Choosing the right outdoor non condensing tankless water heater can make a big difference in comfort, energy use, and available space. The best models deliver reliable hot water on demand without taking up indoor room.
Below, we focus on practical buying factors like capacity, fuel type, and installation fit so you can narrow the field fast and pick a system that matches your household.
Best 10 Outdoor Non Condensing Tankless Water Heaters Picks for 2026
Whole-Home Outdoor Pick
Westinghouse 8.1 GPM Natural Gas Outdoor
- 8.1 GPM supports 3–5 fixtures
- ±1°F temperature stability
- CSA-certified with freeze protection
Best For: Whole-home outdoor hot water with stable temperature control
High-Flow Outdoor Pick
Rheem RTG-84XLN-1 8.4 GPM Outdoor
- 8.4 GPM for high-demand homes
- Hot Start Programming reduces cold bursts
- Freeze protection up to -30 degrees
Best For: High-flow outdoor natural gas installations
Propane Compact Pick
Noritz NR50ODLP Outdoor Propane 5.0 GPM
- 5.0 GPM outdoor propane model
- High-efficiency, low-NOx design
- 12-year heat exchanger warranty
Best For: Smaller propane households needing outdoor installation
Mid-Size Value Pick
Rheem RTG 7.0 GPM Natural Gas Outdoor
- 7.0 GPM for 2–3 bathroom homes
- 160,000 BTUs with hot-start programming
- Freeze protection and digital display
Best For: Mid-size homes needing reliable outdoor hot water
Compact Outdoor Performer
FOGATTI 5.1 GPM Propane Tankless
- 5.1 GPM, 120,000 BTU output
- ±1°F temperature control with water servo tech
- CSA certified outdoor propane design
Best For: Medium households needing compact outdoor hot water
Best for Everyday Use
Rinnai RUS65EP 6.5 GPM Propane
- Up to 6.5 GPM for higher demand
- Outdoor install with anti-freezing protection
- Energy- and space-efficient propane unit
Best For: Higher-flow outdoor propane setups with pro installation
Max-Output Whole-House Pick
Rheem RTG-95XLN Outdoor 9.5 GPM
- 9.5 GPM max flow for larger homes
- 199,900 BTU with EcoNet smart monitoring
- Outdoor natural-gas construction with copper and stainless steel
Best For: Large homes needing maximum outdoor hot water capacity
Whole-Home LP Efficiency
- Up to 9.5 GPM for multi-use demand
- 199,900 BTUs with hot-start programming
- Outdoor wall-mount, non-condensing design
Best For: Large propane homes needing strong outdoor hot water delivery
Compact Propane Value
- Up to 5.3 GPM for moderate household demand
- Compact outdoor build with quick standard connections
- Anti-freeze protection and low-noise fan design
Best For: Smaller homes needing a compact outdoor propane unit
Smart Outdoor Control
- 8.1 GPM and 190,000 BTUs for whole-home use
- App and remote control for easy adjustments
- Outdoor-rated with freeze and safety protections
Best For: Natural gas homes wanting smart control and outdoor installation
Whole-Home Outdoor Pick – Westinghouse 8.1 GPM Natural Gas Outdoor
If you’re comparing outdoor non condensing tankless water heaters for a whole-home setup, this Westinghouse model stands out for its 8.1 GPM output, 180,000 BTU heating power, and outdoor-rated design. It is built to support multiple fixtures at once while keeping temperature swings tight for more comfortable everyday use.
Best For: Homes, cabins, or vacation properties that need outdoor-installed, whole-house hot water with stable temperature control.
Pros:
- Up to 8.1 GPM and 180,000 BTU for 3–5 fixtures
- ±1°F temperature stability helps reduce cold bursts
- CSA-certified with freeze protection for outdoor use
- Compact wall-mounted design saves indoor space
Cons:
- Natural gas only
- Requires 120V AC power
- Best suited to homes with outdoor installation plans
Overall, this is a strong pick if you want a high-capacity outdoor unit with a focus on consistent comfort and reliable year-round operation. It balances flow, efficiency, and outdoor durability well for larger residential hot water demands.
High-Flow Outdoor Pick – Rheem RTG-84XLN-1 8.4 GPM Outdoor
Rheem RTG-84XLN-1 Mid-Efficiency 8.4GPM Outdoor Natural Gas Tankless Water Heater, Gray
Check Price On AmazonFor shoppers comparing outdoor non condensing tankless water heaters with strong flow capacity, the Rheem RTG-84XLN-1 is built around 8.4 GPM output and outdoor natural gas operation. Its Hot Start Programming and freeze protection make it a practical option for households that want reduced cold-water bursts and dependable performance in cold weather.
Best For: Outdoor natural gas installations that need high flow, ready-fire performance, and freeze protection.
Pros:
- 8.4 GPM output for higher-demand homes
- Hot Start Programming helps minimize cold water bursts
- Freeze protection rated down to -30 degrees
- Water savings tech can conserve up to 1,100 gallons per year
Cons:
- Natural gas model only
- Outdoor installation required
- Recirculation pump ready kit is not included in the listing details
This Rheem model is a solid choice when you want strong output and weather-ready features in an outdoor unit. It is especially appealing for buyers who value convenience features like hot-start behavior and efficient water use.
Propane Compact Pick – Noritz NR50ODLP Outdoor Propane 5.0 GPM
Noritz NR50ODLP Outdoor Tankless Water Heater, max. 120,000 Btuh, 5.0 Gpm - Liquid Propane
Check Price On AmazonIf you want outdoor non condensing tankless water heaters in a smaller propane package, the Noritz NR50ODLP keeps things straightforward with 5.0 GPM output and a 120,000 BTU max rating. It is designed specifically for outdoor applications and focuses on efficient, low-NOx operation rather than maximum whole-home capacity.
Best For: Smaller homes or propane users who want an outdoor-rated tankless heater with a simpler capacity profile.
Pros:
- Outdoor-specific design for outdoor applications
- 5.0 GPM output suits lighter household demand
- High-efficiency, low-NOx operation
- 12-year heat exchanger warranty listed
Cons:
- Lower flow rate than larger whole-house models
- Liquid propane only
- Not the best fit for homes with heavy simultaneous demand
This Noritz model makes sense if you need a compact outdoor propane heater and do not need the larger flow rates of the biggest units. It is a practical pick for buyers prioritizing efficiency and outdoor placement over maximum capacity.
Mid-Size Value Pick – Rheem RTG 7.0 GPM Natural Gas Outdoor
Among outdoor non condensing tankless water heaters, this Rheem RTG series unit is a practical mid-size option with 7.0 GPM capacity and 160,000 BTUs. It is designed for outdoor wall mounting, offers hot-start programming to reduce cold bursts, and includes several convenience features for everyday residential use.
Best For: 2–3 bathroom homes that want an outdoor natural gas tankless unit with solid everyday performance.
Pros:
- 7.0 GPM supports typical family hot water use
- 160,000 BTUs provide strong on-demand heating
- Hot-start programming helps prevent cold water bursts
- Includes freeze protection and digital display
Cons:
- Maximum temperature listed at 140°F
- Natural gas outdoor setup only
- Not intended for the highest-demand multi-fixture homes
This Rheem is a balanced choice if you want a mid-size outdoor heater with useful features and straightforward installation support for a qualified installer. It fits well in homes that need reliable hot water without moving up to the largest output tier.
Compact Outdoor Performer – FOGATTI 5.1 GPM Propane Tankless
If you want outdoor non condensing tankless water heaters that balance price, size, and usable output, this FOGATTI model is built around practical whole-house hot water for a medium family. It delivers up to 5.1 GPM and 120,000 BTU, with support for 2–4 outlets and precision temperature control for steadier comfort.
Best For: Medium households wanting an outdoor propane unit with strong output, compact size, and easy temperature control.
Pros:
- 5.1 GPM and 120,000 BTU for instant, endless hot water
- Water servo technology and sensors keep temperature within ±1°F
- Compact outdoor-friendly design with a remote control panel for indoor operation
- CSA certified with copper heat exchanger and 304 stainless steel burner
Cons:
- Best used at altitudes below 2000 feet
- Cold-weather use requires attention to the anti-freeze and draining guidance
- Output is aimed at 2–4 outlets rather than very large homes
Overall, this is a strong fit if you want a space-saving outdoor propane heater with smart temperature regulation and solid whole-house capability for moderate demand.
Best for Everyday Use – Rinnai RUS65EP 6.5 GPM Propane
Among outdoor non condensing tankless water heaters, this Rinnai propane model stands out for its higher flow rate and flexible outdoor installation. It offers up to 6.5 GPM, energy-saving on-demand heating, and a compact design that can support multiple appliances when sized appropriately.
Best For: Buyers who want a higher-flow outdoor propane tankless heater and are willing to use professional installation.
Pros:
- Up to 6.5 GPM flow rate for strong whole-house performance
- Outdoor installation design with anti-freezing protection
- Energy and space efficient on-demand operation
- Backed by a 12-, 5-, and 1-year residential factory warranty
Cons:
- Professional installation is recommended by the manufacturer
- Details mention flexible placement, but it’s still an outdoor-installation unit
- Higher output does not remove the need to match demand to the home’s layout
This is a sensible pick if you prioritize flow rate and a reputable outdoor propane platform, especially when you can have it installed by a technician.
Max-Output Whole-House Pick – Rheem RTG-95XLN Outdoor 9.5 GPM
If your priority is capacity, this Rheem model is one of the strongest outdoor non condensing tankless water heaters in the group, with a 9.5 GPM maximum flow rate and 199,900 BTU output. It’s designed for whole-house outdoor use, and the EcoNet monitoring system adds smart protection, comfort, and energy-saving oversight.
Best For: Larger homes that need the highest flow capacity and smart monitoring in an outdoor natural-gas unit.
Pros:
- Very high 9.5 GPM maximum flow rate for whole-house demand
- 199,900 BTU output with a wide 80°F to 140°F temperature range
- EcoNet smart monitoring adds protection, comfort, and energy savings
- Rugged copper and stainless steel construction
Cons:
- Requires natural gas, so it’s not a propane option
- Maximum temp tops out at 140°F based on the supplied specs
- Higher-capacity outdoor unit may be more than smaller households need
For users who need maximum flow and a smart outdoor natural-gas setup, this Rheem is the most capable option here and the best fit for heavier household hot-water loads.
Whole-Home LP Efficiency – Rheem 9.5 GPM Outdoor Heater
If you want an outdoor non condensing tankless water heater for a larger household, this Rheem LP model is built for steady whole-home performance. It delivers up to 9.5 GPM and 199,900 BTUs, making it a strong fit for homes that need reliable hot water for showers, laundry, and other simultaneous demand.
Best For: 2-3 bathroom homes that need a high-flow propane outdoor unit with space-saving installation.
Pros:
- Up to 9.5 GPM supports multiple hot water uses at once
- 199,900 BTUs and hot-start programming help reduce cold bursts
- Outdoor-rated cabinet and wall-mount design save indoor space
- High-efficiency non-condensing design with up to 0.82 UEF
Cons:
- Requires liquid propane, so it is not a natural gas option
- Outdoor wall installation should be handled by a qualified installer
Overall, this is the most capable high-flow option in the group for homes that need dependable propane-fired hot water outside the house. Its combination of output, efficiency, and hot-start programming makes it a practical choice for busier households.
Compact Propane Value – Ranein 5.3 GPM Outdoor Heater
Ranein Propane Gas Tankless Water Heater, Outdoor Max 5.3 GPM, 130,000 BTU Instant Hot Water Heater
Check Price On AmazonThis outdoor non condensing tankless water heater is a compact propane option for homes that want instant hot water without giving up much wall space. With up to 5.3 GPM and 130,000 BTUs, it is designed to handle several outlets while staying efficient and easy to fit into tighter installs.
Best For: Smaller households or cabins that need a space-saving outdoor propane heater with basic all-around coverage.
Pros:
- 5.3 GPM and 130,000 BTUs suit moderate whole-home use
- Compact outdoor-friendly footprint takes up little space
- Under-mounted fan design is meant to improve safety and combustion
- Anti-freeze protection adds cold-weather peace of mind
Cons:
- Not recommended for areas over 2,000 feet
- Lower flow rate than larger whole-home models
In practical terms, this Ranein unit makes sense when you need outdoor propane convenience and don’t require the highest possible output. It is a straightforward choice for smaller homes that value compact sizing and cold-weather protection.
Smart Outdoor Control – APUS 8.1 GPM WiFi Heater
For shoppers comparing outdoor non condensing tankless water heaters with smart features, this APUS natural gas model stands out for connected control and strong whole-home output. It delivers up to 8.1 GPM and 190,000 BTUs, with app and remote control that make temperature adjustments more convenient.
Best For: Homeowners who want an outdoor natural gas heater with WiFi control and strong multi-outlet performance.
Pros:
- 8.1 GPM and 190,000 BTUs support multiple fixtures at once
- App and wired controller allow remote temperature adjustment
- Outdoor-ready design helps keep indoor space uncluttered
- Anti-freeze, overheat, and flame-failure protections add safety
Cons:
- Requires natural gas, so it will not suit propane-only setups
- Smart features may be more than some buyers need
This APUS model is a strong fit if you want modern control features alongside solid heating capacity. It balances efficiency, weather resistance, and convenience well for outdoor installation.
How We Picked the Best Outdoor Non Condensing Tankless Water Heaters
For this roundup of Outdoor Non Condensing Tankless Water Heaters, we looked for models that balance real-world flow capacity, outdoor-rated construction, fuel availability, and efficiency for whole-home use. We also favored units with clear BTU and GPM specs, because those numbers make it easier to match a heater to your climate and household demand.
We gave extra weight to products that support common installation needs such as natural gas or propane options, CSA certification, low-temperature protection, and useful controls. Outdoor mounting is a major advantage, but only if the unit is sized correctly and suited to your water usage patterns.
Quick Comparison
High-GPM units are the best fit for larger homes, multiple bathrooms, and simultaneous use. Mid-range options usually work well for smaller households or homes with moderate demand. Lower-capacity propane models can be a smart pick for cabins, compact homes, or lighter hot water use.
In this category, the main tradeoff is typically between output and simplicity. Higher-BTU units often recover faster and serve more fixtures, while smaller units may be easier to install and more economical for limited demand.
Key Buying Factors for Outdoor Non Condensing Tankless Water Heaters
Flow Rate and Temperature Rise
GPM ratings only tell part of the story. Your actual performance depends on incoming water temperature and how much hot water you need at once. In colder regions, you may need a higher-capacity model than the label suggests.
Fuel Type
Choose natural gas or propane based on what is already available at your property. Swapping fuel types later is rarely simple, so confirm compatibility before you buy.
BTU Output
BTU rating is a quick indicator of heating power. Higher BTU models generally support more fixtures and faster recovery, which matters for larger households and colder climates.
Outdoor Rating and Durability
Because these units live outside, look for weather-resistant housings, freeze protection, and installation guidance that fits your climate. Outdoor Non Condensing Tankless Water Heaters should be built for exposure, not just convenience.
Controls and Efficiency Features
Useful extras like precise temperature control, WiFi, remote access, and low-NOx design can improve day-to-day use. They are not mandatory, but they add value if you want easier management or a cleaner-burning system.
Who Should Buy Which Outdoor Non Condensing Tankless Water Heaters?
Large households should prioritize higher-GPM, higher-BTU models that can handle simultaneous showers, laundry, and kitchen use. Smaller homes, cabins, and lighter-use households can save money by choosing a lower-capacity unit that still meets daily needs.
If you already have propane onsite, a propane model is often the most practical choice. If you want maximum convenience and easier integration with an existing gas line, natural gas may be the better fit. For buyers focused on long-term comfort, the best choice is the unit that matches peak demand, not just average use.
