Rinnai RE160eP Non-Condensing Propane Tankless Water Heater vs Rinnai REP199eN Smart-Circ Natural Gas Tankless Water Heater: Spec Comparison
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The Rinnai RE160eP non condensing propane tankless water heater vs Rinnai REP199eN Smart-Circ Natural Gas Tankless Water Heater comparison highlights key differences in fuel and flow. Both units are compact, outdoor-rated, non-condensing models with identical dimensions. They share the same residential warranty structure and require professional installation. The main distinction lies in the fuel source and the integrated recirculation technology found in the natural gas model. This affects your hot water capacity and energy management strategy.
Key differences
| Aspect | Rinnai 6.1 GPM Outdoor Propane Water Heater | Rinnai Smart-Circ Outdoor Natural Gas Water Heater |
|---|---|---|
| Fuel Type | Propane | Natural Gas |
| Flow Rate | 6.1 GPM | 7.6 GPM |
| Recirculation | Not listed | Smart-Circ with built-in pump |
Which one should you choose?
Choose Rinnai 6.1 GPM Outdoor Propane Water Heater if
- You have a propane supply line available for outdoor installation
- You need a unit that fits a standard outdoor footprint without recirculation plumbing
- You prefer a simpler mechanical setup without intelligent pump scheduling
Choose Rinnai Smart-Circ Outdoor Natural Gas Water Heater if
- You have a natural gas connection and want higher simultaneous fixture capacity
- You want instant hot water at multiple taps without waiting for the pipe to clear
- You prefer energy efficiency through learned usage patterns and scheduled recirculation
Verdict: Choose the RE160eP if you are already set up for propane and do not need recirculation. The REP199eN is the better choice if you have natural gas and want higher flow rates with smart recirculation features. Both units offer the same compact size and durable outdoor construction.
Fuel and Flow Rate Comparison
Fuel Type
You must match the fuel source to your home’s existing infrastructure. The Rinnai RE160eP is designed strictly for propane. This unit requires a propane tank connection and specific gas line sizing. In contrast, the Rinnai REP199eN operates on natural gas. It connects directly to a natural gas supply line. If you already have a propane tank, the RE160eP is your only option here. If you are connected to a municipal or private natural gas grid, the REP199eN is the correct choice. Using the wrong fuel type will prevent the unit from functioning. You need to verify your fuel source before purchasing either model.
Flow Rate Capacity
Flow rate determines how many fixtures can run simultaneously. The Rinnai RE160eP delivers a maximum of 6.1 to 6.6 gallons per minute. This capacity supports up to five fixtures at once. The Rinnai REP199eN offers a higher output of 7.6 to 7.9 gallons per minute. This allows for six fixtures running concurrently. If you have a larger household or high-demand appliances like a large soaking tub, the REP199eN provides more water volume. The RE160eP is sufficient for moderate use. The higher flow rate of the REP199eN gives it an advantage for busy homes.
Recirculation Features
Hot water convenience varies between these two models. The Rinnai REP199eN includes Smart-Circ technology with a built-in recirculation pump. This system learns your usage patterns and schedules recirculation automatically. It reduces wait times for hot water without wasting energy. The Rinnai RE160eP does not list a built-in recirculation pump or Smart-Circ technology in its specifications. You would need to manage recirculation separately if you choose the RE160eP. The integrated pump in the REP199eN adds convenience and efficiency. This feature is a significant practical advantage for daily comfort.
Physical Dimensions
Space planning is identical for both units. Both the Rinnai RE160eP and the Rinnai REP199eN share the exact same physical footprint. Each unit measures 24.6 inches in height, 14.1 inches in width, and 10.8 inches in length. They are both described as compact, outdoor-rated units. This consistency means your existing installation space will fit either model without modification. You do not need to adjust clearance requirements or mounting brackets based on size. The physical dimensions are a tie, offering equal flexibility for placement.
Venting Type
Both units utilize non-condensing venting technology. The Rinnai RE160eP is a non-condensing propane heater. The Rinnai REP199eN is a non-condensing natural gas heater. Non-condensing units exhaust hot gases directly, requiring specific venting materials and clearances. Neither model lists condensing technology, which would allow for different venting options like PVC. You must follow standard non-condensing venting guidelines for both. The venting requirements are functionally equivalent. This aspect does not differentiate the two products in terms of installation complexity.
Which unit fits your hot water needs
Propane users with lower flow needs
Choose this model if your home runs on propane. It delivers 6.1 gallons per minute, which supports five simultaneous fixtures. The compact outdoor design fits standard spaces. You get a 15-year heat exchanger warranty and a 5-year parts guarantee. This unit suits households with moderate hot water demand.
Natural gas users needing high flow
Select this unit if you have natural gas. It provides 7.6 gallons per minute for six fixtures. The built-in Smart-Circ recirculation pump learns your usage patterns. This feature reduces wait times while saving energy. The outdoor non-condensing design ensures durability. You receive the same 15-year heat exchanger warranty as the propane version.
Buyers wanting smart recirculation features
Pick this natural gas model for its intelligent recirculation technology. The integrated pump schedules operation based on your habits. You get instant hot water without wasting energy. The 7.6 GPM flow rate handles heavy usage. The outdoor fit and 15-year warranty make it a practical choice for modern homes with natural gas lines.
The products compared
Rinnai 6.1 GPM Outdoor Propane Water Heater
Best for: outdoor propane homes needing high flow
- 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 propane tankless water heater designed for outdoor installation. It delivers a flow rate of 6.6 GPM, allowing up to six fixtures to run simultaneously. The compact unit measures 24.6 by 14.1 by 10.8 inches and weighs 49.2 pounds. It features an LED screen for error codes and service reminders. This model suits homes using propane fuel in regions with moderate groundwater temperatures.
Pros
- 6.6 GPM flow rate supports multiple fixtures
- Compact outdoor design fits small spaces
- LED screen displays service reminders and error codes
- 15-year limited warranty on the heat exchanger
Cons
- Limited to propane fuel type only
- Requires professional installation for optimal performance
- WiFi control module is not included
Good fit if
- You have a propane gas supply available
- You need a compact outdoor water heater
- You want a unit with a high flow rate for multiple fixtures
Skip if
- You require natural gas compatibility
- You need indoor installation options
- You want built-in WiFi control without extra purchases
Verdict: Rinnai RE160eP Propane Outdoor Unit provides reliable hot water for outdoor propane setups. It fits buyers who need high flow rates and compact sizing for exterior mounting.
Rinnai Smart-Circ Outdoor Natural Gas Water Heater
Best for: outdoor multi-fixture natural gas homes
- 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
The Rinnai REP199eN is a non-condensing outdoor tankless water heater designed for natural gas. It delivers up to 7.6 GPM, supporting six simultaneous fixtures. Its compact size fits small spaces. A built-in Smart-Circ pump learns your usage patterns to schedule recirculation, saving energy. This model suits homes needing reliable hot water with smart efficiency features in an outdoor setting.
Pros
- 7.6 GPM flow rate for multiple fixtures
- Built-in Smart-Circ recirculation pump
- Compact outdoor design
- Learns usage patterns for efficiency
Cons
- WiFi control module sold separately
- Outdoor installation only
- Labor warranty defaults to 1-year if not registered in 90 days
Good fit if
- You need hot water for up to six fixtures
- You want energy savings from smart recirculation
- You have outdoor space for installation
Skip if
- You need indoor installation
- You want built-in WiFi without extra purchase
- You require a longer standard labor warranty
Verdict: Rinnai REP199eN Natural Gas Outdoor Heater offers strong flow and smart efficiency for outdoor setups, making it ideal for households with multiple simultaneous hot water needs.
Specifications side by side
| Spec | Rinnai 6.1 GPM Outdoor Propane Water Heater | Rinnai Smart-Circ Outdoor Natural Gas Water Heater |
|---|---|---|
| Fuel Type | Propane | Natural Gas |
| Flow Rate | 6.1 GPM | 7.9 GPM |
| BTU | 160k BTU | 199k BTU |
| Installation Location | Outdoor | Outdoor |
| Dimensions | 24.6 x 14.1 x 10.8 in | 24.6 x 14.1 x 10.8 inches |
| Venting Type | Non-Condensing | not stated |
| Weight | 49.2 pounds | not stated |
| Size | 6.6 GPM | 7.9 GPM |
| Color | Silver | Silver |
| Model | REU-VE2125WD-US-P | REU-VEP2737WD-US-N |
Frequently asked questions
Can I use the Rinnai RE160eP with natural gas?
No, the RE160eP is designed strictly for propane fuel. You must connect it to a propane tank system. The REP199eN model is the correct choice if your home uses natural gas. Using the wrong fuel type will prevent the unit from operating safely or effectively.
What is the difference in flow rate between these two units?
The Rinnai REP199eN provides a higher flow rate of 7.9 GPM compared to the RE160eP’s 6.6 GPM. This means the natural gas model can supply more hot water simultaneously. The propane unit is suitable for lower flow demands, while the gas unit handles higher usage better.
Are the dimensions of both water heaters the same?
Yes, both units share identical physical dimensions. They both measure 14.1 inches in width, 24.6 inches in height, and 10.8 inches in length. This allows for a direct swap in existing outdoor mounting spaces without needing to modify the installation footprint or clearances.
Do these heaters require indoor installation?
No, both the RE160eP and REP199eN are rated for outdoor installation. They are built to withstand exterior environmental conditions. You can mount them on an exterior wall. This keeps indoor space free and utilizes their compact design for efficient outdoor placement.
Which model is better for a home with multiple bathrooms?
The Rinnai REP199eN is better for homes with multiple bathrooms due to its higher 7.9 GPM flow rate. It can support more simultaneous fixtures than the RE160eP. If your household has high concurrent hot water demand, the natural gas model provides the necessary volume.
What venting type do these tankless heaters use?
Both units use non-condensing venting technology. This design is standard for outdoor propane and natural gas installations. It simplifies the venting requirements compared to condensing models. You will need to follow standard non-condensing venting guidelines for safe exhaust removal during operation.