6 Best Alternatives to the Rinnai RUS65EP Tankless Hot Water (2026)
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The Rinnai RUS65EP delivers steady hot water for medium homes with its 6.5 GPM flow rate and compact outdoor design. If you are searching for rinnai rus65ep tankless hot water alternatives, you likely need different specifications or a different brand. Some buyers want higher flow rates for larger families, while others prefer indoor installation or smart connectivity features. The original unit is reliable, but its specific propane and outdoor constraints may not fit every home layout.
This list features 6 units chosen because their specs overlap with the Rinnai model. We compared flow rates, fuel types, and dimensions to find practical substitutes. You will see options with higher GPM outputs, such as the 8.5 GPM Ranein and VancEpic heaters, which suit high-demand households. Other picks offer WiFi control or different venting needs. Each alternative maintains the core function of providing on-demand hot water, but adjusts the size, output, or technology to better match your specific requirements.
Our top pick: Rinnai Outdoor Propane Tankless Water Heater.
How alternatives differ from Rinnai
Ranein 8.5 GPM Outdoor Propane Water Heater
The Ranein model offers a higher rated size of 8.5 GPM compared to the Rinnai RUS65EP’s 6.5 GPM capacity. It is slightly more compact, measuring 15.1 inches wide and deep, versus the Rinnai’s 14.5-inch width and 22-inch length. The Ranein weighs 44 pounds, which is lighter than the Rinnai’s 63 pounds. This makes installation easier for one person. Both units use propane and are designed for outdoor installation. The Ranein provides more potential flow for larger households, while the Rinnai offers a proven track record and specific venting flexibility with PVC or CPVC. Choose the Ranein if you need higher flow and lighter weight.
Rinnai 6.1 GPM Outdoor Propane Water Heater
The Rinnai RE160eP is significantly more compact than the RUS65EP. It measures only 10.8 inches in length, compared to the RUS65EP’s 22 inches. It is also shorter at 24.6 inches high versus 35 inches. The flow rate is rated at 6.6 GPM, which is slightly higher than the RUS65EP’s 6.5 GPM. It weighs 49.2 pounds, lighter than the RUS65EP. This unit is non-condensing and uses propane. It is ideal for tight outdoor spaces where the bulkier RUS65EP would not fit. You get similar brand reliability with a smaller footprint. The trade-off is slightly less overall volume capacity, but the space savings are substantial.
Westinghouse 8.1 GPM Propane Outdoor Heater
The Westinghouse HS180A0G-LP is rated for 8.1 GPM, which is higher than the RUS65EP’s 6.5 GPM. It is wider at 17.1 inches compared to the Rinnai’s 14.5 inches, but shorter at 26.8 inches high. It weighs only 42 pounds, making it the lightest option here. It uses propane and is for outdoor use. This unit focuses on temperature stability and safety certification. If you prioritize consistent heat output and a lighter, wider profile, this is a strong alternative. The RUS65EP is narrower and taller. Choose the Westinghouse if you need higher flow and do not mind a wider installation space.
Rheem RTG 7.0 GPM Propane Outdoor
The Rheem RTG-70XLP-3 includes WiFi connectivity, a feature not listed for the RUS65EP. It is rated at 7.0 GPM, higher than the Rinnai’s 6.5 GPM. It is much more compact, measuring 9.4 inches in length and 20.8 inches high. It weighs 39.3 pounds, significantly lighter than the RUS65EP. Both are outdoor propane units. The Rheem offers precise temperature control through smart features. The RUS65EP focuses on traditional reliability and flexible venting. If you want remote monitoring and a smaller, lighter unit, the Rheem is the better choice. It sacrifices some physical bulk for modern control capabilities.
VancEpic Outdoor Propane Tankless Water Heater
The VancEpic V-RHO19K-LPG is rated at 8.5 GPM, matching the Ranein and exceeding the RUS65EP’s 6.5 GPM. It shares the same dimensions as the Ranein, measuring 15.1 inches wide and deep, and 24.3 inches high. It weighs 49 pounds. It uses propane for outdoor installation. This unit is designed for high flow in low-elevation areas. It lacks the smart features of the Rheem but offers substantial water volume. The RUS65EP is taller and heavier. Choose the VancEpic if you need maximum flow for a large family and do not require WiFi or brand-specific warranty terms. It is a high-output option for standard outdoor setups.
A. O. Smith 6.6 GPM Outdoor Propane Tankless Water Heater
The A.O. Smith ATO-140H is rated at 6.6 GPM, slightly higher than the RUS65EP. It is compact, measuring 13.9 inches wide and deep, and 22.9 inches high. It weighs 52 pounds. It uses propane and is for outdoor installation. This unit is a condensing model, which may offer higher efficiency than the non-condensing RUS65EP. It features a copper heat exchanger for durability. The RUS65EP is taller and wider. Choose the A.O. Smith if you prioritize heat exchanger material quality and condensing efficiency. It provides similar flow with a focus on long-term durability and energy savings. It is a solid choice for those valuing component quality over brand name.
Quick picks
Our 7 picks
Rinnai Outdoor Propane Tankless Water Heater
Best for: Medium homes needing reliable outdoor propane heat
- Fuel Type
- Propane
- Flow Rate
- 6.5 GPM
- Installation Location
- Outdoor
- Dimensions
- 35 x 14.5 x 22 in
- Weight
- 63 pounds
View on Amazon: Rinnai Outdoor Propane Tankless Water Heater Affiliate link
The Rinnai RUS65EP is an outdoor propane tankless water heater with a 6.5 GPM flow rate. It delivers hot water to up to five appliances simultaneously. The unit measures 35 by 14.5 by 22 inches and weighs 63 pounds. It offers flexible venting options and energy-efficient operation. This model suits households needing reliable, continuous hot water without the bulk of a traditional tank.
Pros
- 6.5 GPM flow rate for multiple simultaneous uses
- Compact outdoor design saves space
- Flexible venting options for various installations
- 12-year heat exchanger warranty
Cons
- Lower flow rate than 7.0+ GPM competitors
- Outdoor installation only
- Requires professional installation
Good fit if
- You need hot water for up to five fixtures
- You have outdoor space for installation
- You prefer propane fuel
Skip if
- You require indoor installation
- You need a flow rate above 6.5 GPM
- You want a DIY-friendly setup
Verdict: Rinnai RUS65EP 6.5 GPM Propane Heater provides steady hot water for medium-sized homes. It fits buyers who value brand reliability and flexible venting over maximum flow speed.
Ranein 8.5 GPM Outdoor Propane Water Heater
Best for: outdoor whole-family hot water
- Fuel Type
- Propane Gas
- Flow Rate
- 8.5 GPM
- BTU
- 190,000 BTU
- Installation Location
- Outdoor
- Dimensions
- 24.3"L x 15.1" W x 8.1"H
- Weight
- 44 pounds
View on Amazon: Ranein 8.5 GPM Outdoor Propane Water Heater Affiliate link
The Ranein RHO19K-LPG delivers 190,000 BTU and up to 8.5 GPM for outdoor propane use. Its compact 24.3 x 15.1 x 8.1 inch frame fits tight spaces. The unit includes anti-freeze protection and a bottom-mounted fan for safety. It supports 4-6 outlets, making it suitable for whole-family hot water needs without preheating delays.
Pros
- High 190,000 BTU heating capacity
- Maximum 8.5 GPM flow rate
- Anti-freeze protection included
- Compact 24.3 x 15.1 x 8.1 inch size
- Bottom-mounted fan for safety
Cons
- Not recommended for altitudes over 2,000 feet
- Requires manual draining of pressure relief valve in cold weather
- No remote control or app mentioned in specifications
Good fit if
- You need high flow rate for multiple outlets
- You have an outdoor installation space
- You want anti-freeze protection
Skip if
- You live above 2,000 feet altitude
- You need indoor installation
- You want remote control features
Verdict: Ranein 8.5 GPM Propane Tankless Heater offers strong heating power and safety features for outdoor use. It fits homes needing high flow rates at standard altitudes.
Rinnai 6.1 GPM Outdoor Propane Water Heater
Best for: compact outdoor spaces and warranty peace of mind
- Fuel Type
- Propane
- Flow Rate
- 6.1 GPM
- BTU
- 160k BTU
- Installation Location
- Outdoor
- Dimensions
- 24.6 x 14.1 x 10.8 in
- Venting Type
- Non-Condensing
View on Amazon: Rinnai 6.1 GPM Outdoor Propane Water Heater Affiliate link
The Rinnai RE160eP is a non-condensing outdoor propane tankless water heater designed for reliable performance. It delivers a flow rate of 6.1 GPM, supporting up to five fixtures simultaneously. The unit measures 24.6 x 14.1 x 10.8 inches and weighs 49.2 pounds, fitting into compact outdoor spaces. Its LED screen displays error codes and service reminders. This model suits homeowners seeking a trusted brand with a robust heat exchanger warranty.
Pros
- Provides 6.1 GPM flow rate for multiple simultaneous uses
- Includes a 15-year limited warranty on the heat exchanger
- Compact dimensions of 24.6 x 14.1 x 10.8 inches
- Features an LED screen for error codes and reminders
Cons
- Lower flow rate of 6.1 GPM compared to 8.5 GPM competitors
- WiFi control module is sold separately
- Labor warranty defaults to one year if not registered within 90 days
Good fit if
- You need a trusted brand with a strong heat exchanger warranty
- You have limited outdoor space for installation
- You prefer non-condensing units for outdoor environments
Skip if
- You require a flow rate above 7.0 GPM
- You want built-in WiFi connectivity without extra purchases
- You are looking for the highest possible flow rate
Verdict: Rinnai RE160eP 6.1 GPM Propane is a solid choice for users prioritizing brand reliability and warranty coverage over maximum flow capacity. It fits well in compact outdoor settings where space is limited.
Westinghouse 8.1 GPM Propane Outdoor Heater
Best for: outdoor whole-home hot water with stability
- Fuel Type
- Propane
- Flow Rate
- 8.1 GPM
- BTU
- 180,000 BTU
- Installation Location
- Outdoor
- Voltage
- 120 V AC
- Temperature Control
- ±1°F
View on Amazon: Westinghouse 8.1 GPM Propane Outdoor Heater Affiliate link
This outdoor propane unit delivers 8.1 GPM and 180,000 BTU for whole-home use. It maintains temperature within ±1°F using self-modulating technology. The compact 26.8 x 17.1 x 17.1 inch design saves space. It includes a wired digital controller and freeze protection. This model suits you if you need reliable outdoor performance with precise heat control for multiple fixtures.
Pros
- 8.1 GPM flow rate supports 3–5 fixtures
- 180,000 BTU output for high demand
- ±1°F temperature stability prevents fluctuations
- Wired digital controller for remote adjustment
- CSA-certified for outdoor safety
Cons
- 2-year limited warranty is shorter than competitors
- Requires 120V AC power for operation
- Heavier at 42 pounds than lighter alternatives
Good fit if
- You need precise temperature control for outdoor showers
- You want a CSA-certified unit for safety
- You require support for multiple simultaneous fixtures
Skip if
- You prefer a longer warranty period
- You need indoor installation options
- You want wireless app control
Verdict: Westinghouse 8.1 GPM Propane Outdoor Heater offers precise temperature stability and strong output for outdoor setups. It fits buyers who prioritize consistent heat and safety certification over extended warranty terms.
Rheem RTG 7.0 GPM Propane Outdoor
Best for: Precise temperature control and WiFi
- Fuel Type
- Liquid Propane
- Flow Rate
- 7.0 GPM
- BTU
- 160,000 BTU/hr
- Installation Location
- Outdoor
- Temperature Control
- ±1°F
- Certification
- CSA
View on Amazon: Rheem RTG 7.0 GPM Propane Outdoor Affiliate link
The Rheem RTG Series delivers 7.0 GPM at 160,000 BTUs for whole-house use. It features WiFi connectivity and precise ±1°F digital temperature control. This non-condensing unit is designed for outdoor installation and includes built-in freeze protection. You get endless hot water for 2-3 simultaneous showers. The compact metal cabinet fits tight spaces.
Pros
- WiFi connectivity for remote monitoring
- Precise ±1°F digital temperature control
- 7.0 GPM flow rate for whole-house use
- Built-in freeze protection
- Outdoor-ready non-condensing design
Cons
- Lower flow rate than competitors offering 8.1-8.5 GPM
- Requires professional installation
- No remote control included
Good fit if
- You want precise temperature adjustments
- You need WiFi connectivity
- You install outdoors
Skip if
- You need more than 7.0 GPM
- You prefer indoor installation
- You want a higher BTU output
Verdict: Rheem RTG 7.0 GPM WiFi Propane offers precise control and WiFi connectivity for users who prioritize temperature stability over maximum flow rate.
VancEpic Outdoor Propane Tankless Water Heater
Best for: High flow outdoor use in low elevations
- Fuel Type
- Propane
- Flow Rate
- 8.5 GPM
- BTU
- 190,000 BTU
- Installation Location
- Outdoor
- Dimensions
- 24.3 x 15.1 x 8.1 inches
- Weight
- 49 pounds
View on Amazon: VancEpic Outdoor Propane Tankless Water Heater Affiliate link
The VancEpic model delivers 8.5 GPM at 190,000 BTU for outdoor propane use. Its compact 24.3 x 15.1 x 8.1 inch frame fits tight spaces. The internal fan adjusts to wind and temperature changes for stable combustion. It supports 4-6 outlets and includes anti-freeze protection. You get instant hot water without waiting for a tank to preheat. This unit suits families needing high flow rates in mild climates.
Pros
- 8.5 GPM flow rate supports multiple simultaneous outlets
- 190,000 BTU heating capacity for rapid heating
- Anti-freeze protection prevents internal cracking
- Compact dimensions save outdoor space
- Internal fan adjusts to wind pressure for safety
Cons
- Not recommended for elevations over 2,000 feet
- Requires manual draining of pressure relief valve in cold weather
- No remote control or smart app mentioned
Good fit if
- You need high flow for 4-6 outlets
- You install the unit outdoors in low elevation areas
- You want compact dimensions for tight spaces
Skip if
- You live above 2,000 feet elevation
- You need indoor installation
- You want smart app connectivity
Verdict: VancEpic 8.5 GPM Propane Outdoor Heater is a high-output option for families in low-elevation areas. It fits best where you need strong flow and do not require smart features or indoor mounting.
A. O. Smith 6.6 GPM Outdoor Propane Tankless Water Heater
Best for: Efficient condensing propane heating
- Fuel Type
- Propane
- Flow Rate
- Up to 6.6 GPM
- BTU
- 120,000 BTU
- Installation Location
- Outdoor
- Venting Type
- Condensing
- Dimensions
- 13.9 × 13.9 × 22.9 inches
View on Amazon: A. O. Smith 6.6 GPM Outdoor Propane Tankless Water Heater Affiliate link
The A.O. Smith ATO-140H delivers 6.6 GPM at 120,000 BTU. This condensing outdoor unit uses a copper primary heat exchanger for faster temperature stabilization. It includes a 316L stainless steel secondary exchanger for corrosion resistance. The compact design vents with standard PVC pipe. It suits households needing reliable hot water with efficient heat transfer technology.
Pros
- 6.6 GPM continuous flow rate
- 120,000 BTU heating capacity
- Copper primary heat exchanger for superior heat transfer
- Condensing design for efficiency
- Vents with 3-inch or 4-inch PVC
Cons
- Lower flow rate than 8.5 GPM competitors
- Heavier at 52 pounds
- Condensing unit requires specific venting
Good fit if
- You need efficient heat transfer from a copper exchanger
- You prefer condensing technology for propane
- You have standard PVC venting available
Skip if
- You require more than 6.6 GPM
- You need a non-condensing unit
- You want a lighter installation
Verdict: A.O. Smith ATO-140H 6.6 GPM Propane fits users prioritizing heat exchanger material quality over maximum flow volume. It is a solid choice for those who value condensing efficiency and copper durability.
Specifications side by side
| Spec | Rinnai Outdoor Propane Tankless Water Heater | Ranein 8.5 GPM Outdoor Propane Water Heater | Rinnai 6.1 GPM Outdoor Propane Water Heater | Westinghouse 8.1 GPM Propane Outdoor Heater | Rheem RTG 7.0 GPM Propane Outdoor | VancEpic Outdoor Propane Tankless Water Heater | A. O. Smith 6.6 GPM Outdoor Propane Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Propane | Propane Gas | Propane | Propane | Liquid Propane | Propane | Propane |
| Flow Rate | 6.5 GPM | 8.5 GPM | 6.1 GPM | 8.1 GPM | 7.0 GPM | 8.5 GPM | Up to 6.6 GPM |
| BTU | not stated | 190,000 BTU | 160k BTU | 180,000 BTU | 160,000 BTU/hr | 190,000 BTU | 120,000 BTU |
| Installation Location | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor | Outdoor |
| Voltage | not stated | not stated | not stated | 120 V AC | not stated | not stated | not stated |
| Temperature Control | not stated | not stated | not stated | ±1°F | ±1°F | not stated | not stated |
| Certification | not stated | not stated | not stated | CSA | CSA | not stated | not stated |
| Dimensions | 35 x 14.5 x 22 in | 24.3"L x 15.1" W x 8.1"H | 24.6 x 14.1 x 10.8 in | 26.8 x 17.1 x 17.1 in | 20.8 x 13.5 x 9.4 inches | 24.3 x 15.1 x 8.1 inches | not stated |
| Use | not stated | not stated | not stated | Whole House | not stated | not stated | not stated |
| Venting Type | not stated | not stated | Non-Condensing | not stated | Non-Condensing | not stated | Condensing |
| Features | not stated | not stated | not stated | not stated | WiFi | not stated | not stated |
| Weight | 63 pounds | 44 pounds | 49.2 pounds | 42 pounds | 39.3 pounds | 49 pounds | 52 pounds |
| Size | 6.5 GPM | 8.5 GPM Outdoor | 6.6 GPM | not stated | 7.0 GPM (Non-WiFi) | 8.5 GPM,190,000 BTU, Outdoor | not stated |
| Color | Outdoor Installation | Gray-LPG | Silver | Grey 81LPO | Gray | Gray-LPG | White |
| Model | RUS65EP | RHO19K-LPG | REU-VE2125WD-US-P | HS180A0G-LP | RTG-70XLP-3 | V-RHO19K-LPG | ATO-140H 101 |
For a related comparison, read apec water apec tankless ro water alternatives.
Frequently asked questions
Which alternative offers the highest flow rate for outdoor use?
The Ranein and VancEpic models both list a size of 8.5 GPM. This exceeds the Rinnai RUS65EP’s 6.5 GPM capacity. These units are designed for outdoor propane installation. They provide strong heating power for whole-family hot water needs. This higher output suits homes requiring maximum flow speed at standard altitudes.
Is there a tankless heater with WiFi connectivity?
Yes, the Rheem RTG 7.0 GPM model includes WiFi features. This allows for precise temperature control from a distance. It is a non-condensing propane unit designed for outdoor mounting. This option fits buyers who prioritize smart connectivity and stability over maximum flow volume.
Which option is the most compact for small spaces?
The Rheem RTG model measures 13.5 inches wide and 9.4 inches long. It is the narrowest unit on this list. The A.O. Smith model is also slim at 13.9 inches wide. These compact dimensions help fit tight outdoor areas where space is limited for installation.
Does any alternative use condensing technology for efficiency?
The A.O. Smith ATO-140H is described as an efficient condensing propane heater. It features a copper heat exchanger for durability. This model offers 6.6 GPM flow. It suits users who value condensing efficiency and material quality over higher flow volumes.
Which unit is the lightest to install?
The Rheem RTG 7.0 GPM weighs 39.3 pounds. It is the lightest unit listed. The Westinghouse model follows closely at 42 pounds. Lighter weight simplifies mounting and handling during outdoor installation. This is useful for DIY setups or single-person installations.
Are there non-condensing options available?
Yes, the Rheem RTG and Rinnai RE160eP are non-condensing units. Non-condensing models are often simpler to vent. They are suitable for various outdoor climates. These options fit buyers who prefer traditional venting methods or specific installation constraints.
Which brand provides a premium choice?
The Rinnai RE160eP is labeled as the best premium option. It offers 6.6 GPM flow in a silver finish. This model prioritizes brand reliability and warranty coverage. It fits users who want established support rather than maximum flow capacity or smart features.