For those seeking a tankless water heater with a recirculation pump, the key considerations are efficiency, installation complexity, and overall system control. The Rinnai REP199eN stands out as the best overall choice, thanks to its smart recirculation features and reliable performance. The Westinghouse Gas Indoor Model offers excellent WiFi connectivity for tech-savvy households, while the Rheem IKONIC 11.2 GPM provides high flow rates suited for larger homes. However, buyers face tradeoffs between upfront cost, energy savings, and installation requirements. Continue reading for a detailed comparison to find the best fit for your needs.
Key Takeaways
- High flow rate models like Rheem IKONIC excel in larger households with multiple bathrooms.
- Smart recirculation features significantly improve convenience and reduce waiting times for hot water.
- Gas-powered units generally offer better performance for bigger demand but tend to be more expensive and complex to install.
- WiFi-enabled models provide remote control and monitoring, ideal for tech enthusiasts who prioritize control.
- Installation complexity varies widely; professional setup is often necessary for gas units with recirculation pumps.
| Rinnai REP199eN Smart-Circ Natural Gas Tankless Water Heater |  | Best Overall for Outdoor Efficiency and Smart Recirculation | Flow Rate: 7.6 GPM | Type: Tankless, Natural Gas, Outdoor | Technology: Smart-Circ intelligent recirculation | VIEW ON AMAZON | See Our Full Breakdown |
| Rinnai REP160iN Smart-Circ Natural Gas Tankless Water Heater |  | Best Indoor Compact Model with Smart Recirculation | Flow Rate: 6.1 GPM | Type: Tankless Natural Gas, Indoor | Technology: Smart-Circ | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse Tankless Water Heater Gas Indoor on Demand, Smart WiFi |  | Best for Large Homes with High Hot Water Demands | Flow Rate: 9.2 GPM | Maximum Temperature: 167 °F | Heat Output: 199,000 BTU | VIEW ON AMAZON | See Our Full Breakdown |
| MIZUDO Natural Gas Tankless Water Heater, 199,000 BTU, Indoor |  | Best for High Capacity and Precise Temperature Control | Flow Rate: 10.3 GPM | BTU: 199,000 | Maximum Temperature: 149°F | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem IKONIC 11.2 GPM Natural Gas Tankless Water Heater Indoor |  | Best for Whole-House Capacity with Smart Recirculation | VIEW ON AMAZON | See Our Full Breakdown | |||
| Rinnai RXP160iN Condensing Smart Sense Tankless Water Heater |  | Best Overall for Versatile, Energy-Efficient Recirculation | Flow Rate: Up to 9 GPM | Fuel Type: Propane or Natural Gas | Efficiency: UEF .97 | VIEW ON AMAZON | See Our Full Breakdown |
| Rinnai RU160iN Condensing Tankless Hot Water Heater, 9 GPM, Natural Gas, Indoor |  | Best Value for Reliable Whole-Home Hot Water | Flow Rate: 9 GPM | Fuel Type: Natural Gas | Efficiency: ENERGY STAR qualified | VIEW ON AMAZON | See Our Full Breakdown |
| Rinnai REP199eP Smart-Circ Propane Tankless Water Heater |  | Best Compact Outdoor for Space-Saving Recirculation | Flow Rate: 7.6 GPM | Type: Tankless Propane | Warranty: 15-year heat exchanger, 5-year parts, 5-year labor | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem Prestige Condensing Tankless Gas Indoor Water Heater, 11.0 GPM, RTGH-RH11DVLN |  | Best for High-Flow, Multi-Bath Homes with Advanced Safety | Flow Rate: 11 GPM | Heat Output: 199,000 BTU | Maximum Pressure: 150 psi | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem IKONIC 11.2 GPM Liquid Propane Tankless Water Heater Indoor | | Best Premium for Large-Scale, Remote Control Hot Water | Flow Rate: 11.2 GPM | Fuel Type: Liquid Propane | BTUs: 199,900 | VIEW ON AMAZON | See Our Full Breakdown |
| tankless water heater with recirculation pump | Flow Rate | Warranty |
|---|---|---|
| Rinnai REP199eN Smart-Circ Nat | 7.6 GPM | 15-year on heat exchanger, 5-year on parts and labor |
| Rinnai REP160iN Smart-Circ Nat | 6.1 GPM | 15-year on heat exchanger, 5-year on parts, 5-year on labor |
| Westinghouse Tankless Water He | 9.2 GPM | — |
| MIZUDO Natural Gas Tankless Wa | 10.3 GPM | — |
| Rheem IKONIC 11.2 GPM Natural | — | — |
| Rinnai RXP160iN Condensing Sma | Up to 9 GPM | 15-year on heat exchanger, 5-year on parts and labor |
| Rinnai RU160iN Condensing Tank | 9 GPM | 15-year heat exchanger, 5-year labor, 1-year parts |
| Rinnai REP199eP Smart-Circ Pro | 7.6 GPM | 15-year heat exchanger, 5-year parts, 5-year labor |
| Rheem Prestige Condensing Tank | 11 GPM | 12-year heat exchanger, 5-year parts, 1-year labor |
| Rheem IKONIC 11.2 GPM Liquid P | 11.2 GPM | 15 years |
More Details on Our Top Picks
Rinnai REP199eN Smart-Circ Natural Gas Tankless Water Heater
The Rinnai REP199eN excels in outdoor applications, combining durable construction with advanced Smart-Circ technology that learns your water usage to optimize recirculation. Compared with indoor models like the REP160iN, it offers a higher flow rate (7.6 GPM vs. 6.1 GPM), making it better suited for homes with multiple outdoor fixtures. However, the WiFi control requires an additional purchase, and professional installation is recommended—adding to overall cost. Its compact size and 15-year warranty on the heat exchanger make it a reliable, space-saving choice for those who want outdoor efficiency with smart features.
Pros:- Energy-efficient smart recirculation that adapts to usage
- Compact and space-saving outdoor design
- High flow rate supports multiple fixtures
- Long warranty for peace of mind
Cons:- WiFi control requires an extra purchase
- Professional installation recommended adds to cost
Best for: Homeowners seeking durable, outdoor hot water with smart recirculation and high flow capacity
Not ideal for: Small indoor spaces or homes primarily using gas in a different setting, due to outdoor installation needs and higher initial costs
- Flow Rate:7.6 GPM
- Type:Tankless, Natural Gas, Outdoor
- Technology:Smart-Circ intelligent recirculation
- Warranty:15-year on heat exchanger, 5-year on parts and labor
- Size:Size of a small suitcase
Our verdict“This model is best for outdoor spaces where durability and smart efficiency are priorities, and professional setup is acceptable.”
Rinnai REP160iN Smart-Circ Natural Gas Tankless Water Heater
The Rinnai REP160iN stands out for its compact size and advanced Smart-Circ technology, which learns your water patterns to reduce energy waste. Compared to the outdoor REP199eN, it offers a slightly lower flow rate (6.1 GPM), but its indoor installation makes it ideal for tight spaces. Like the outdoor model, WiFi control is available but sold separately, and installation requires professional setup. It supports multiple fixtures, making it a solid choice for urban or space-constrained homes where efficiency and convenience matter most.
Pros:- Space-saving compact design
- Smart learning for energy savings
- Supports multiple fixtures simultaneously
- Long-term warranty coverage
Cons:- WiFi control sold separately
- Requires professional installation
Best for: Urban dwellers or homeowners needing an indoor, space-efficient unit with smart features
Not ideal for: Homes with high hot water demand or those without access to natural gas, due to capacity limits and fuel type
- Flow Rate:6.1 GPM
- Type:Tankless Natural Gas, Indoor
- Technology:Smart-Circ
- Warranty:15-year on heat exchanger, 5-year on parts, 5-year on labor
- Size:Approximately the size of a small suitcase
Our verdict“Ideal for small indoor spaces where smart recirculation increases efficiency without sacrificing capacity.”
Westinghouse Tankless Water Heater Gas Indoor on Demand, Smart WiFi
The Westinghouse Gas Indoor Tankless Water Heater offers a robust 9.2 GPM flow rate and 199,000 BTU output, making it suitable for large households with 4+ bathrooms. It includes smart WiFi and voice control, comparable to the Rheem IKONIC but with a slightly higher BTU rating for winter performance. While it provides excellent capacity, it requires proper venting and has a higher initial cost, which might deter smaller households or those with installation constraints. Its energy efficiency and remote operation make it a strong contender for big homes seeking reliable hot water.
Pros:- High flow rate supports multiple bathrooms
- Smart WiFi and voice control for convenience
- Stable temperature with advanced technology
- Reliable winter performance with freeze protection
Cons:- Requires proper venting setup
- Higher initial installation cost
Best for: Large households needing high hot water flow with remote control features
Not ideal for: Small homes or apartments with limited space or venting options, due to size and venting requirements
- Flow Rate:9.2 GPM
- Maximum Temperature:167 °F
- Heat Output:199,000 BTU
- Power Source:gas powered
- Wattage:44 watts
- Dimensions:15.9″W x 24.8″H
Our verdict“Best suited for large homes where capacity and remote control are essential, and venting logistics are manageable.”
MIZUDO Natural Gas Tankless Water Heater, 199,000 BTU, Indoor
The MIZUDO 10.3 GPM model offers impressive hot water capacity with 199,000 BTU, supporting multiple fixtures simultaneously. Its precise temperature control within ±1°F and smart WiFi connectivity compatible with Alexa make it a flexible and energy-efficient choice. Compared to the Rheem IKONIC, it provides a higher flow rate, ideal for busy households, but its installation requires professional setup, and limited details on durability could be a concern over time. This model makes sense for those prioritizing high demand and smart home integration.
Pros:- Supports multiple fixtures with high flow rate
- Precise temperature control within ±1°F
- Smart WiFi compatible with Alexa
- Supports busy households’ hot water needs
Cons:- Requires professional installation
- Limited info on material durability
Best for: Households requiring high flow capacity with smart temperature control and voice connectivity
Not ideal for: Residences at high elevations above 3,000 feet or those seeking a more established brand with extensive warranty info
- Flow Rate:10.3 GPM
- BTU:199,000
- Maximum Temperature:149°F
- Power Source:Natural Gas
- Voltage:120 volts
Our verdict“Best for large households demanding high flow, precise control, and smart home compatibility, with installation support required.”
Rheem IKONIC 11.2 GPM Natural Gas Tankless Water Heater Indoor
The Rheem IKONIC offers the highest flow rate in this lineup at 11.2 GPM, making it ideal for large homes or busy households. It features built-in recirculation, which minimizes wait times and saves energy, similar to the Westinghouse but with a more streamlined setup. Its compact size allows flexible installation, yet it requires a natural gas connection and proper venting, adding complexity and cost. While its high capacity suits large families, the potentially higher upfront investment and setup complexity may deter smaller households or those seeking simpler solutions.
Pros:- High flow rate supports entire household
- Built-in recirculation reduces wait time
- Smart Wi-Fi enables remote monitoring
- Compact size for flexible installation
Cons:- Requires proper venting and natural gas connection
- Higher upfront cost and complexity
Best for: Large homes or busy families needing maximum hot water capacity with integrated recirculation
Not ideal for: Small apartments or homes with limited venting options, due to size and installation complexity
Our verdict“Ideal for large, demanding households that want the convenience of built-in recirculation and remote control, with professional installation required.”
Rinnai RXP160iN Condensing Smart Sense Tankless Water Heater
The Rinnai RXP160iN stands out for its combination of space-saving design and smart recirculation technology, which adapts to household usage patterns for maximum efficiency. Unlike the Rinnai RU160iN, which is primarily designed for indoor use, this model offers the flexibility of indoor or outdoor installation, making it more versatile. While its Wi-Fi control requires an extra purchase, the smart learning feature reduces energy waste and wait times. The compact size makes it ideal for homes with limited space, but outdoor installation needs a vent cap, adding another step. Compared to less sophisticated models, the Rinnai RXP160iN offers a higher efficiency rating (.97 UEF) and broader placement options, though it requires professional installation. This pick makes the most sense for homeowners seeking a flexible, space-efficient, and energy-conscious solution with advanced recirculation features.
Pros:- Compact size saves valuable space
- High energy efficiency with UEF .97
- Smart recirculation learns usage for convenience
- Flexible indoor or outdoor installation
Cons:- Wi-Fi control requires additional module purchase
- Professional installation recommended
- Vent cap needed for outdoor setup
Best for: Homeowners needing a space-saving, flexible installation that maximizes energy efficiency and convenience.
Not ideal for: Those seeking a simple, budget-friendly unit without smart features or outdoor installation capability.
- Flow Rate:Up to 9 GPM
- Fuel Type:Propane or Natural Gas
- Efficiency:UEF .97
- Installation Options:Indoor or outdoor with Versa Vent
- Warranty:15-year on heat exchanger, 5-year on parts and labor
- Wi-Fi Connectivity:Optional with Control-R module (sold separately)
Our verdict“This model is perfect for homeowners wanting a smart, space-efficient heater that adapts to their usage patterns and installation needs.”
Rinnai RU160iN Condensing Tankless Hot Water Heater, 9 GPM, Natural Gas, Indoor
The Rinnai RU160iN offers a strong balance between performance and cost, providing up to 9 GPM of hot water suitable for whole-home use. Its advanced Circ-Logic technology ensures fast hot water delivery with minimal waste, surpassing standard models that lack recirculation. While it shares features with the Rinnai RXP160iN, it is primarily designed for indoor installation and emphasizes energy efficiency with ENERGY STAR qualification. The unit’s extensive warranties and durable construction promise long-term reliability, but the need for professional installation and extra Wi-Fi modules might increase overall costs. Compared to outdoor or more compact units, this model is better suited for homes that prioritize continuous hot water with minimal space constraints. Overall, it’s an excellent choice for those seeking dependable performance and smart recirculation within a fixed indoor setup.
Pros:- Unlimited hot water for multiple fixtures
- Space-saving, energy-efficient design
- Advanced recirculation reduces wait time
- Long warranties and durable construction
Cons:- Requires professional installation, adding cost
- Wi-Fi monitoring needs extra modules
- Higher initial investment compared to traditional units
Best for: Families looking for a reliable, energy-efficient indoor heater capable of serving multiple bathrooms simultaneously.
Not ideal for: Homeowners needing outdoor installation or on a tight budget due to higher upfront costs and installation needs.
- Flow Rate:9 GPM
- Fuel Type:Natural Gas
- Efficiency:ENERGY STAR qualified
- Installation:Indoor
- Warranty:15-year heat exchanger, 5-year labor, 1-year parts
- Technology:SENSEI, Circ-Logic
- Wi-Fi Monitoring:Available with Controlr module (not included)
Our verdict“This model fits well for large households that need reliable, energy-efficient hot water with smart features, despite higher upfront costs.”
Rinnai REP199eP Smart-Circ Propane Tankless Water Heater
The Rinnai REP199eP excels in outdoor, space-constrained settings thanks to its compact, suitcase-sized design. Its Smart-Circ technology learns your water usage patterns, optimizing recirculation for efficiency and reduced wait times, making it a strong choice over manual recirculation models. However, its outdoor-only placement limits flexibility, especially for homes needing indoor units. While Wi-Fi control is available, it’s an optional add-on, and outdoor installation requires additional venting considerations. Compared to larger indoor units like the Rheem Prestige, it offers similar smart features but sacrifices some capacity and convenience for space savings. This makes it ideal for outdoor areas where space is at a premium, but less suitable for indoor applications or cold climates without proper protection.
Pros:- Extremely compact, space-saving design
- Smart recirculation learns usage patterns
- Durable construction with extended warranties
- Provides hot water for multiple fixtures simultaneously
Cons:- Limited to outdoor use
- Wi-Fi control requires extra purchase
- Venting and weather protection needed for outdoor setup
Best for: Homeowners needing a space-efficient, outdoor hot water solution in mild climates or with limited indoor space.
Not ideal for: Homes requiring indoor installation or those in colder climates that need indoor units for better insulation and protection.
- Flow Rate:7.6 GPM
- Type:Tankless Propane
- Warranty:15-year heat exchanger, 5-year parts, 5-year labor
- Size:Small suitcase-sized
- Recirculation Technology:Smart-Circ
- Connectivity:WiFi control (not included)
Our verdict“This outdoor, compact heater is perfect for space-constrained outdoor spots but unsuitable for indoor or cold-weather use.”
Rheem Prestige Condensing Tankless Gas Indoor Water Heater, 11.0 GPM, RTGH-RH11DVLN
The Rheem Prestige RTGH-RH11DVLN offers a significant flow rate of 11 GPM, making it ideal for larger households with multiple bathrooms. Its built-in recirculation pump and smart controls deliver instant hot water, improving comfort and reducing waste. Compared with smaller units, it handles higher demand efficiently, but the larger size and higher power requirements mean it needs proper venting and more space. Its advanced safety features, like leak detection and low NOx emissions, provide peace of mind. Despite requiring professional installation and a higher initial investment, this model’s performance and reliability make it a strong choice for busy homes. It’s less suited for smaller households or those seeking a budget-friendly solution, due to its capacity and complexity.
Pros:- High flow rate of 11 GPM for multiple fixtures
- Built-in recirculation for instant hot water
- Enhanced safety features including leak detection
- Suitable for larger homes with higher demand
Cons:- Requires professional installation and venting
- Higher upfront cost and complexity
- Larger footprint may limit placement options
Best for: Large households with multiple bathrooms needing high flow and reliable, instant hot water with safety features.
Not ideal for: Small homes or apartments with limited space and lower hot water demands, due to its size and cost.
- Flow Rate:11 GPM
- Heat Output:199,000 BTU
- Maximum Pressure:150 psi
- Capacity:11 gallons
- Style:Indoor
- Material Type:Stainless Steel
- Warranty:12-year heat exchanger, 5-year parts, 1-year labor
Our verdict“This unit suits big households that need high capacity, fast hot water, and safety, despite its installation complexity and cost.”
Rheem IKONIC 11.2 GPM Liquid Propane Tankless Water Heater Indoor
The Rheem IKONIC 11.2 GPM delivers exceptional flow for large homes, with built-in recirculation and Wi-Fi connectivity for remote control and monitoring. Its dual heat exchanger technology enhances durability and efficiency, making it a premium choice for those who want reliable, continuous hot water. Compared with the Rheem Prestige, the IKONIC’s Wi-Fi features and high flow rate cater to tech-savvy homeowners with larger demands. However, the unit’s size and the need for wall mounting mean it’s less suitable where space is limited. Its higher cost reflects its advanced features, but for those who prioritize remote management and high capacity, it’s a compelling option. It’s best for large households or those who want maximum convenience and control, accepting the higher investment.
Pros:- High flow rate of 11.2 GPM for multiple simultaneous uses
- Wi-Fi connectivity for remote control and monitoring
- Built-in recirculation and dual heat exchangers for efficiency
- Designed for indoor installation with space flexibility
Cons:- Requires space for wall mounting
- Higher upfront cost than simpler models
- Dependent on Wi-Fi for full remote features
Best for: Large households needing high flow, remote management, and durable performance with smart features.
Not ideal for: Small homes or budget-conscious buyers due to its higher price and space requirements.
- Flow Rate:11.2 GPM
- Fuel Type:Liquid Propane
- BTUs:199,900
- Efficiency:Super High Efficiency
- Features:Built-in recirculation, Wi-Fi, condensing, ultra-low NOx
- Installation:Indoor
- Warranty:15 years
Our verdict“This premium unit suits large households seeking maximum capacity, remote control, and durability despite its cost and installation needs.”
How We Picked
The products in this roundup were selected based on their performance, ease of installation, build quality, and value for money. We prioritized systems that integrate recirculation pumps effectively, offering quick hot water delivery while maintaining energy efficiency. Reliability, user control features, and compatibility with different home setups also played key roles. Products were ranked by balancing their technical capabilities with practical considerations like price point and ease of maintenance, ensuring options for various budgets and needs.Factors to Consider When Choosing Tankless Water Heater With Recirculation Pump
Choosing the right tankless water heater with a recirculation pump involves understanding several key factors. While performance is critical, considerations like installation complexity, energy efficiency, and control options can significantly impact your long-term satisfaction. Making an informed choice means balancing these aspects with your household size, hot water demand, and budget. Here are the main factors to consider:Flow Rate and Capacity
Flow rate determines how many fixtures can run simultaneously without a drop in water temperature. Larger homes or households with multiple bathrooms benefit from higher GPM ratings, like the Rheem IKONIC 11.2 GPM. However, oversizing can lead to higher initial costs and inefficiency if your demand is modest. Assess your hot water needs carefully to select a model that balances capacity with efficiency.
Recirculation Pump Type and Control
Recirculation pumps vary in how they operate—some run continuously, others on a timer, and some with smart controls. Smart pumps that integrate with WiFi or smartphone apps can optimize operation and save energy, but they often cost more. Continuous circulation ensures instant hot water but increases energy use, so consider your household’s tolerance for waste versus convenience.
Fuel Type and Efficiency
Most tankless units operate on natural gas or propane, with some models offering high efficiency condensing technology. Gas models tend to deliver higher flow rates, ideal for larger households, but may involve more complex installation and venting requirements. Electric options are less common for recirculation systems but can be simpler to install and maintain, suitable for smaller homes or apartments.
Installation and Maintenance
Proper installation is vital for optimal performance, especially with recirculation pumps that require additional plumbing and electrical work. Some units are designed for easy DIY installation, but most will need a professional. Regular maintenance includes flushing the system and checking the pump, so consider the long-term upkeep when choosing a model.
Budget and Long-term Value
Pricing varies widely, with high-end models offering advanced features like smart controls and higher flow rates. While investing in a more capable unit may seem costly initially, it can reduce energy bills and improve comfort. Conversely, budget options may suffice for smaller households but might lack features that enhance convenience and efficiency over time.
Frequently Asked Questions
How does a recirculation pump improve hot water delivery?
A recirculation pump circulates hot water through the pipes continuously or on a schedule, so hot water is readily available at fixtures without waiting. This reduces water waste and saves time, especially in larger homes. Systems with smart controls can optimize pump operation, further enhancing efficiency by avoiding unnecessary circulation when hot water isn’t needed.
Are gas-powered tankless water heaters with recirculation pumps more expensive to install?
Typically, yes. Gas units often require additional venting and more complex plumbing, especially when integrating recirculation pumps. This can increase installation costs compared to electric models. However, the higher upfront expense may be justified in larger homes or those with high hot water demand, where performance gains outweigh initial costs.
Can I install a recirculation pump myself?
While some electric models with simple plumbing might be suitable for DIY installation, most gas-powered units with recirculation systems benefit from professional setup. Proper venting, electrical connections, and plumbing are critical for safety and performance. Incorrect installation can lead to efficiency losses or safety hazards, so consulting a qualified technician is generally recommended.
Will a recirculation pump increase my energy bills?
It can, especially if the pump runs continuously. However, many modern units include smart controls that limit operation to times when hot water is needed, mitigating extra energy use. Overall, the convenience often justifies the slightly higher energy costs, particularly if the system reduces water wastage and shortens wait times.
What should I prioritize if I have a small household?
In smaller homes, a electric or low-capacity gas unit with a timer-controlled recirculation pump can provide quick hot water without excessive energy costs. Focus on models with smart controls that turn off when not needed. Oversizing isn’t necessary, and choosing a unit with a manageable flow rate will save money and simplify installation.
