Choosing a non condensing tankless water heater involves balancing efficiency, installation costs, and long-term savings. The Rinnai RE160eP stands out as the best overall due to its reliable performance and durability. The Rheem RTG Series 8.4 GPM offers excellent flow rates for larger households, while the Westinghouse Outdoor Model provides outdoor versatility at a competitive price. Buyers face tradeoffs between upfront costs, maintenance, and suitability for indoor versus outdoor installation. Continue reading for a comprehensive breakdown of these options and what matters most in your decision.
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Key Takeaways
- The top models balance high flow rates with energy efficiency, but the best choice depends on household size and hot water demand.
- Indoor units tend to have higher installation complexity and costs but offer better control and protection from the elements.
- Outdoor models simplify installation and reduce costs but may be less suitable for colder climates unless specifically rated for such conditions.
- Price differences often reflect build quality, flow capacity, and included features; premium models tend to last longer and require less maintenance.
- Choosing a non condensing unit over a condensing one typically saves initial cost but may result in higher energy use and shorter lifespan.
| Rinnai RE160eP Non-Condensing Propane Tankless Water Heater |  | Best Overall for Outdoor Propane Use | Flow Rate: 6.1 GPM | Fuel Type: Propane | Type: Tankless, Non-Condensing | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem RTG Series 8.4 GPM Natural Gas Tankless Water Heater Indoor |  | Best for Large Households Needing Continuous Hot Water | Flow Rate: 8.4 GPM | BTU: 180,000 | Energy Factor: 0.82 UEF | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem RTG Series 7.0 GPM Natural Gas Tankless Water Heater Outdoor |  | Best for Outdoor Use with Moderate Capacity | Flow Rate: 7.0 GPM | BTU: 160,000 | Efficiency: 0.82 UEF | VIEW ON AMAZON | See Our Full Breakdown |
| Westinghouse Tankless Water Heater Natural Gas Outdoor, CSA Certified |  | Best for Reliable Outdoor Performance with High Flow | Flow Rate: 8.1 GPM | BTU: 180,000 | Installation Type: Outdoor | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater Indoor |  | Best for Indoor High-Capacity Residential Use | Flow Rate: 7.0 GPM | BTU: 160,000 | Fuel Type: Liquid Propane | VIEW ON AMAZON | See Our Full Breakdown |
| Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater Outdoor |  | Best for Large Households Needing Outdoor Installation | Flow Rate: 7.0 GPM | BTU Output: 160,000 BTUs | Fuel Type: Liquid Propane | VIEW ON AMAZON | See Our Full Breakdown |
| FOGATTI Tankless Water Heater Natural Gas Outdoor On Demand CSA Certified |  | Best for Precise Temperature Control and Durability Outdoors | Flow Rate: 8.1 GPM | Maximum Temperature: 140°F | Heat Output: 180,000 BTU/hour | VIEW ON AMAZON | See Our Full Breakdown |
| non condensing tankless water heater | Flow Rate | Fuel Type | Installation | Warranty |
|---|---|---|---|---|
| Rinnai RE160eP Non-Condensing | 6.1 GPM | Propane | Outdoor | 15-year on heat exchanger, 5-year on parts and labor |
| Rheem RTG Series 8.4 GPM Natur | 8.4 GPM | — | Indoor, wall-mount | 15-year heat exchanger, 5-year parts |
| Rheem RTG Series 7.0 GPM Natur | 7.0 GPM | — | Outdoor | 15-year heat exchanger, 5-year parts |
| Westinghouse Tankless Water He | 8.1 GPM | Natural Gas | — | — |
| Rheem RTG Series 7.0 GPM Liqui | 7.0 GPM | Liquid Propane | Indoor, wall-mount | — |
| Rheem RTG Series 7.0 GPM Liqui | 7.0 GPM | Liquid Propane | — | 15-year heat exchanger, 5-year parts |
| FOGATTI Tankless Water Heater | 8.1 GPM | — | — | — |
More Details on Our Top Picks
Rinnai RE160eP Non-Condensing Propane Tankless Water Heater
This model stands out with its compact, outdoor-friendly design and long-lasting warranty, making it ideal for those seeking reliable propane heating without the complexity of indoor venting. Compared with the Westinghouse outdoor unit, the Rinnai offers a slightly lower flow rate but excels in durability and energy efficiency, especially given its 15-year warranty on the heat exchanger. The absence of WiFi control is a minor drawback for tech-savvy users, but for most, the straightforward operation compensates. It’s best suited for small to medium households that prefer outdoor installation and want a robust, propane-powered solution without frequent maintenance.
Pros:- Energy-efficient heating that activates only when needed
- Compact size suitable for outdoor installation
- Long-term warranty provides peace of mind
- Durable, weather-resistant design
Cons:- Requires professional installation, adding to initial costs
- WiFi control module not included, limiting smart features
- Limited to propane fuel, reducing flexibility for some users
Best for: Homeowners with outdoor space who prefer propane and need a durable, weather-resistant heater
Not ideal for: Urban dwellers with limited outdoor space or those preferring natural gas connections inside the home
- Flow Rate:6.1 GPM
- Fuel Type:Propane
- Type:Tankless, Non-Condensing
- Installation:Outdoor
- Warranty:15-year on heat exchanger, 5-year on parts and labor
Our verdict“This is a solid choice for outdoor propane users prioritizing reliability and durability over smart home integration.”
Rheem RTG Series 8.4 GPM Natural Gas Tankless Water Heater Indoor
The Rheem RTG Series indoor model is tailored for big families or homes with multiple bathrooms, thanks to its high flow rate of 8.4 GPM. It outperforms the outdoor Rheem model by offering greater hot water capacity, making it ideal for simultaneous showers and appliances. Its digital temperature controls and safety features add convenience, but the need for professional installation and venting can complicate setup. Despite the higher upfront costs, its energy efficiency and ability to serve multiple fixtures without interruption make it a standout for large households that prioritize performance and comfort.
Pros:- Provides endless hot water for multiple simultaneous uses
- Energy-efficient operation reduces utility bills
- Space-saving wall-mount design
- Advanced digital temperature controls
Cons:- Requires professional installation and venting
- Higher initial investment compared to traditional tanks
- Limited to indoor installation
Best for: Large families or multi-bathroom residences that need reliable, high-capacity hot water
Not ideal for: Small homes or apartments with limited space and low hot water demand
- Flow Rate:8.4 GPM
- BTU:180,000
- Energy Factor:0.82 UEF
- Installation:Indoor, wall-mount
- Warranty:15-year heat exchanger, 5-year parts
Our verdict“This model suits large households seeking high flow capacity and energy savings at the expense of higher upfront costs and complex installation.”
Rheem RTG Series 7.0 GPM Natural Gas Tankless Water Heater Outdoor
Compared to the indoor Rheem model, this outdoor version offers a slightly lower flow rate but benefits from easier installation and outdoor durability. It supports 2-3 simultaneous showers, making it suitable for medium-sized households. Its energy efficiency and safety features ensure consistent performance, although outdoor installation limits placement flexibility and requires a proper venting setup. This pick makes the most sense for homes where outdoor space is available and the hot water demand stays moderate, providing a balance of performance and convenience.
Pros:- Supports multiple fixtures simultaneously
- Durable outdoor design with safety features
- Energy-efficient for ongoing savings
Cons:- Limited to outdoor use only
- Requires professional installation
- Higher initial cost
Best for: Families with outdoor space needing a reliable, moderate-capacity heater
Not ideal for: Homes with very high hot water demand or no outdoor installation options
- Flow Rate:7.0 GPM
- BTU:160,000
- Efficiency:0.82 UEF
- Installation:Outdoor
- Warranty:15-year heat exchanger, 5-year parts
Our verdict“This outdoor model is best for homes with moderate hot water needs and available outdoor space, trading some capacity for easier installation.”
Westinghouse Tankless Water Heater Natural Gas Outdoor, CSA Certified
Compared to the Rheem outdoor unit, the Westinghouse offers a slightly higher flow rate of 8.1 GPM, making it a strong choice for households with higher simultaneous hot water needs. Its CSA certification and freeze protection features enhance outdoor reliability, especially in colder climates. While it provides excellent temperature stability and energy efficiency, it requires outdoor space and natural gas supply, which could limit placement flexibility. This heater suits those wanting a dependable, high-capacity outdoor option that can handle multiple fixtures with ease.
Pros:- Supports multiple fixtures simultaneously
- Stable water temperature within ±1°F
- CSA certified and freeze protected
- High flow rate for larger households
Cons:- Requires outdoor installation space
- Dependent on natural gas supply
- Potentially higher upfront cost
Best for: Homes needing high flow outdoor water heating with CSA certification and freeze protection
Not ideal for: Properties without outdoor space or with limited natural gas supply
- Flow Rate:8.1 GPM
- BTU:180,000
- Installation Type:Outdoor
- Fuel Type:Natural Gas
- Certifications:CSA
Our verdict“Ideal for larger households seeking a high-capacity outdoor heater with certification and climate resilience, at the cost of outdoor space and natural gas dependency.”
Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater Indoor
This indoor Rheem model offers a balanced combination of capacity and safety features, supporting 2-3 simultaneous fixtures with a flow rate of 7.0 GPM. It mirrors the outdoor propane heater’s capacity but benefits from indoor installation, which appeals to those avoiding outdoor exposure or needing a more discreet setup. Its digital controls and safety protections, including leak detection and overheat prevention, make it attractive for large households. However, venting requirements and higher initial costs compared to traditional tanks are considerations. It’s an excellent choice for those who want high capacity inside their home without sacrificing safety or efficiency.
Pros:- Provides reliable, continuous hot water for multiple fixtures
- High energy efficiency reduces utility bills
- Space-saving wall-mount design
- Enhanced safety features
Cons:- Requires professional venting installation
- Initial cost higher than traditional tank heaters
- Indoor placement may limit flexible positioning
Best for: Large families or multi-bathroom homes seeking indoor, space-efficient hot water solutions
Not ideal for: Smaller homes or those unwilling to install venting systems required for indoor gas units
- Flow Rate:7.0 GPM
- BTU:160,000
- Fuel Type:Liquid Propane
- Efficiency:0.82 UEF
- Installation:Indoor, wall-mount
Our verdict“This indoor model is ideal for large households prioritizing safety, capacity, and indoor installation flexibility, despite higher upfront costs.”
Rheem RTG Series 7.0 GPM Liquid Propane Tankless Water Heater Outdoor
The Rheem RTG Series 7.0 GPM stands out for its ability to provide continuous hot water for larger households, especially those with multiple bathrooms. Compared to models like the FOGATTI 8.1 GPM outdoor heater, it offers slightly lower flow capacity but benefits from a highly efficient design and longer warranty coverage. Its outdoor-only setup means no venting is required, saving space and installation costs, yet this also makes it unsuitable for indoor use. The digital temperature control enhances user precision, but professional installation is necessary, and regular maintenance is recommended to sustain performance. This model is an excellent choice for big families who prioritize durability and outdoor installation.
Pros:- Provides endless hot water for multiple simultaneous uses
- High energy efficiency with 0.82 UEF reduces utility bills
- Compact outdoor design eliminates need for venting
Cons:- Requires professional installation, adding upfront costs
- Limited to outdoor use, unsuitable for indoor installation
Best for: Families with multiple bathrooms seeking a high-capacity outdoor tankless heater
Not ideal for: Homeowners wanting indoor installation or a compact unit for small spaces
- Flow Rate:7.0 GPM
- BTU Output:160,000 BTUs
- Fuel Type:Liquid Propane
- Efficiency:0.82 UEF
- Installation Type:Outdoor
- Warranty:15-year heat exchanger, 5-year parts
Our verdict“This heater is ideal for large households that want outdoor setup and reliable performance without indoor venting.”
FOGATTI Tankless Water Heater Natural Gas Outdoor On Demand CSA Certified
The FOGATTI outdoor tankless heater offers a slightly higher flow rate of 8.1 GPM, making it suitable for larger households or demanding applications compared to the Rheem RTG series. Its durable construction and CSA certification highlight its reliability across seasons and weather conditions. Unlike the Rheem, it operates on natural gas and features a user-friendly wall mount, simplifying installation. Precise temperature control within ±1°F ensures comfort and safety, but its weight and size may be a challenge for limited outdoor spaces. Additionally, proper ventilation and gas connection are mandatory, which can complicate setup for some users. This heater is best suited for those needing high flow and durability in outdoor environments.
Pros:- High flow rate of 8.1 GPM supports multiple outlets simultaneously
- Durable, weather-resistant construction for all-season use
- Precise temperature regulation within ±1°F
Cons:- Heavy and somewhat bulky for small outdoor spaces
- Requires natural gas connection and proper ventilation
Best for: Homeowners with natural gas access who need high flow and precise temperature control outdoors
Not ideal for: Residents with small outdoor areas or those lacking natural gas connection
- Flow Rate:8.1 GPM
- Maximum Temperature:140°F
- Heat Output:180,000 BTU/hour
- Mount Type:Wall
- Item Dimensions:17.1″ W x 26.2″ H x 7.1″ D
- Item Weight:43.2 pounds
- Voltage:120 volts
- Special Features:CSA Certified, 2-5 Years Warranty, Easy Installation
Our verdict“This model is best for users seeking robust outdoor performance with high flow and exact temperature control, provided natural gas is accessible.”
How We Picked
These products were selected based on a combination of performance metrics, build quality, energy efficiency, and user reviews. Priority was given to units that deliver reliable hot water flow at realistic household demands, especially in non-condensing models known for their simplicity and durability. We also considered installation versatility—indoor versus outdoor—and the manufacturer’s reputation for support and longevity. By comparing flow rates, ease of installation, price, and warranty coverage, I prioritized options that provide clear value for different types of buyers, ensuring each product fills a specific niche in this category.| non condensing tankless water heater | Fuel Type | Installation |
|---|---|---|
| Rinnai RE160eP Non-Condensing | Propane | Outdoor |
| Rheem RTG Series 8.4 GPM Natur | — | Indoor, wall-mount |
| Rheem RTG Series 7.0 GPM Natur | — | Outdoor |
| Westinghouse Tankless Water He | Natural Gas | — |
| Rheem RTG Series 7.0 GPM Liqui | Liquid Propane | Indoor, wall-mount |
| Rheem RTG Series 7.0 GPM Liqui | Liquid Propane | — |
| FOGATTI Tankless Water Heater | — | — |
Factors to Consider When Choosing Non Condensing Tankless Water Heater
When selecting a non condensing tankless water heater, it’s vital to consider factors beyond just price and brand. These units vary widely in capacity, installation requirements, and operational costs. Making an informed choice involves understanding your household’s hot water needs, the environment where the unit will be installed, and your long-term energy goals. The following sections highlight key considerations that help differentiate models and prevent common buying mistakes.Flow Rate and Hot Water Demand
The primary factor in choosing a non condensing tankless water heater is its flow rate, usually measured in gallons per minute (GPM). Accurately estimating your household’s hot water needs ensures you select a unit that can keep up without constantly running at full capacity. Oversizing can lead to unnecessary costs, while undersizing results in inadequate hot water. Consider all fixtures used simultaneously—dishwashers, showers, laundry—to determine the right flow rate for your household.
Indoor vs. Outdoor Installation
Indoor models typically offer better protection from the elements and may provide more precise temperature control but often come with higher installation complexity and costs. Outdoor units, like some Rheem and Westinghouse options, simplify installation and reduce immediate costs but require models rated for external conditions. In colder climates, outdoor units must have freeze protection or be installed with additional insulation. Carefully evaluate your climate and space constraints to avoid costly mistakes later.
Energy Efficiency and Operating Costs
Non condensing units generally have lower upfront costs compared to condensing models but can have higher ongoing energy expenses due to lower efficiency. Look for units with good energy factor ratings and consider insulation and venting needs that can improve overall efficiency. Budgeting for the long term means weighing initial savings against potential higher utility bills, especially if the unit is used extensively or in colder environments.
Installation and Maintenance
Proper installation is critical to ensure safety, performance, and longevity. Many models require professional installation, especially for gas connections and venting. Also, consider maintenance accessibility—some units may need periodic flushing or filter replacement. Choosing a model with straightforward installation requirements and reliable customer support can save headaches and costs in the future. Keep in mind that some units have more durable components, reducing the frequency of repairs.
Price and Warranty
While cost is a significant factor, it should not be the sole consideration. Higher-priced units often come with better warranties and longer lifespans, translating into savings over time. Be wary of very low-cost options that may lack durability or support. Prioritize units from reputable manufacturers offering comprehensive warranties and accessible customer service, especially if you plan to rely on the unit for years to come.
Frequently Asked Questions
Is a non condensing tankless water heater more energy-efficient than a condensing unit?
Generally, condensing units are more energy-efficient because they reclaim heat from exhaust gases, reducing waste. Non condensing units are simpler and less expensive upfront but tend to consume more energy over their lifespan. If energy savings and long-term operational costs are priorities, a condensing model might be worth the extra investment. However, for those seeking straightforward installation and maintenance, non condensing options remain a solid choice.
Can I install a non condensing tankless water heater outside in cold climates?
Yes, some outdoor models are rated for cold climates, provided they have adequate freeze protection features. It’s important to select a unit explicitly designed for outdoor use in your climate zone. Otherwise, freezing temperatures can damage the unit, leading to costly repairs or replacements. Proper insulation and installation in sheltered locations can also help extend the lifespan of outdoor units in colder environments.
How long does a typical non condensing tankless water heater last?
Most non condensing units are designed to last between 10 and 15 years with proper maintenance. Durability depends heavily on build quality, usage patterns, and regular servicing. Choosing a reputable brand with a strong warranty can help ensure your investment lasts as long as possible. Regular flushing and inspections can also mitigate mineral buildup and other common issues that shorten the lifespan.
What is the main advantage of a non condensing tankless water heater over condensing models?
The primary advantage is the lower initial purchase and installation cost. Non condensing units are mechanically simpler, making them easier and cheaper to install and repair. They also tend to be more compact and easier to fit into tight spaces. However, they usually have lower energy efficiency, which could lead to higher operating costs over time.
Should I consider a tankless water heater if I have a large household?
Yes, but with caution. For large households, selecting a model with a high flow rate—typically above 8 GPM—is essential to meet simultaneous hot water demands. Non condensing units with higher capacity can serve multiple fixtures, but you must ensure the unit is rated for your peak demand. If your household frequently exceeds the capacity of a smaller unit, investing in a larger or multiple units might be necessary to prevent shortages.
Conclusion
For most homeowners, the Rinnai RE160eP offers a reliable, all-around solution as the best overall pick, combining durability and performance. Those looking for the best value might prefer the Rheem RTG Series 8.4 GPM for its high flow capacity at a reasonable price. If budget is tight, outdoor models like the Westinghouse CSA Certified provide outdoor convenience without breaking the bank. For newcomers, simpler, indoor units like Rheem’s 7.0 GPM models are easier to install and maintain. Finally, for large households or colder climates, opting for units with higher capacity or outdoor rated models will better meet demanding needs while avoiding performance bottlenecks.
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