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Finding the best propane tankless water heaters requires matching flow rates and BTU output to your home’s specific hot water demand. We compared 14 models using only the specifications published on their listings. The Rinnai 11.1 GPM Condensing Tankless Water Heater leads because its 11.1 GPM capacity supports seven or more simultaneous fixtures. This high flow rate ensures consistent performance for large households. Other options offer indoor convenience or compact designs for smaller spaces. Use this guide to decide which unit fits your fixture count and installation location.
01 Match GPM to your fixture count
Your home’s simultaneous hot water needs dictate the required flow rate. Large households with seven or more fixtures should look for units like the Rinnai 11.1 GPM model. Smaller setups with two to three fixtures can use lower output options like the APUS 4.42 GPM heater. Always verify the gallon-per-minute spec matches your usage to avoid temperature drops.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | Rinnai 11.1 GPM Condensing Tankless Water Heater Best overall | Large homes needing high flow and recirculation | |
| 2 | Ranein 4.3 GPM Indoor Propane Tankless Water Heater Also great | Indoor homes needing reliable mid-range flow | |
| 3 | APUS 95,000 BTU 4.42 GPM Indoor Propane Heater Best budget | steady hot water for 2–3 fixtures | |
| 4 | ThermoMate 4 GPM Propane Tankless Water Heater Also great | single bathroom hot water needs | |
| 5 | MIZUDO 120,000 BTU Propane Tankless Water Heater Also great | flexible installation and smart control | |
| 6 | Rinnai 6.1 GPM Outdoor Propane Water Heater Best premium | outdoor homes needing five-fixture capacity | |
| 7 | GASLAND 7.6 GPM Propane Tankless Water Heater Also great | Whole-house hot water with high flow demand | |
| 8 | APUS 140,000 BTU Indoor Propane Tankless Water Heater Also great | Whole-home hot water with precise temperature control | |
| 9 | Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater Also great | outdoor residential use with compact needs | |
| 10 | VancEpic 4.3 GPM Propane Tankless Heater Best child safety lock | indoor family use with precise temp control | |
| 11 | Westinghouse HW180A0G-LP Propane Also great | Whole-home hot water with smart control | |
| 12 | GASLAND Gasmart C 5.8 GPM Indoor Propane Heater Also great | Whole-house indoor propane heating with compact design | |
| 13 | VEVOR 4.3 Gal Propane Tankless Water Heater Also great | moderate indoor propane heating needs | |
| 14 | Novieex 3.6 GPM Propane Tankless Water Heater Also great | Small indoor bathrooms with moderate hot water needs |
02 The best fit for you
- You need high flow for seven or more fixtures – Rinnai 11.1 GPM Condensing Tankless Water Heater – It delivers 11.1 GPM to handle large household demand.
- You want the most compact model on the list – GASLAND Gasmart C 5.8 GPM Indoor Propane Heater – Its 3.54-inch width fits tight indoor spaces easily.
- You need precise temperature control for family safety – VancEpic 4.3 GPM Propane Tankless Heater – It includes a child safety lock and LED display.
- You require outdoor installation with a booster pump – Rinnai 11.1 GPM Condensing Tankless Water Heater – It features a booster pump for outdoor condensing use.
Rinnai 11.1 GPM Condensing Tankless Water Heater
Best for: Large homes needing high flow and recirculation
- Fuel Type
- Propane
- Max Flow Rate
- 11.1 GPM
- Heating Capacity
- 199k BTU
- Installation Location
- Indoor, Outdoor
- Fixture Capacity
- 7 fixtures
- Features
- Tankless, Booster Pump
This Rinnai tankless water heater delivers 11.1 GPM at 199,000 BTU using propane or natural gas. It supports seven fixtures simultaneously and fits indoor or outdoor spaces. The unit includes a built-in recirculation pump and Smart-Circ technology to learn your usage patterns. Its compact 19x31x19 inch frame weighs 58 pounds. You get a high 0.98 UEF rating for efficient operation.
- 11.1 GPM flow rate supports up to 7 fixtures
- 199,000 BTU heating capacity for high demand
- Built-in recirculation pump with Smart-Circ learning technology
- 0.98 energy efficiency factor (UEF)
- Versa Vent system allows indoor or outdoor installation
- 58-pound weight is heavier than many indoor units
- 199,000 BTU is lower than the 180,000 BTU Westinghouse option
- WiFi control requires a separate Controlr module purchase
- You need hot water for multiple simultaneous fixtures
- You want a condensing unit with high energy efficiency
- You require a built-in pump for recirculation
- You need a unit with included WiFi connectivity
- You require a flow rate higher than 11.1 GPM
- You prefer a non-condensing installation only
Verdict: Rinnai RXP199iN 11.1 GPM Propane Heater is the top pick for large households needing high flow and efficiency. It fits homes with seven or more fixtures requiring simultaneous hot water.
Ranein 4.3 GPM Indoor Propane Tankless Water Heater
Best for: Indoor homes needing reliable mid-range flow
- Fuel Type
- Propane
- Max Flow Rate
- 4.3 GPM
- Heating Capacity
- 100,000 BTU
- Installation Location
- Indoor
- Fixture Capacity
- 3-4 water points
- Temperature Range
- 95°F-155°F
The Ranein 100,000 BTU unit delivers 4.3 GPM for indoor whole-home use. It supports three to four simultaneous water points. The system features an oxygen-free copper heat exchanger and four preset modes. You get precise temperature control from 95°F to 155°F. This model includes a vent pipe for easier indoor installation. It suits households needing reliable hot water without a large tank.
- 100,000 BTU heating capacity for strong performance
- 4.3 GPM max flow rate for multiple fixtures
- Includes vent pipe for indoor setup
- Oxygen-free copper heat exchanger for durability
- Four preset modes for specific water needs
- 4.3 GPM flow rate is lower than top competitors reaching 7.9 GPM
- 100,000 BTU input is less powerful than 180,000 BTU options
- Limited to indoor installation only
- You need a propane heater for an indoor space
- You want a unit that includes the vent pipe
- You require support for three to four water points
- You need a flow rate higher than 4.3 GPM
- You are looking for an outdoor-rated unit
- You want the highest available BTU capacity
Verdict: Ranein 100K BTU Propane Tankless Heater provides solid indoor performance with included ventilation. It fits homes that prioritize ease of installation and steady flow over maximum power output.
APUS 95,000 BTU 4.42 GPM Indoor Propane Heater
Best for: steady hot water for 2–3 fixtures
- Fuel Type
- Propane
- Max Flow Rate
- 4.42 GPM
- Heating Capacity
- 95,000 BTU
- Installation Location
- Indoor
- Voltage
- 120V
- Fixture Capacity
- 2–3 Fixtures
The APUS propane tankless water heater delivers 95,000 BTU of heating capacity with a max flow rate of 4.42 GPM. It supports 2–3 fixtures simultaneously and maintains temperature within ±1°F using smart CPU technology. This indoor unit features oxygen-free copper heat exchangers for 98% thermal efficiency. Its compact design includes an LED touchscreen and operates quietly at 36dB. It is suitable for homes needing steady hot water for multiple fixtures.
- 95,000 BTU heating capacity
- 4.42 GPM max flow rate
- 98% thermal efficiency with copper heat exchangers
- Temperature stability within ±1°F
- Quiet operation at 36dB
- 95,000 BTU is lower than many competitors offering 120,000 to 180,000 BTU
- 4.42 GPM flow rate is modest compared to units reaching 7.9 GPM
- 2-year warranty is shorter than industry standards
- You need steady hot water for 2–3 fixtures
- You want high thermal efficiency for energy savings
- You prefer quiet operation under 40dB
- You require flow rates above 5.0 GPM
- You need heating capacity exceeding 100,000 BTU
- You want a warranty longer than 2 years
Verdict: APUS 95,000 BTU Propane Tankless Heater offers precise temperature control and high efficiency for small to medium households. It fits buyers who prioritize steady water quality and quiet operation over maximum flow speed.
ThermoMate 4 GPM Propane Tankless Water Heater
Best for: single bathroom hot water needs
- Fuel Type
- Propane
- Max Flow Rate
- Up to 4 GPM
- Heating Capacity
- 98,500 BTU
- Installation Location
- Indoor
- Voltage
- 120V
- Fixture Capacity
- 1 shower and 1 faucet
The ThermoMate indoor propane water heater delivers 98,500 BTU of heating power with a maximum flow rate of 4 GPM. It supports one shower and one faucet simultaneously at a 43°F temperature rise. This unit features a copper heat exchanger and precise digital controls for stable water temperature. Its compact design fits standard indoor spaces, making it suitable for households with moderate hot water demands.
- 98,500 BTU heating capacity for reliable hot water
- Up to 4 GPM flow rate supports one shower and one faucet
- Copper heat exchanger offers 98% thermal efficiency
- Precise temperature control maintains stability within ±1°F
- CSA certified with multiple safety protections
- Lower 4 GPM flow rate compared to other models reaching 7.9 GPM
- 98,500 BTU capacity is lower than competitors offering 140,000 to 180,000 BTU
- Single shower and faucet fixture capacity limits simultaneous use
- You need a compact unit for a single bathroom or kitchen
- You want precise temperature control for consistent shower comfort
- You require CSA certification for indoor safety compliance
- You need to run multiple showers simultaneously
- You require high flow rates above 5 GPM
- You are installing in a cold climate with very low inlet temperatures
Verdict: ThermoMate 98,500 BTU Propane Heater is a practical choice for users who prioritize efficiency and precise temperature stability over high-volume flow. It fits well in homes with moderate hot water needs where space is limited.
MIZUDO 120,000 BTU Propane Tankless Water Heater
Best for: flexible installation and smart control
- Fuel Type
- Propane
- Max Flow Rate
- 5.1 GPM
- Heating Capacity
- 120,000 BTU
- Installation Location
- Indoor or Outdoor
- Fixture Capacity
- 2–4 outlets
- Installation Type
- Whole House
The MIZUDO unit delivers 120,000 BTU of heating power with a maximum flow rate of 5.1 GPM. It supports 2–4 outlets and works for indoor or outdoor installation. You get smart app control and stable temperature maintenance within 1℉. This propane heater suits homes needing reliable whole-house coverage with flexible placement options.
- 120,000 BTU heating capacity
- 5.1 GPM max flow rate
- Smart WiFi and app control
- Indoor or outdoor convertible installation
- Temperature stability within 1℉
- Lower flow rate than 6.1 GPM or 7.9 GPM competitors
- Requires separate vent pipe accessory for indoor use
- Shorter 2-year full unit warranty compared to 5-year heat exchanger coverage
- You need indoor or outdoor flexibility
- You want app-based temperature control
- You require stable water temperature
- You need more than 5.1 GPM
- You prefer a higher BTU output
- You want a longer standard warranty
Verdict: The MIZUDO 120,000 BTU Propane Tankless Water Heater fits homes that value smart control and flexible installation over maximum flow speed. It provides steady performance for 2–4 outlets.
Rinnai 6.1 GPM Outdoor Propane Water Heater
Best for: outdoor homes needing five-fixture capacity
- Fuel Type
- Propane
- Max Flow Rate
- 6.1 GPM
- Heating Capacity
- 160k BTU
- Installation Location
- Outdoor
- Fixture Capacity
- 5 fixtures at once
- Features
- Tankless
The Rinnai RE160eP is a non-condensing outdoor unit built for propane. It delivers 6.1 GPM at 160k BTU. This capacity supports five fixtures running simultaneously. Its compact frame measures 14.1 by 24.6 inches. You get a 15-year heat exchanger warranty. This model suits homes needing reliable outdoor hot water without condensing complexity.
- 160k BTU heating capacity for high demand
- 6.1 GPM flow rate supports five fixtures
- 15-year limited warranty on the heat exchanger
- Compact outdoor design fits tight spaces
- Outdoor installation limits placement options
- 6.1 GPM is lower than the 7.9 GPM and 8.5 GPM models on this list
- 160k BTU is less powerful than the 180k BTU option available
- You need a dedicated outdoor propane heater
- You want a 15-year heat exchanger warranty
- You require hot water for up to five fixtures
- You need an indoor installation unit
- You want the highest possible flow rate on the list
- You prefer a condensing model for efficiency
Verdict: Rinnai RE160eP Propane Outdoor Heater offers solid 160k BTU performance for outdoor use. It fits buyers who prioritize a long heat exchanger warranty over maximum flow speed.
GASLAND 7.6 GPM Propane Tankless Water Heater
Best for: Whole-house hot water with high flow demand
- Fuel Type
- Propane
- Max Flow Rate
- 7.6 GPM
- Heating Capacity
- 199000 BTU
- Installation Location
- Indoor
- Installation Type
- Whole House
- Features
- Tankless
The GASLAND Gasmart E is a whole-house propane tankless water heater designed for indoor installation. It delivers a maximum flow rate of 7.6 GPM powered by 199,000 BTU of heating capacity. This unit features a compact footprint measuring 14.3 by 24.7 inches and weighs 37.5 pounds. Its high output makes it suitable for homes requiring significant hot water volume simultaneously.
- Maximum flow rate of 7.6 GPM supports whole-house usage
- 199,000 BTU heating capacity provides robust hot water output
- Compact dimensions of 14.3 x 24.7 inches fit small spaces
- CSA certified for safety and reliability
- Heavier build at 37.5 pounds compared to lighter compact units
- Indoor-only installation limits outdoor placement options
- Higher BTU and GPM specs may exceed needs for single-bathroom setups
- You need a high-flow unit for multiple simultaneous showers
- You require a powerful whole-house solution for a large home
- You have indoor space for a slightly heavier, compact unit
- You need an outdoor-rated unit for exterior mounting
- You prefer a lighter, more portable installation option
- You only need hot water for a single sink or shower
Verdict: GASLAND Gasmart E 7.6 GPM Propane delivers high capacity for whole-house needs. It fits buyers who prioritize flow rate and indoor power over compact weight or outdoor versatility.
APUS 140,000 BTU Indoor Propane Tankless Water Heater
Best for: Whole-home hot water with precise temperature control
- Fuel Type
- Propane
- Max Flow Rate
- Up to 6.8 GPM
- Heating Capacity
- 140,000 BTU
- Installation Location
- Indoor
- Voltage
- 120V AC
- Fixture Capacity
- 4–5 Points
The APUS propane tankless water heater delivers 140,000 BTU and up to 6.8 GPM for 4–5 water points. It features a zero-cold-water circulation pump and ±1°F temperature control. The unit includes smart season comfort and anti-freeze protection. You should choose this indoor model if you need high flow for whole-home use and want precise temperature stability.
- 140,000 BTU heating capacity
- Up to 6.8 GPM max flow rate
- Built-in booster pump for 130% flow increase
- ±1°F temperature precision with LED display
- Zero-cold-water technology with 0.81 UEF
- Requires 120V AC power for the pump and controller
- Anti-freeze protection requires draining if unused in cold weather
- Heavier build at 26.9 pounds
- You need hot water for 4–5 simultaneous fixtures
- You want precise temperature control within ±1°F
- You prefer a whole-home solution with a booster pump
- You only need a single point of use
- You cannot provide 120V AC power for the unit
- You need an outdoor-rated model
Verdict: APUS 140k BTU Propane Tankless Water Heater fits households needing high flow for multiple bathrooms. It suits users who value precise temperature stability and whole-home coverage.
Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater
Best for: outdoor residential use with compact needs
- Fuel Type
- Propane
- Max Flow Rate
- 5.3 GPM
- Installation Location
- Outdoor
- Fixture Capacity
- multiple appliances
- Features
- Tankless
- Form Factor
- Compact
The Rinnai V53DeP is a propane tankless water heater designed for outdoor installation. It delivers a maximum flow rate of 5.3 GPM, supporting multiple appliances simultaneously. The compact unit measures 13 by 30 by 13 inches and weighs 33 pounds. This model suits households needing reliable endless hot water in tight outdoor spaces while prioritizing energy efficiency.
- 5.3 GPM max flow rate
- Compact 13-inch width design
- Outdoor installation capability
- 10-year heat exchanger warranty
- 5.3 GPM flow rate is lower than top competitors reaching 7.9 GPM
- Outdoor-only installation limits placement options
- 33-pound weight is moderate for mounting
- You need an outdoor propane unit
- You want a compact footprint
- You value long-term warranty coverage
- You require indoor installation
- You need flow rates above 6 GPM
- You prefer a smaller physical size
Verdict: Rinnai V53DeP 5.3 GPM Outdoor fits outdoor residential setups where space is limited and a 5.3 GPM flow rate meets your multi-appliance needs.
VancEpic 4.3 GPM Propane Tankless Heater
Best for: indoor family use with precise temp control
- Fuel Type
- Propane
- Max Flow Rate
- 4.3 GPM
- Heating Capacity
- 100,000 BTU
- Installation Location
- Indoor
- Fixture Capacity
- 3-4 water outlets
- Features
- Tankless, Child Safety Lock, LED Display
The VancEpic propane tankless water heater delivers 100,000 BTU and up to 4.3 GPM for indoor use. It supports 3-4 water outlets simultaneously. The unit features an oxygen-free copper heat exchanger and maintains temperature within ±1°F. It includes a child safety lock and four preset modes. This model suits families needing stable hot water in compact indoor spaces.
- 100,000 BTU heating capacity
- 4.3 GPM maximum flow rate
- ±1°F precise temperature control
- Child safety lock included
- Oxygen-free copper heat exchanger
- Lower flow rate than the 7.9 GPM Westinghouse model
- Lower BTU output than the 180,000 BTU Westinghouse unit
- Heavier build at 25.1 pounds compared to lighter competitors
- You need a propane unit for indoor installation
- You require stable temperature control within ±1°F
- You want a child safety lock for family use
- You need more than 4.3 GPM flow
- You prefer a non-condensing unit with higher BTU
- You want a WiFi-enabled smart model
Verdict: VancEpic 4.3 GPM Propane Tankless Water Heater fits households prioritizing precise temperature stability and safety features over high-volume flow. It is a solid choice for 3-4 point indoor setups.
Westinghouse HW180A0G-LP Propane
Best for: Whole-home hot water with smart control
- Fuel Type
- Propane
- Max Flow Rate
- 7.9 GPM
- Heating Capacity
- 180,000 BTU
- Installation Location
- Indoor
- Voltage
- 120V AC
- Fixture Capacity
- 3–5 fixtures
The Westinghouse HW180A0G-LP is a propane tankless water heater designed for indoor whole-house use. It delivers 180,000 BTU and up to 7.9 GPM. This capacity supports 3–5 fixtures simultaneously. Smart WiFi and voice control allow remote adjustments. Precise ±1°F temperature stability reduces fluctuations. The unit requires 120V AC power and standard 3/4" plumbing.
- 180,000 BTU heating capacity
- 7.9 GPM max flow rate
- ±1°F temperature stability
- WiFi and voice control
- Supports 3–5 fixtures
- 17.1-inch width is bulkier than compact models
- Indoor-only installation limits outdoor use
- Requires 120V AC power connection
- You need high flow for multiple simultaneous fixtures
- You want precise temperature control within ±1°F
- You prefer remote app or voice management
- You require outdoor installation
- You lack a 120V AC power source nearby
- You prefer a more compact wall-mounted unit
Verdict: Westinghouse HW180A0G-LP Propane delivers strong 180,000 BTU performance for whole-home hot water. It suits households needing high flow rates and smart control features.
GASLAND Gasmart C 5.8 GPM Indoor Propane Heater
Best for: Whole-house indoor propane heating with compact design
- Fuel Type
- Propane
- Max Flow Rate
- 5.8 GPM
- Heating Capacity
- 150,000 BTU
- Installation Location
- Indoor
- Installation Type
- Whole House
- Features
- Tankless
The GASLAND Gasmart C is a propane tankless water heater designed for whole-house indoor use. It delivers a maximum flow rate of 5.8 GPM with a heating capacity of 150,000 BTU. This unit features a compact footprint measuring 3.54 by 23.3 inches. It offers high energy efficiency with a UEF of 0.8. You will get continuous hot water for showers and laundry without waiting for a tank to reheat.
- 150,000 BTU heating capacity for strong performance
- 5.8 GPM max flow rate supports multiple fixtures
- Compact 3.54-inch width fits in tight spaces
- 0.8 UEF rating indicates high energy efficiency
- 150,000 BTU is lower than the 180,000 BTU Westinghouse model
- 5.8 GPM flow rate is below the 7.9 GPM Westinghouse unit
- Indoor installation only, unlike the outdoor Rinnai V53DeP
- You need a high-capacity unit for whole-house hot water
- You have limited space for a compact wall-mounted heater
- You want a propane system with high energy efficiency
- You require outdoor installation capabilities
- You need a flow rate exceeding 6 GPM
- You prefer a unit with over 180,000 BTU capacity
Verdict: GASLAND Gasmart C 150k BTU Propane provides robust indoor heating with a 150,000 BTU output. It suits households prioritizing compact dimensions and high efficiency over maximum flow volume.
VEVOR 4.3 Gal Propane Tankless Water Heater
Best for: moderate indoor propane heating needs
- Fuel Type
- Propane
- Heating Capacity
- 100,000 BTU/h
- Installation Location
- Indoor
- Installation Type
- Whole House
- Features
- Tankless
- Dimensions
- 13.8 × 13.8 × 21.7 inches
This VEVOR unit delivers 100,000 BTU/h of heating capacity for indoor whole-house use. It provides a flow rate of 4.3 gallons per minute, making it suitable for homes with moderate hot water demands. The device features smart temperature control that maintains water within ±1℉ of your setting. An LED display shows real-time status. It weighs 19.8 pounds and measures 13.8 by 21.7 inches.
- 100,000 BTU/h heating capacity
- 4.3 GPM flow rate
- ±1℉ precision temperature control
- LED display for real-time monitoring
- 4.3 GPM flow rate is lower than many competitors offering 5.1 to 7.9 GPM
- 100,000 BTU output is less powerful than options reaching 180,000 BTU
- You need a reliable indoor propane heater for moderate usage
- You prefer precise temperature stability within ±1℉
- You want a compact unit with an LED display
- You require high flow rates above 5 GPM for multiple simultaneous showers
- You need maximum heating power for large households
- You are looking for outdoor installation options
Verdict: VEVOR 4.3 Gal Propane Tankless Heater suits buyers who prioritize steady temperature control over high-volume flow. It is a solid choice for moderate indoor needs but falls short for high-demand households.
Novieex 3.6 GPM Propane Tankless Water Heater
Best for: Small indoor bathrooms with moderate hot water needs
- Fuel Type
- Propane
- Max Flow Rate
- Up to 3.6 GPM
- Heating Capacity
- 86,000 BTU
- Installation Location
- Indoor
- Voltage
- 110V-120V AC
- Fixture Capacity
- 2-3 Point Use
The Novieex RS-13 delivers up to 3.6 GPM of hot water using 86,000 BTU of propane power. It features a precise digital thermostat with a 95°F to 149°F range and an LED interface. This compact unit measures 17.3 inches wide and weighs 19.8 pounds. It is designed for indoor use and suits households needing reliable hot water for two to three fixtures simultaneously.
- 86,000 BTU heating capacity
- Up to 3.6 GPM flow rate
- Digital thermostat with ±1°F control
- LED touchscreen interface
- Compact wall-mounted design
- Lower 86,000 BTU heating capacity compared to competitors reaching 180,000 BTU
- Reduced 3.6 GPM flow rate versus models offering up to 7.9 GPM
- Indoor-only installation limits outdoor placement options
- You need a compact unit for a small bathroom or kitchen
- You want precise temperature control with a digital display
- You require a reliable indoor propane heater for light use
- You need high flow rates for multiple simultaneous showers
- You require an outdoor-rated unit for exterior installation
- You want maximum heating power for whole-house demand
Verdict: Novieex 3.6 GPM Propane Tankless Heater fits small households prioritizing space-saving design and precise temperature management over high-volume hot water delivery.
03 Specifications side by side
| Spec | Rinnai 11.1 GPM Condensing Tankless Water Heater | Ranein 4.3 GPM Indoor Propane Tankless Water Heater | APUS 95,000 BTU 4.42 GPM Indoor Propane Heater | ThermoMate 4 GPM Propane Tankless Water Heater | MIZUDO 120,000 BTU Propane Tankless Water Heater | Rinnai 6.1 GPM Outdoor Propane Water Heater | GASLAND 7.6 GPM Propane Tankless Water Heater | APUS 140,000 BTU Indoor Propane Tankless Water Heater | Rinnai 5.3 GPM Outdoor Propane Tankless Water Heater | VancEpic 4.3 GPM Propane Tankless Heater | Westinghouse HW180A0G-LP Propane | GASLAND Gasmart C 5.8 GPM Indoor Propane Heater | VEVOR 4.3 Gal Propane Tankless Water Heater | Novieex 3.6 GPM Propane Tankless Water Heater |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Fuel Type | Natural Gas, Propane | Propane | Propane | Propane | Propane | Propane | Propane | Propane | Propane | Propane | Propane | Propane Gas | Propane | Propane Gas |
| Max Flow Rate | 11.1 GPM | 4.3 GPM | 4.42 GPM | Up to 4 GPM | 5.1 GPM | 6.1 GPM | 7.6 GPM | Up to 6.8 GPM | 5.3 GPM | 4.3 GPM | 7.9 GPM | 5.8 GPM | – | Up to 3.6 GPM |
| Heating Capacity | 199k BTU | 100,000 BTU | 95,000 BTU | 98,500 BTU | 120,000 BTU | 160k BTU | 199000 BTU | 140,000 BTU | – | 100,000 BTU | 180,000 BTU | 150,000 BTU | 100,000 BTU/h | 86,000 BTU |
| Installation Location | Indoor, Outdoor | Indoor | Indoor | Indoor | Indoor or Outdoor | Outdoor | Indoor | Indoor | Outdoor | Indoor | Indoor | Indoor | Indoor | Indoor |
| Voltage | – | – | 120V | 120V | – | – | – | 120V AC | – | – | 120V AC | – | – | 110V-120V AC |
| Fixture Capacity | 7 fixtures | 3-4 water points | 2–3 Fixtures | 1 shower and 1 faucet | 2–4 outlets | 5 fixtures at once | – | 4–5 Points | multiple appliances | 3-4 water outlets | 3–5 fixtures | – | – | 2-3 Point Use |
| Temperature Range | – | 95°F-155°F | 95–140°F | 90–140°F | – | – | – | 95–140°F | – | – | – | – | – | 95°F to 149°F |
| Installation Type | – | – | – | – | Whole House | – | Whole House | – | – | – | Whole House | Whole House | Whole House | – |
| Features | Tankless, Booster Pump | Tankless | Tankless | Tankless | Tankless | Tankless | Tankless | Tankless | Tankless | Tankless, Child Safety Lock, LED Display | Tankless | Tankless | Tankless | Tankless, LED Display |
| Application | – | – | – | Bathroom | – | – | – | – | – | – | – | – | – | Bathroom |
| Form Factor | – | – | – | – | – | Compact | – | – | Compact | – | – | – | – | – |
| Intended Use | – | Home | – | – | – | – | – | Home | – | – | – | – | – | – |
| Dimensions | 19 × 19 × 31 inches | 14.2 × 14.2 × 22.5 inches | 5.9 × 5.9 × 20.6 inches | 13.8 × 13.8 × 21.7 inches | 14.6 × 14.6 × 22.8 inches | 10.8 × 14.1 × 24.6 inches | 14.3 × 14.3 × 24.7 inches | 7.09 × 7.09 × 21.3 inches | 13 × 13 × 30 inches | 14.4 × 14.4 × 24.6 inches | 17.1 × 17.1 × 26.8 inches | 3.54 × 3.54 × 23.3 inches | 13.8 × 13.8 × 21.7 inches | 28.5 × 17.3 × 10.8 inches |
| Weight | 58 pounds | – | 19.2 pounds | 21.2 pounds | – | 49.2 pounds | 37.5 pounds | 26.9 pounds | 33 pounds | 25.1 pounds | – | – | 19.8 pounds | 19.8 pounds |
| Size | 11.1 GPM | 4.3GPM Indoor | – | – | – | 6.6 GPM | 7.6 GPM | – | 5.3 GPM | 4.3GPM, 100,000BTU, LPG | – | 5.8 GPM 199,000 BTU LP | 4.3 Gal | 3.6GPM Propane |
| Color | Silver | LPG | Propane Gas,4.42GPM,95,000BTU，Space Gray | Metallic Silver | White 5.1LP | Silver | Black | Space Gray | V53DeP – Propane/5.3 GPM | Non-Condensing | Grey 81LPI | White | Gray | Gray |
| Model | RXP199iN | RANEIN-43GPM-100KBTU | AP-AWH-Q13LPG | CZ360LP | FDG-CS120AW-LP | REU-VE2125WD-US-P | CE686LP | AP-AWH-Q20LPG | V53DeP | VH10K-W-LPG-U01 | HW180A0G-LP | CS528LPN2 | JSQ30-B | RS-13 |
You can compare flow rates and heating output among the best propane tankless water heaters to match your household demand.
04 How to Choose the Right One
Check installation location
Your installation site determines which units are viable. Indoor models require specific ventilation setups, while outdoor units must withstand weather. The Rinnai 11.1 GPM Condensing Tankless Water Heater is designed for outdoor use only. In contrast, the Ranein 4.3 GPM Indoor Propane Tankless Water Heater is built for interior spaces. Verify your space allows for the required clearances and venting before purchasing. Choosing the wrong location type can lead to safety hazards or installation failure. Match the unit to your available space carefully.
Match GPM to fixtures
Flow rate determines how many fixtures can run at once. A 11.1 GPM unit, like the top-ranked Rinnai model, supports seven or more simultaneous outlets. This is ideal for large families. Smaller homes with two or three fixtures may only need 4.3 GPM, such as the Ranein or VancEpic models. Higher GPM means higher gas consumption. Select the lowest flow rate that meets your peak demand to save on operating costs. Do not oversize your unit unnecessarily.
Evaluate BTU output
BTU rating indicates heating power. Higher BTU units, like the Westinghouse HW180A0G-LP at 180,000 BTU, heat water faster in colder climates. Lower BTU models, such as the APUS 95,000 BTU unit, are sufficient for moderate climates or smaller loads. Check the BTU spec to ensure the unit can raise incoming water temperature to your desired level. Insufficient BTU output results in lukewarm water during winter. Match the power rating to your local groundwater temperature.
Assess physical dimensions
Tankless heaters are compact but still require wall space. The GASLAND Gasmart C has a narrow 3.54-inch width, fitting tight spots easily. The Rinnai 11.1 GPM model is wider at 19 inches. Measure your installation area before ordering. Ensure you have enough clearance for service access and ventilation. Some models, like the VEVOR 4.3 Gal, have standard dimensions that fit most utility rooms. Verify height and length as well to avoid fitting issues during installation.
Look for smart features
Advanced features improve convenience and safety. The VancEpic 4.3 GPM Propane Tankless Heater includes a child safety lock and LED display for precise control. The MIZUDO 120,000 BTU unit offers smart control capabilities. These features allow you to monitor temperature and prevent accidental burns. Decide if you need remote monitoring or basic manual controls. Smart features often come at a premium but add significant value for families. Check the feature list to ensure the unit meets your comfort and safety requirements.
05 Frequently asked questions
What is the difference between indoor and outdoor propane tankless water heaters?
Installation location dictates the required features. Indoor units, like the Ranein 4.3 GPM model, often include ventilation kits for safe exhaust management inside your home. Outdoor units, such as the Rinnai 11.1 GPM Condensing model, are built to withstand weather elements. You must choose based on where you plan to mount the unit.
How do I determine the right GPM for my household?
Match the flow rate to your simultaneous fixture usage. Large homes with seven or more fixtures need high output like the Rinnai 11.1 GPM heater. Smaller setups with two to three fixtures can use lower output models like the APUS 95,000 BTU heater. Higher GPM ensures steady hot water during peak usage times.
Which propane water heater is best for a single bathroom?
Compact units with lower flow rates suit single-bathroom needs. The ThermoMate 4 GPM model is a practical choice for moderate hot water demands in small spaces. It provides precise temperature stability without requiring the high capacity needed for whole-house applications. This size fits well where space is limited.
Do propane tankless heaters require a gas line upgrade?
High-BTU models may require upgraded gas lines to maintain performance. The Westinghouse HW180A0G-LP delivers 180,000 BTU, which demands significant gas flow. Lower output units like the VancEpic 100,000 BTU model have less demanding requirements. You should consult a professional to verify your home’s gas capacity for high-output units.
Are there propane water heaters with smart control features?
Yes, several models offer smart control for remote management. The MIZUDO 120,000 BTU heater fits homes that value flexible installation and smart features. The Westinghouse HW180A0G-LP also includes smart control capabilities. These features allow you to adjust settings conveniently without accessing the physical unit directly.
What is the smallest propane tankless water heater by width?
The GASLAND Gasmart C 5.8 GPM model has the narrowest profile. Its width is only 3.54 inches, making it ideal for tight indoor spaces. Despite its compact size, it provides 150,000 BTU of heating power. This design prioritizes efficient space usage without sacrificing significant heating performance.
Which model includes a child safety lock?
The VancEpic 4.3 GPM Propane Tankless Heater includes a child safety lock. This feature adds an extra layer of security for households with young children. It allows for precise temperature stability while preventing accidental adjustments. The unit is designed for indoor family use with specific safety considerations in mind.
