPM)

Indoor space requirements

Weighing 48.5 pounds with a 27.28-inch height, this indoor heater requires dedicated wall hanging and non-condensing flue venting through the roof or sidewall.

Pros & cons43

Pros

• Lower 140,000 BTU burner input suits smaller homes with standard propane line capacity
• Delivers up to 5.3 GPM to handle up to 5 fixtures during moderate temperature demand
• Covered by a 15-year heat exchanger and 5-year labor residential factory guarantee
• Onboard LED screen presents quick diagnostic codes and routine maintenance reminders

Cons

• 5.3 GPM peak flow rate can restrict simultaneous showers in cold groundwater regions
• Indoor exhaust venting must be sourced and routed separately to the home exterior
• WiFi module is not integrated and must be purchased as an add-on accessory

7

Rinnai RUCS65IP Tankless Hot Water Heater, Propane

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  8.7
• Brand
  Rinnai

Key specs2

Flue venting options

The indoor chassis accommodates multiple venting runs, including PVC and CPVC pipes through an optional Ubbink concentric adapter.

Concentric pipe adaptation

Twin pipe PVC/CPVC via Ubbink adapter

Pros & cons43

Pros

• Delivers up to 6.5 GPM output to reliably supply up to 5 appliances simultaneously indoors
• Compatible with PVC or CPVC pipe when using the Ubbink concentric-to-twin adapter
• 12-year heat exchanger and 5-year parts warranty protect your indoor heating investment
• Only burns propane when water is running to prevent standby storage tank losses

Cons

• Large 35-inch cabinet height demands more vertical wall space than compact RE units
• Weighs 62 pounds, requiring secure wall mounting and adequate structural backing
• Concentric adapter hardware for twin-pipe venting setups must be acquired separately

8

Rinnai RE180eP Non-Condensing Propane Tankless Water Heater

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  7.8
• Brand
  Rinnai

Key specs2

Outdoor placement

Engineered specifically for outdoor installation, this heater operates without indoor flue piping while keeping your utility closet open for storage.

Peak flow rate

Up to 8.5 GPM (6.9 GPM / 5 fixtures)

Pros & cons43

Pros

• High 8.5 GPM flow rating supplies plenty of continuous volume for up to 5 fixtures
• Outdoor mounting eliminates the need for indoor penetrations or venting runs
• Generous residential warranty includes 15 years on heat exchanger and 5 years on labor
• Digital LED display provides simple service reminders and operating error codes

Cons

• Not engineered for indoor mechanical rooms or basements requiring direct indoor flue runs
• WiFi remote connectivity requires adding the proprietary Controlr module
• Real flow drops below 8.5 GPM when incoming winter groundwater temperatures decline

9

Rinnai RE180iP Non-Condensing Propane Tankless Water Heater, Up to 8.5

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  7.8
• Brand
  Rinnai

Key specs2

High-demand fixture support

Up to 8.5 GPM (7 fixtures at once)

Burner heat input

The 180,000 BTU propane burner delivers high-volume hot water indoors. Confirm your home gas supply line meets the fuel volume requirements before installation.

Pros & cons43

Pros

• Generates 180,000 BTU delivering up to 8.5 GPM to run up to 7 fixtures concurrently
• Indoor installation safeguards the water heater from extreme outdoor weather conditions
• Includes a 15-year residential guarantee on the heat exchanger and 5 years for labor
• Internal layout improves service access while the LED screen displays system diagnostics

Cons

• 180,000 BTU rating requires verifying existing indoor propane supply line diameter
• Indoor installation demands dedicated non-condensing venting run through the structure
• At 53.75 pounds, it requires heavy-duty wall mounting and careful indoor pipe alignment

10

Rinnai RE140eP Non-Condensing Propane Tankless Water Heater

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  7.7
• Brand
  Rinnai

Key specs2

Compact exterior profile

10.77 x 14.05 x 24.64 inches (50.00 lbs)

Diagnostic monitoring

The integrated front LED screen alerts you to routine maintenance requirements and flashes specific error codes if operation is interrupted.

Pros & cons43

Pros

• Exterior wall setup saves interior floor space and eliminates flue pipe installations
• Delivers up to 5.3 GPM to satisfy hot water demands for up to 5 fixtures at once
• Built-in LED panel presents clear error diagnostics and routine maintenance reminders
• Robust factory coverage provides a 15-year heat exchanger and 5-year labor guarantee

Cons

• Cannot be installed indoors if your setup requires an interior utility room heater
• 5.3 GPM maximum output provides less buffer for multiple fixtures during freezing weather
• Does not include the Controlr module required for wireless mobile connectivity

Last update on 2026-10-10 / Affiliate links / Images, Product Titles, and Product Highlights from Amazon Product Advertising API

Will a 6.5 GPM propane tankless water heater run multiple fixtures at the same time?

It depends on your incoming water temperature and how many fixtures draw hot water at the exact same moment. A 6.5 GPM unit like the Rinnai RUCS65IP conserves energy by heating only when necessary to deliver continuous hot water throughout the home. In colder regions where incoming ground water is cold, large simultaneous demands can push capacity limits. If your household frequently runs multiple showers alongside appliances, stepping up to an 8.5 GPM model like the RE180iP or a 9.8 GPM model like the RE199iP helps maintain consistent flow without drop-offs.

What venting options are required for an indoor propane tankless water heater?

Indoor units require dedicated exhaust routing to safely discharge combustion byproducts outside your home. Models like the Rinnai RUCS65IP feature multiple venting options to support flexible placement across different utility layouts. Because exhaust pipe materials, termination clearances, and wall penetrations depend on your specific setup, check the manufacturer manual for your exact model before installation. If you are comparing indoor gas appliances, checking safe indoor propane heaters can give you a clear sense of proper venting and clearance practices.

What is the difference between indoor and outdoor Rinnai propane tankless heaters?

Indoor models are built for utility rooms or interior closets and require dedicated flue venting, while outdoor models vent directly into open exterior air. Dimensions also differ between the two configurations. For example, the indoor RE160iP measures 10.77 x 14.05 x 27.28 inches, whereas the outdoor RE160eP measures 10.77 x 14.05 x 24.64 inches. Outdoor units eliminate the need to run flue piping through interior walls or roofs, but they must remain in outdoor locations where climate conditions permit.

What propane BTU supply do indoor Rinnai tankless units need?

Propane heat ratings vary according to the heater capacity and flow rate. The indoor Rinnai RE140iP provides up to 5.3 GPM with a 140,000 BTU rating, while the higher-capacity RE180iP delivers up to 8.5 GPM and requires 180,000 BTU. Your propane tank regulator and supply piping must deliver enough gas volume to satisfy these maximum firing rates without pressure dips. Confirm your gas line diameter and regulator pressure with your propane supplier to verify that your system can supply full demand.

Should I select a 6.6 GPM model or upgrade to an 8.5 or 9.8 GPM heater?

Choose your capacity based on peak household hot water usage rather than home size. The 6.6 GPM Rinnai RE160iP covers standard simultaneous demands in moderate climates. If you have a busy home with family members using showers, sinks, and laundry at the exact same hour, the 8.5 GPM RE180iP or 9.8 GPM RE199iP provides the higher flow needed to avoid lukewarm interruptions. If you are debating between gas lines and electrical service upgrades, compare requirements with electric tankless water heaters for home to see what fits your utility setup best.

How much wall space does an indoor propane tankless heater occupy?

Indoor tankless heaters use a compact profile roughly the size of a small suitcase to save floor space. The silver indoor models, including the RE140iP, RE160iP, RE180iP, and RE199iP, all measure 10.77 x 14.05 x 27.28 inches. The RE140iP and RE160iP weigh 48.5 pounds, the RE199iP weighs 53.40036910164 pounds, and the RE180iP weighs 53.75090409822 Pounds. In comparison, the white Rinnai RUCS65IP measures 22 x 14.5 x 35 inches and weighs 62 Pounds. Check your wall framing and clearance to combustibles against the installation diagrams before mounting.