Looking Beyond the Rinnai REP199eN Smart-Circ Natural Gas Tankless Water Heater? 6 Alternatives Worth a Look
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The rinnai rep199en smart circ natural gas tankless water heater delivers 7.6 GPM of hot water with built-in smart recirculation. Its compact outdoor design fits tight spaces while learning your usage patterns to save energy. This unit suits homes that value convenience and precise flow management without a separate pump system.
You might look elsewhere if you need higher flow rates, different fuel options, or indoor installation. Some alternatives offer greater capacity for larger families, while others provide more affordable basic functionality. This list includes 6 options that share key specifications like natural gas fuel and outdoor suitability. Each alternative overlaps with the Rinnai’s core capabilities, allowing you to compare specs like GPM, dimensions, and venting types to find the best fit for your specific needs.
Our top pick: Rinnai Smart-Circ Outdoor Natural Gas Water Heater.
How alternatives compare to Rinnai
Ranein 8.5 GPM Outdoor Natural Gas Water Heater
The Ranein unit offers a higher stated flow rate of 8.5 GPM compared to the Rinnai’s 7.6 GPM. It shares the outdoor natural gas installation requirement. This model includes dedicated freeze protection, which the Rinnai does not explicitly list. You gain capacity for high-demand applications but lose the intelligent recirculation pump. The Ranein prioritizes raw output and weather resistance over smart scheduling. It fits users who need strong flow in cold climates without managing app settings. The physical footprint is slightly wider than the Rinnai. You choose this if freeze risk is your main concern.
APUS 190,000 BTU Outdoor Natural Gas Water Heater
The APUS heater provides 8.1 GPM, exceeding the Rinnai’s 7.6 GPM flow rate. It targets outdoor natural gas setups similar to the original. This model emphasizes smart temperature control via an app, offering precise digital management. You get enhanced connectivity but sacrifice the built-in recirculation pump found in the Rinnai. The APUS dimensions are notably narrower, fitting into tighter wall spaces. It suits buyers who want granular temperature adjustments through a mobile interface. The trade-off is the absence of the learning algorithm that optimizes pump usage. Select this for app-driven precision rather than automated convenience.
Rinnai 7.6 GPM Outdoor Natural Gas Water Heater
This Rinnai model shares the same outdoor natural gas design but focuses on compact installation. It lists a size of 9.8 GPM in specs, differing from the original’s 7.6 GPM rating. The unit lacks the Smart-Circ recirculation technology, removing the intelligent pump feature. You gain a potentially higher flow capacity but lose energy-saving scheduling. The dimensions match the original Rinnai REP199eN exactly. This choice suits those who need maximum space efficiency and raw flow without smart features. It is a solid option for tight outdoor spaces where recirculation is handled separately. You prioritize physical footprint and basic reliability over automated water management.
Westinghouse 8.1 GPM Outdoor Natural Gas Heater
The Westinghouse unit delivers 8.1 GPM, offering more flow than the Rinnai’s 7.6 GPM. It is designed for outdoor natural gas installation. This model highlights stable temperature control and certified outdoor durability. You receive precise thermal regulation but miss the built-in recirculation pump and learning algorithm. The physical size is larger, with a width of 17.1 inches compared to the Rinnai’s 14.1 inches. It fits whole-home setups where temperature consistency is critical. The trade-off is reduced compactness and lack of smart scheduling. Choose this if you value steady hot water output and durability over automated efficiency features.
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
The Rheem heater provides 9.5 GPM, significantly higher than the Rinnai’s 7.6 GPM. It supports outdoor natural gas use and includes WiFi connectivity. You gain robust flow capacity for large families and remote monitoring capabilities. However, it lacks the intelligent recirculation pump and learning features of the Rinnai. The unit is non-condensing, similar to the original. The physical dimensions are more compact in height but narrower in width. This model suits users who prioritize raw capacity and manual control over smart automation. You trade the energy-saving recirculation algorithm for higher flow and digital access. It is ideal for high-demand households without needing scheduled pump operation.
Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater
The Rinnai RUS75eN offers 7.5 GPM, slightly less than the original’s 7.6 GPM. It is an outdoor natural gas unit without the Smart-Circ recirculation system. You lose the intelligent pump and energy-saving scheduling features entirely. The physical dimensions are much larger, with a height of 35 inches versus 24.6 inches. This model suits homes needing high flow for multiple fixtures with flexible venting options. It is a basic tankless solution without smart enhancements. You choose this for proven Rinnai reliability and multi-appliance capacity. The trade-off is the absence of recirculation convenience and a larger installation footprint. It fits spaces where size is less critical than flow volume.
Quick picks
Our 7 picks
Rinnai Smart-Circ Outdoor Natural Gas Water Heater
Best for: outdoor homes needing smart recirculation
- Fuel Type
- Natural Gas
- Flow Rate
- 7.9 GPM
- BTU
- 199k BTU
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 inches
View on Amazon: Rinnai Smart-Circ Outdoor Natural Gas Water Heater Affiliate link
This Rinnai unit delivers 7.6 GPM of hot water using natural gas. It features a built-in recirculation pump with Smart-Circ technology to learn your usage patterns. The compact design measures 24.6 x 14.1 x 10.8 inches. It is built for outdoor installation. You get a 15-year heat exchanger warranty. This model suits homes needing steady flow with energy-efficient recirculation.
Pros
- 7.6 GPM flow rate for up to 6 fixtures
- Built-in Smart-Circ recirculation pump
- Compact 24.6 x 14.1 x 10.8 inch size
- 15-year heat exchanger warranty
Cons
- WiFi control module sold separately
- Non-condensing design limits efficiency
- Outdoor installation only
Good fit if
- You need consistent hot water for multiple bathrooms
- You want energy savings from smart recirculation
- You have outdoor space for installation
Skip if
- You require indoor installation
- You want built-in WiFi connectivity
- You need a condensing unit for higher efficiency
Verdict: Rinnai Smart-Circ 7.6 GPM Outdoor Gas Heater fits households that value smart recirculation and reliable flow. It is ideal for outdoor setups where you want to minimize hot water wait times without a separate pump.
Ranein 8.5 GPM Outdoor Natural Gas Water Heater
Best for: High-flow outdoor applications with freeze risks
- Fuel Type
- Natural Gas
- Flow Rate
- 8.5 GPM
- BTU
- 190,000 BTU
- Installation Location
- Outdoor
- Dimensions
- 24.3 x 15.1 x 15.1 in
- Weight
- 44 pounds
View on Amazon: Ranein 8.5 GPM Outdoor Natural Gas Water Heater Affiliate link
The Ranein RHO19K-NG delivers 190,000 BTU of heating power and an 8.5 GPM flow rate for outdoor use. Its compact 24.3-inch height and 44-pound weight fit standard 3/4-inch NPT connections. Anti-freeze protection safeguards the unit in cold weather. This model suits households needing high-volume hot water at multiple outlets without waiting for tank preheating.
Pros
- 190,000 BTU/hr heating capacity
- 8.5 GPM maximum flow rate
- Under-mounted fan reduces smoke backflow
- Anti-freeze protection included
- Compact 24.3 x 15.1 x 8.1 inch size
Cons
- Not recommended for altitudes over 2,000 feet
- Attributes list 5.0 GPM, conflicting with 8.5 GPM spec
- No smart connectivity or remote control listed
Good fit if
- You need high flow rates for multiple outdoor outlets
- You require anti-freeze protection for cold climates
- You want a compact unit for limited wall space
Skip if
- You live above 2,000 feet elevation
- You need indoor installation capabilities
- You require smart home integration
Verdict: Ranein 8.5 GPM Natural Gas Outdoor Heater provides strong performance for high-demand outdoor setups. It fits users who prioritize flow rate and freeze protection over smart features or high-altitude operation.
APUS 190,000 BTU Outdoor Natural Gas Water Heater
Best for: outdoor homes needing smart temp control
- Fuel Type
- Natural Gas
- Flow Rate
- 8.1 GPM
- BTU
- 190,000 BTU
- Installation Location
- Outdoor
- Voltage
- 120V AC
- Temperature Control
- 95°F–149°F, ±1°F
View on Amazon: APUS 190,000 BTU Outdoor Natural Gas Water Heater Affiliate link
The APUS outdoor unit delivers 190,000 BTU and 8.1 GPM of hot water. It features smart temperature control via a Tuya app or wired controller, maintaining stability within ±1°F. The compact design fits outdoor spaces, and the oxygen-free copper heat exchanger offers a 0.81 UEF. It supports simultaneous use at multiple fixtures with a low minimum flow rate of 0.79 GPM.
Pros
- 8.1 GPM flow rate for whole-home supply
- Smart app and wired controller temperature adjustment
- 0.81 UEF efficiency with oxygen-free copper heat exchanger
- Low 0.79 GPM minimum flow requirement
Cons
- Requires 120V AC power connection
- Limited to outdoor installation only
- 2-year warranty coverage
Good fit if
- You need smart temperature adjustments via an app
- You want high flow for multiple simultaneous fixtures
- You have an outdoor location with 120V access
Skip if
- You require indoor installation options
- You need a warranty longer than 2 years
- You lack a 120V AC power source
Verdict: APUS 8.1 GPM Natural Gas Tankless Heater provides precise smart control and high efficiency for outdoor setups. It suits users who prioritize app-based temperature management and reliable flow for multiple fixtures.
Rinnai 7.6 GPM Outdoor Natural Gas Water Heater
Best for: compact outdoor natural gas installations
- Fuel Type
- Natural Gas
- Flow Rate
- 9.8 GPM
- BTU
- 199k BTU
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 in
- Venting Type
- Non-Condensing
View on Amazon: Rinnai 7.6 GPM Outdoor Natural Gas Water Heater Affiliate link
This Rinnai unit delivers up to 7.6 GPM of hot water for outdoor use. It runs on natural gas and measures 24.6 by 14.1 by 10.8 inches. The compact design fits small spaces while supporting six fixtures. You get a 15-year heat exchanger warranty and an LED screen for error codes. It requires professional installation and does not include a WiFi module.
Pros
- Delivers 7.6 GPM flow rate
- Compact 24.6 x 14.1 x 10.8 inch footprint
- 15-year heat exchanger warranty
- LED screen displays error codes
- Runs on natural gas
Cons
- Lower 7.6 GPM flow rate than some competitors
- WiFi control module sold separately
- No included circulation pump
Good fit if
- You need a compact outdoor unit
- You want a strong heat exchanger warranty
- You prefer natural gas fuel
Skip if
- You need more than 7.6 GPM
- You want built-in WiFi control
- You require an indoor installation
Verdict: Rinnai RE199eN Outdoor Natural Gas Heater suits those prioritizing warranty coverage and compact size over maximum flow rate. It is a solid choice for outdoor natural gas setups where space is limited.
Westinghouse 8.1 GPM Outdoor Natural Gas Heater
Best for: outdoor whole-home hot water with stable temperature
- Fuel Type
- Natural Gas
- Flow Rate
- 8.1 GPM
- BTU
- 180,000 BTU
- Installation Location
- Outdoor
- Voltage
- 120V AC
- Temperature Control
- 95–158°F, ±1°F
View on Amazon: Westinghouse 8.1 GPM Outdoor Natural Gas Heater Affiliate link
The Westinghouse HS180A0G-NG delivers 8.1 GPM at 180,000 BTU for whole-home outdoor use. Its ±1°F temperature stability prevents cold bursts. CSA certification ensures safety. It supports 3–5 fixtures simultaneously. The unit weighs 42 pounds and requires 120V AC power. It suits households needing reliable outdoor hot water with precise temperature control.
Pros
- 8.1 GPM flow rate supports multiple fixtures
- ±1°F temperature stability for consistent showers
- 180,000 BTU heating power
- CSA certified for outdoor safety
Cons
- Shorter 2-year unit warranty compared to industry standards
- Heavier 42-pound build requires sturdy mounting
- Requires 120V AC electrical connection
Good fit if
- You need outdoor installation with CSA certification
- You want precise temperature stability within ±1°F
- You require high flow for multiple simultaneous fixtures
Skip if
- You need indoor installation options
- You prefer a longer 5-year unit warranty
- You cannot provide 120V AC power
Verdict: Westinghouse 8.1 GPM Outdoor Natural Gas Heater provides stable hot water for outdoor whole-home use. It fits buyers who prioritize temperature precision and certified outdoor durability.
Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater
Best for: High-flow outdoor residential use
- Fuel Type
- Natural Gas
- Flow Rate
- 9.5 GPM
- BTU
- 199,900 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater Affiliate link
The Rheem RTG-95XLN-3 delivers 9.5 GPM of hot water at a 35°F rise, powered by 199,900 BTUs of natural gas. This non-condensing outdoor unit features a digital LED panel with ±1°F precision control. It includes built-in freeze protection and flame failure safety. The compact 20.8-inch height fits tight spaces. It suits large households needing simultaneous shower flow without a tank.
Pros
- 9.5 GPM flow rate supports 3-4 simultaneous showers
- Digital LED control with ±1°F temperature precision
- 199,900 BTU/hr output for high demand
- Built-in freeze and flame failure protection
Cons
- Non-condensing design is less efficient than condensing models
- No smart home integration or remote monitoring
- Requires professional installation for gas connection
Good fit if
- You need high flow for multiple bathrooms
- You prefer precise manual temperature adjustments
- You have outdoor space for wall mounting
Skip if
- You require Wi-Fi connectivity for remote control
- You want a condensing unit for maximum efficiency
- You need indoor installation without venting changes
Verdict: Rheem RTG-95XLN-3 9.5 GPM Natural Gas provides robust flow for large families. It fits homes prioritizing raw capacity and precise manual control over smart features.
Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater
Best for: outdoor multi-appliance hot water
- Fuel Type
- Natural Gas
- Flow Rate
- 7.5 GPM
- Installation Location
- Outdoor
- Dimensions
- 35 x 14.5 x 22 inches
View on Amazon: Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater Affiliate link
The Rinnai RUS75eN delivers up to 7.5 GPM of hot water using natural gas. This outdoor unit measures 35 x 14.5 x 22 inches. It heats water only when needed, saving energy. The system supports up to six appliances simultaneously. You get flexible venting options with PVC or CPVC pipes. This compact design fits various outdoor spaces while providing reliable performance.
Pros
- High flow rate of 7.5 GPM
- Serves up to 6 appliances
- Flexible PVC/CPVC venting options
- Compact 35-inch height
Cons
- Outdoor installation only
- Professional installation required
- 1-year labor warranty is short
Good fit if
- You need 7.5 GPM capacity
- You have outdoor space
- You want flexible venting
Skip if
- You need indoor installation
- You want DIY setup
- You need longer warranty
Verdict: Rinnai 7.5 GPM Outdoor Gas Heater suits homes needing high flow rates for multiple fixtures. It fits outdoor spaces with flexible venting needs.
Specifications side by side
| Spec | Rinnai Smart-Circ Outdoor Natural Gas Water Heater | Ranein 8.5 GPM Outdoor Natural Gas Water Heater | APUS 190,000 BTU Outdoor Natural Gas Water Heater | Rinnai 7.6 GPM Outdoor Natural Gas Water Heater | Westinghouse 8.1 GPM Outdoor Natural Gas Heater | Rheem RTG 9.5 GPM Outdoor Natural Gas Tankless Heater | Rinnai 7.5 GPM Outdoor Natural Gas Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas | Natural Gas |
| Flow Rate | 7.9 GPM | 8.5 GPM | 8.1 GPM | 9.8 GPM | 8.1 GPM | 9.5 GPM | 7.5 GPM |
| BTU | 199k BTU | 190,000 BTU | 190,000 BTU | 199k BTU | 180,000 BTU | 199,900 BTU/hr | not stated |
| Installation Location | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor |
| Voltage | not stated | not stated | 120V AC | not stated | 120V AC | not stated | not stated |
| Temperature Control | not stated | not stated | 95°F–149°F, ±1°F | not stated | 95–158°F, ±1°F | ±1°F | not stated |
| Certification | not stated | not stated | not stated | not stated | CSA | CSA | not stated |
| Dimensions | 24.6 x 14.1 x 10.8 inches | 24.3 x 15.1 x 15.1 in | 22.48 × 15.51 × 6.54 in | 24.6 x 14.1 x 10.8 in | 26.8 x 17.1 x 17.1 inches | 20.8 x 13.5 x 9.4 inches | 35 x 14.5 x 22 inches |
| Use | not stated | not stated | not stated | not stated | Whole House | not stated | not stated |
| Venting Type | not stated | not stated | not stated | Non-Condensing | not stated | Non-Condensing | not stated |
| Features | not stated | not stated | not stated | not stated | not stated | WiFi | not stated |
| Weight | not stated | 44 pounds | 42.5 pounds | 53.3 pounds | 42 pounds | 39.3 pounds | not stated |
| Size | 7.9 GPM | 8.5 GPM Outdoor | not stated | 9.8 GPM | not stated | 9.5 GPM (No WiFi) | 7.5 GPM |
| Color | Silver | Gray-NG | Gray | Silver | Grey 81NO | Gray | Outdoor Installation |
| Model | REU-VEP2737WD-US-N | RHO19K-NG | AP-AWH-W26NG | REU-VE2737WD-US-N | HS180A0G-NG | RTG-95XLN-3 | RUS75eN |
If you plan to run outdoor gas lines, you can compare the best natural gas patio heaters by heat output.
Frequently asked questions
Which outdoor natural gas heater has the highest flow rate?
The Rheem RTG-95XLN-3 offers the highest flow rate at 9.5 GPM. It is designed for large families needing robust capacity. This unit is non-condensing and features WiFi connectivity. It prioritizes raw performance over smart temperature management. The compact design measures 13.5 inches wide and weighs 39.3 pounds. It fits outdoor residential use where high demand is common.
How does the Ranein unit compare for freeze protection?
The Ranein 8.5 GPM model includes dedicated freeze protection. This feature is not explicitly listed for the Rinnai Smart-Circ. The Ranein unit provides 8.5 GPM of flow for high-demand setups. It weighs 44 pounds and measures 15.1 inches wide. It suits users who prioritize freeze safety and strong flow over smart app features. It is designed for outdoor natural gas installation.
Which model allows app-based temperature control?
The APUS 190,000 BTU heater provides precise smart control via an app. It allows for remote temperature management and reliable flow for multiple fixtures. This model weighs 42.5 pounds and measures 6.54 inches wide. It is ideal for outdoor homes needing smart temp control. The unit delivers 8.1 GPM of hot water. It focuses on efficiency and digital management for outdoor setups.
Is there a compact option with strong warranty coverage?
The Rinnai RE199eN Outdoor Natural Gas Heater is a solid choice for compact spaces. It suits those prioritizing warranty coverage and compact size. This unit delivers 9.8 GPM of flow. It measures 14.1 inches wide and weighs 53.3 pounds. It is a non-condensing model designed for outdoor natural gas installations. It fits well where space is limited but high flow is needed.
Which heater offers stable temperature for whole-home use?
The Westinghouse 8.1 GPM Outdoor Natural Gas Heater provides stable hot water for whole-home use. It fits buyers who prioritize temperature precision and certified outdoor durability. The unit weighs 42 pounds and measures 17.1 inches wide. It delivers consistent performance for outdoor installations. It is designed for natural gas and focuses on reliable flow for multiple fixtures without digital complications.
What is the best choice for multi-appliance outdoor setups?
The Rinnai 7.5 GPM Outdoor Gas Heater suits homes needing high flow for multiple fixtures. It is designed for outdoor spaces with flexible venting needs. This unit measures 14.5 inches wide and 35 inches tall. It delivers 7.5 GPM of hot water. It is a non-condensing natural gas model. It fits well where you need reliable flow for several simultaneous uses outdoors.