10 Rinnai Re180ep Tankless Water Heater Review of 2026 For Outdoor Propane Homes

1

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

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  8.8
• Brand
  Rinnai

Key specs2

Venting and Location

Indoor installation with dedicated venting

Heating Capacity

140,000 BTU / 5.3 GPM maximum

Pros & cons43

Pros

• Dedicated propane design handles up to 5.3 GPM across up to 5 simultaneous fixtures without fuel conversion kits
• Heat exchanger carries 15-year warranty alongside 5-year parts and 1-year labor coverage
• Compact 10.77 x 14.05 x 27.28-inch chassis fits tight utility spaces while weighing 48.5 pounds
• Front LED screen provides direct service reminders and diagnostic error codes

Cons

• Indoor configuration requires dedicated venting through the home rather than direct outdoor mounting
• Maximum 140,000 BTU output delivers lower flow rates than 180,000 BTU models during winter conditions
• WiFi connectivity requires purchasing the separate Controlr module

2

Rinnai RE180eP Non-Condensing Propane Tankless Water Heater

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  7.8
• Brand
  Rinnai

Key specs2

Exterior Mounting Advantage

Built specifically for outdoor installation, eliminating indoor exhaust venting while delivering up to 6.9 GPM on liquid propane.

Warranty Coverage

• 15-year heat exchanger warranty
• 5-year parts warranty
• 1-year labor warranty

Pros & cons43

Pros

• Outdoor propane design eliminates indoor venting ducts and avoids indoor footprint requirements
• Supplies up to 6.9 GPM across 5 simultaneous fixtures with an 8.5 GPM maximum flow rating
• Backed by a 15-year residential warranty on the heat exchanger, 5 years on parts, and 1 year on labor
• Built-in LED screen alerts users to routine service needs and system status

Cons

• Exterior placement requires checking local climate limits against cold incoming groundwater
• Non-condensing design does not match the 0.97 UEF efficiency of condensing units
• WiFi monitoring requires purchasing the Rinnai Controlr module separately

3

Rinnai RE180iN Non-Condensing Natural Gas Tankless Water Heater, Up to

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  8.5
• Brand
  Rinnai

Key specs2

Fuel and Flow Output

Operates exclusively on natural gas with an 180,000 BTU burner and up to 8.5 GPM total rating.

Venting and Location

Indoor installation only

Pros & cons33

Pros

• Delivers 180,000 BTU heating capacity supporting up to 6.9 GPM and 5 fixtures at once
• Features long-term warranty support with 15 years on the heat exchanger and 5 years on parts
• Front LED screen displays diagnostic codes for straightforward maintenance tracking

Cons

• Natural gas fuel configuration is incompatible with liquid propane tanks without alternative hardware
• Indoor installation requires dedicated flue venting through exterior walls or rooflines
• At 54 pounds, the cabinet is heavier than the outdoor RE180eP counterpart

4

Rinnai V53DeN Natural Gas Tankless Water Heater - 5.3 GPM,

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  8.5
• Brand
  Rinnai

Key specs2

Exterior Footprint

18 x 18 x 31.2 inches / 33 pounds

Fixture Support

Supports up to 4 appliances with an outdoor-mounted natural gas supply.

Pros & cons33

Pros

• Exterior wall-mount setup requires no indoor exhaust flue or interior utility space
• Delivers 5.3 GPM flow capacity to support hot water for up to 4 appliances
• Lightweight 33-pound chassis makes physical mounting simpler than larger series units

Cons

• Natural gas connection will not run on standard household propane systems
• Heat exchanger warranty lasts 10 years compared to the 15-year term on RE series heaters
• Lacks the internal LED diagnostic display featured on RE-series units

5

NEW Rinnai RX130iN Condensing Smart Sense Natural Gas or Propane

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  8.1
• Brand
  Rinnai

Key specs2

Dual Fuel Flexibility

Smart Sense valve adapts to either propane or natural gas, while Versa Vent supports indoor or outdoor setup.

Efficiency Rating

0.97 UEF condensing rating

Pros & cons43

Pros

• Smart Sense gas control system operates on either propane or natural gas supplies
• High-efficiency condensing operation reaches a 0.97 Uniform Energy Factor
• Quick Flush feature simplifies routine descaling and maintenance tasks
• Versa Vent technology allows indoor or outdoor placement with proper vent accessories

Cons

• Outdoor installation requires purchasing an additional RX-OVC vent cap
• Heating output is limited to 130,000 BTU and up to 7.1 GPM across 4 fixtures
• Rinnai Central App and WiFi control depend on an optional Controlr module

6

H98-510-S tankless Water Heater Filter Kit for Rinnai tankless Water

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  7.8
• Brand
  VYH

Key specs2

Maintenance Package Contents

• 2 water inlet screen assemblies
• 1 filter removal tool
• 0.94 x 1.8 x 0.78-inch screen size

Service Frequency

Replace every 2 to 3 months

Pros & cons32

Pros

• Includes two replacement filter screens and a dedicated removal tool
• Five-minute replacement process restores water inlet flow without prolonged shutdown
• Compact 0.94 x 1.8 x 0.78-inch filter screen matches standard Rinnai inlet assemblies

Cons

• Recommended replacement interval every 2 to 3 months requires ongoing maintenance attention
• Does not include the specialized slip-resistant removal wrenches included with upgraded kits

7

H98-510-S Tankless Water Heater Filter Kit for Rinnai Tankless Water

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  7.6
• Brand
  VYH

Key specs2

Tool Compatibility

Works with power screwdrivers, hex wrenches, Allen wrenches, or direct manual turning.

Housing Protection

Slip-resistant wrenches protect plastic threads

Pros & cons32

Pros

• Includes 2 inlet screens, 1 multi-use tool, and 2 specialized removal wrenches
• Dedicated wrenches fit filter cartridges snugly to prevent slipping and damaged threads
• Multi-use tool works with power screwdrivers, hex wrenches, Allen wrenches, or by hand

Cons

• Inlet screens require replacement every 2 to 3 months for optimal sediment filtration
• Buyers must verify circuit and housing compatibility before installing on specific Rinnai units

8

NEW Rinnai RX160iN Condensing Smart Sense Natural Gas or Propane

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  7.5
• Brand
  Rinnai

Key specs2

Dual Fuel Flexibility

Automatically adjusts to propane or natural gas lines while supporting up to 6 fixtures.

Efficiency Rating

0.97 UEF with Quick Flush

Pros & cons43

Pros

• Delivers up to 9 GPM and 160,000 BTU to run up to 6 plumbing fixtures at once
• Smart Sense technology works with either propane or natural gas supply lines
• Reaches a high-efficiency 0.97 UEF condensing rating to reduce fuel waste
• Quick Flush system simplifies flushing cycles during routine servicing

Cons

• Outdoor mounting requires purchasing a separate RX-OVC vent cap
• Larger 19 x 19 x 31-inch dimensions take up more physical clearance than non-condensing models
• Wireless monitoring requires purchasing the optional Controlr module

9

Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater, Up to

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  7.3
• Brand
  Rinnai

Key specs2

Heating Capacity

199,000 BTU / up to 9.8 GPM

Recirculation Limitation

Does not include built-in recirculation; whole-home recirculation requires the REP199iN model.

Pros & cons33

Pros

• Powerful 199,000 BTU burner supplies up to 9.8 GPM for high-demand whole-house use
• LED diagnostic screen displays fault codes and proactive service reminders
• Protected by a 15-year warranty on the heat exchanger and 5 years on replacement parts

Cons

• Configured strictly for indoor natural gas lines and cannot connect to propane without conversion
• High output non-condensing design requires dedicated interior flue venting through building walls
• Built-in recirculation is absent and requires stepping up to the REP199iN model

10

H98-510-S tankless Water Heater Filter for Rinnai tankless Water Heater

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  7.2
• Brand
  VYH

Key specs2

Package Contents

• 2 inlet screen assemblies
• 0.94 x 1.8 x 0.78-inch screen dimensions
• Filter removal tools not included

Service Frequency

Replace every 2 to 3 months

Pros & cons32

Pros

• Provides two replacement inlet screen assemblies sized at 0.94 x 1.8 x 0.78 inches
• Direct five-minute installation restores water heater flow and inlet filtration
• Restores sediment filtration performance on compatible Rinnai inlet assemblies

Cons

• Does not include removal wrenches or extraction tools included with larger kits
• Screens require cleaning or replacement every 2 to 3 months to prevent flow drops

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

Can the Rinnai RE180eP handle multiple showers at the same time?

Yes, as long as your combined water usage does not exceed its maximum flow rate of 8.5 GPM. The Rinnai RE180eP is an on-demand, non-condensing outdoor heater that only fires when a tap opens, conserving fuel while supplying continuous hot water. If your household runs several high-flow fixtures simultaneously during cold weather when incoming water temperatures drop, total flow will adjust to maintain output temperature. Check the flow rate ratings of your showerheads and faucets to verify your total simultaneous demand stays under 8.5 GPM.

What are the exterior setup requirements for this outdoor propane water heater?

The Rinnai RE180eP mounts directly to an outside wall and connects to an external liquid propane line. Because it discharges exhaust directly into the open air, it eliminates the indoor venting pipes and wall penetrations required by indoor models like the RE180iN. The unit measures 10.77 by 14.05 by 24.64 inches and weighs 50.02 pounds, occupying about the same wall space as a small suitcase. Always verify your exterior mounting location allows adequate clearance from doors, windows, and propane tank regulator vents before running plumbing lines.

How often does the water inlet screen assembly require maintenance?

You should inspect and clean or replace the inlet screen assembly roughly every 2 to 3 months to maintain proper flow. Compatible replacements like the H98-510-S filter kit catch sediment and scale before water reaches the heating components. Servicing the screen is straightforward because the part fits standard removal tools, hex wrenches, Allen wrenches, or power screwdrivers. Keeping this inlet filter clear protects the internal water path from mineral clogs that can restrict system pressure.

How does the RE180eP differ from the indoor RE180iN model?

The RE180eP is built strictly for exterior installation using liquid propane, while the RE180iN is engineered for indoor installation on a natural gas line. Both units provide up to 8.5 GPM, but the indoor natural gas RE180iN produces 180,000 BTU, stands slightly taller at 27.28 inches, and weighs 54 pounds. The outdoor RE180eP is lighter at 50.02 pounds and 24.64 inches tall, making it easier to position on an outside wall without taking up interior closet or basement space.

Can the RE180eP be converted to run on natural gas?

No, the RE180eP is engineered specifically for liquid propane and is not a dual-fuel field unit. Rinnai designates fuel configuration in the model name, where the "P" indicates propane and the "e" indicates an exterior cabinet. If your home uses natural gas or requires fuel flexibility, models like the RX130iN or RX160iN feature Smart Sense technology to operate on either natural gas or propane. Confirm your fuel source before ordering to avoid costly utility line rework.

Should you install an outdoor tankless unit or a dedicated point-of-use heater?

A whole-home outdoor unit like the 8.5 GPM RE180eP is designed to supply your entire house from a central propane line, rather than heating a single faucet. If your goal is simply eliminating the wait for warm water at an isolated bathroom vanity or kitchen sink, pairing your setup with an instant hot water heater for under-sink cabinets may be more practical. For complete household hot water across sinks, appliances, and showers, the RE180eP delivers the central flow capacity you need.