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The NOVIEEX 120K BTU Propane Tankless Heater delivers up to 4.75 GPM of hot water with precise temperature control. If you are searching for novieex propane gas tankless water alternatives, you may need different flow rates or dimensions. This unit measures 16 by 17.3 inches and weighs 28.2 pounds. It suits indoor spaces where compact size matters more than maximum output.
You might want more capacity for a large family or a smaller unit for a tight closet. The selected alternatives share key specs like propane fuel and indoor installation. Some offer higher flow rates, while others provide lower BTU outputs for single-bathroom use. Each pick matches the original’s core function but adjusts the numbers to fit your specific household needs. Review the flow rates and physical dimensions to find the best fit for your space and usage patterns.
01 How these alternatives compare
Ranein 4.3 GPM Indoor Propane Tankless Water Heater
The Ranein unit offers 4.3 GPM, slightly less than the NOVIEEX’s 4.75 GPM, but maintains a strong 100,000 BTU output. It measures 14.2 by 22.5 inches, making it taller and narrower than the NOVIEEX’s 16 by 17.3 inch footprint. This shape may fit tighter vertical spaces. It uses a copper heat exchanger for durability. You should choose this if you prefer a premium build over maximum flow. It is ideal for indoor homes needing three to four simultaneous water points without demanding the highest possible volume.
APUS 95,000 BTU 4.42 GPM Indoor Propane Heater
The APUS model provides 4.42 GPM at 95,000 BTU, trading some power for a significantly smaller size. It measures only 5.9 by 20.6 inches, making it much slimmer than the NOVIEEX. It weighs 19.2 pounds, which is lighter than the NOVIEEX’s 28.2 pounds. This compact design suits small to medium households. You should pick this if you prioritize steady temperature control and space savings over high-volume flow. It is a practical indoor solution for users who do not need industrial-grade output or maximum simultaneous fixture usage.
ThermoMate 4 GPM Propane Tankless Water Heater
The ThermoMate unit delivers 4 GPM at 98,500 BTU, offering lower flow and power than the NOVIEEX. It measures 13.8 by 21.7 inches, presenting a different vertical profile. It weighs 21.2 pounds, lighter than the NOVIEEX. This model is specifically intended for bathroom use. You should choose this if you need efficient, safe indoor heating for a single bathroom. It fits users who value precision and certification over raw power. It is not suitable for high-demand homes requiring simultaneous multi-fixture hot water.
Rinnai 8.5 GPM Indoor Propane Tankless Water Heater
The Rinnai RE180iP provides 8.5 GPM, nearly double the NOVIEEX’s 4.75 GPM, with significantly higher capacity. It measures 14.1 by 27.3 inches, making it taller but narrower. It weighs 53.8 pounds, much heavier than the NOVIEEX. This unit is designed for large families needing high capacity. You should pick this if you require endless hot water for multiple simultaneous uses in a tight indoor space. It offers strong performance and durability for whole-home demands that exceed the NOVIEEX’s capabilities.
MIZUDO 10.3 GPM Propane Tankless Heater
The MIZUDO model offers 10.3 GPM, providing massive power for large households. It measures 15.9 by 24.8 inches, similar in width to the NOVIEEX but taller. It weighs 55.5 pounds, significantly heavier. This unit is intended for whole-home high-demand hot water. You should choose this if you need simultaneous hot water across many fixtures. It includes smart features for convenience. It fits busy homes where the NOVIEEX’s 4.75 GPM would be insufficient for peak usage times.
GASLAND 7.6 GPM Propane Tankless Water Heater
The GASLAND Gasmart E provides 7.6 GPM, offering strong flow for whole-house needs. It measures 14.3 by 24.7 inches, presenting a taller profile than the NOVIEEX. It weighs 37.5 pounds, heavier than the NOVIEEX. This model is designed for indoor propane setups requiring high capacity. You should pick this if you need whole-house propane heating. It fits homes with indoor setups that demand higher volume than the NOVIEEX can provide, ensuring consistent performance during peak usage.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | NOVIEEX 120K BTU Propane Tankless Heater Best overall | indoor homes needing compact propane heating | |
| 2 | Ranein 4.3 GPM Indoor Propane Tankless Water Heater Best premium | Indoor homes needing 3–4 simultaneous water points | |
| 3 | APUS 95,000 BTU 4.42 GPM Indoor Propane Heater Best budget | Indoor use with 2–3 simultaneous fixtures | |
| 4 | ThermoMate 4 GPM Propane Tankless Water Heater Best bathroom | Single bathroom indoor propane heating | |
| 5 | Rinnai 8.5 GPM Indoor Propane Tankless Water Heater Best compact | large households needing high flow | |
| 6 | MIZUDO 10.3 GPM Propane Tankless Heater Also great | whole-home high-demand hot water | |
| 7 | GASLAND 7.6 GPM Propane Tankless Water Heater Best whole house | Whole-house propane heating |
NOVIEEX 120K BTU Propane Tankless Heater
Best for: indoor homes needing compact propane heating
- Fuel Type
- Propane Gas
- Max Flow Rate
- 4.75 GPM
- Heating Capacity
- 120,000 BTU
- Installation Location
- Indoor
- Voltage
- 110V-120V AC
- Temperature Range
- 95°F to 149°F
The NOVIEEX RS16 is an indoor propane tankless water heater delivering up to 4.75 GPM with 120,000 BTU. It features a 95°F to 149°F adjustable range and a 16-inch compact design. This unit suits households needing reliable hot water for showers and sinks. Its digital thermostat ensures precise temperature control. The system includes multi-protection safety features for secure operation.
- 120,000 BTU heating capacity
- 4.75 GPM maximum flow rate
- 95°F to 149°F temperature range
- 16-inch compact wall-mounted design
- Digital thermostat with ±1°F control
- 4.75 GPM flow rate is lower than the 10.3 GPM MIZUDO option
- 120,000 BTU capacity is less than the 199,000 BTU MIZUDO unit
- Weight of 28.2 pounds is heavier than the 20-pound Ranein model
- You need a compact indoor propane heater
- You want precise digital temperature control
- You require a 120,000 BTU heating capacity
- You need more than 4.75 GPM flow
- You require outdoor installation
- You prefer a lighter unit under 25 pounds
Verdict: NOVIEEX 120K BTU Propane Tankless Heater provides balanced performance for indoor use. It fits homes prioritizing compact size and steady temperature over maximum flow rates.
Ranein 4.3 GPM Indoor Propane Tankless Water Heater
Best for: Indoor homes needing 3–4 simultaneous water points
- 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 propane tankless water heater delivers up to 4.3 GPM for indoor use. It supports 3–4 simultaneous water points, making it suitable for whole-home needs. The unit features an oxygen-free copper heat exchanger for efficient heating. You get precise temperature control between 95°F and 155°F with four preset modes. It includes anti-freeze protection down to 14°F and comes with a vent pipe for installation.
- 100,000 BTU heating capacity for reliable hot water
- 4.3 GPM max flow rate supports 3–4 fixtures
- Oxygen-free copper heat exchanger for durability
- Four intelligent preset modes for different needs
- Anti-freeze protection down to 14°F
- 4.3 GPM flow rate is lower than the Rinnai 8.5 GPM and MIZUDO 10.3 GPM options
- 100,000 BTU output is less powerful than the MIZUDO 199,000 BTU model
- Indoor-only installation limits placement flexibility
- You need a reliable indoor propane heater for 3–4 water points
- You want precise temperature control with preset modes
- You require anti-freeze protection for colder climates
- You need a flow rate higher than 4.3 GPM
- You require outdoor installation capabilities
- You want the highest possible BTU output available
Verdict: Ranein 4.3 GPM Propane Tankless Heater offers solid performance for standard household needs with its 100,000 BTU output and copper heat exchanger. It fits well in homes where indoor propane heating is required and flow rates above 4.3 GPM are not essential.
APUS 95,000 BTU 4.42 GPM Indoor Propane Heater
Best for: Indoor use with 2–3 simultaneous 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 and up to 4.42 GPM for indoor use. It features an LED touchscreen and precise temperature control within ±1°F. This unit supports 2–3 fixtures simultaneously. You get 98% thermal efficiency and built-in freeze protection. It is a compact, space-saving option for households needing steady hot water without large storage tanks.
- 95,000 BTU heating capacity
- 4.42 GPM max flow rate
- Precise ±1°F temperature control
- 98% thermal efficiency rating
- LED touchscreen interface
- Lower 95,000 BTU output than the 120,000 BTU and 199,000 BTU competitors
- Lower 4.42 GPM flow rate compared to the 7.6 GPM and 8.5 GPM models
- Shorter 2-year warranty than the industry standard 6-year or 12-year options
- You need a compact unit for 2–3 fixtures
- You want precise temperature stability within ±1°F
- You require a propane heater with freeze protection
- You need high flow rates above 5 GPM
- You require a condensing unit for maximum efficiency
- You want a warranty longer than 2 years
Verdict: APUS 95K BTU Propane Tankless Heater suits small to medium households prioritizing steady temperature control and compact sizing over high-volume flow. It is a practical indoor solution for users who do not need industrial-grade output.
ThermoMate 4 GPM Propane Tankless Water Heater
Best for: Single bathroom indoor propane heating
- 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 98,500 BTU propane tankless water heater delivers up to 4 GPM of hot water for indoor use. Its copper heat exchanger achieves 98% thermal efficiency and a UEF of 0.81. Precise sensors maintain temperature stability within ±1°F. The compact 21.2-inch height fits tight spaces. CSA certification ensures safety for residential bathroom applications.
- 98,500 BTU heating capacity for reliable hot water
- Up to 4 GPM flow rate for single shower use
- 98% thermal efficiency with copper heat exchanger
- Temperature stability within ±1°F via advanced sensors
- CSA certified with multiple safety protections
- Lower 4 GPM flow rate compared to competitors reaching 8.5 or 10.3 GPM
- 98,500 BTU heating capacity is lower than other options offering 100,000 to 199,000 BTU
- Heavier 21.2-pound build compared to lighter tankless units
- You need a CSA-certified unit for indoor bathroom installation
- You prioritize high thermal efficiency and precise temperature control
- You require a compact heater for tight spaces under 22 inches tall
- You need high flow rates above 4 GPM for multiple fixtures
- You require higher heating power than 98,500 BTU
- You are looking for a lightweight portable solution
Verdict: ThermoMate 98,500 BTU Propane Tankless suits single-bathroom households needing efficient, safe indoor heating. Its lower flow and BTU specs limit it for high-demand homes. It fits users valuing precision and certification over raw power.
Rinnai 8.5 GPM Indoor Propane Tankless Water Heater
Best for: large households needing high flow
- Fuel Type
- Propane
- Max Flow Rate
- 8.5 GPM
- Heating Capacity
- 180k BTU
- Installation Location
- Indoor
- Fixture Capacity
- 7 fixtures at once
- Features
- Tankless
The Rinnai RE180iP is a compact indoor propane tankless water heater delivering up to 8.5 GPM with 180,000 BTU of heating capacity. Its small footprint fits tight spaces while supporting seven simultaneous fixtures. This unit suits large households needing high flow rates. It includes a durable heat exchanger and clear LED diagnostics. Professional installation is required for safe operation.
- High 8.5 GPM flow rate for multiple fixtures
- Compact dimensions fit small indoor spaces
- 180,000 BTU heating capacity
- 15-year heat exchanger warranty
- Heavier at 53.8 pounds than lighter competitors
- Indoor installation only, not suitable for outdoor use
- Requires professional installation, increasing setup complexity
- You need high flow for seven fixtures
- You have limited indoor space
- You want a durable propane unit
- You need outdoor installation
- You prefer DIY setup
- You require lower flow rates
Verdict: Rinnai RE180iP 8.5 GPM Propane delivers strong performance for large families. It fits tight indoor spaces while providing endless hot water. Choose this if you need high capacity and durability.
MIZUDO 10.3 GPM Propane Tankless Heater
Best for: whole-home high-demand hot water
- Fuel Type
- Propane Gas
- Max Flow Rate
- 10.3 GPM
- Heating Capacity
- 199,000 BTU
- Installation Location
- Indoor
- Voltage
- 120V
- Fixture Capacity
- 5-7 Outlets
This MIZUDO propane tankless water heater delivers 199,000 BTU and up to 10.3 GPM. It supports 5-7 outlets, making it suitable for whole-home use. The unit features ±1°F temperature precision and smart WiFi control. It draws outdoor air for combustion, ensuring safe indoor installation. The compact design fits in closets or basements. You get reliable hot water for multiple fixtures simultaneously.
- 199,000 BTU heating capacity
- 10.3 GPM max flow rate
- ±1°F precise temperature control
- Smart WiFi and Alexa support
- Outdoor air combustion system
- Heavier at 55.5 pounds
- Limited to indoor installation only
- Not recommended above 3,000 feet elevation
- You need high flow for multiple bathrooms
- You want smart app control
- You have an indoor venting option
- You live above 3,000 feet elevation
- You require outdoor installation
- You need a lighter unit for easy mounting
Verdict: MIZUDO 10.3 GPM Propane Heater offers massive power for large households. It fits busy homes needing simultaneous hot water across many fixtures. The smart features add convenience for tech-savvy users.
GASLAND 7.6 GPM Propane Tankless Water Heater
Best for: Whole-house propane heating
- Fuel Type
- Propane
- Max Flow Rate
- 7.6 GPM
- Heating Capacity
- 199000 BTU
- Installation Location
- Indoor
- Installation Type
- Whole House
- Features
- Tankless
This indoor propane tankless water heater delivers up to 7.6 GPM with 199,000 BTU of heating capacity. It features a compact design measuring 14.3 by 24.7 inches and weighs 37.5 pounds. The unit is CSA certified and built for whole-house use. You get continuous hot water without a storage tank. It offers a high energy efficiency rating of 0.8 UEF. This model suits homes needing strong flow rates for multiple fixtures.
- Max flow rate of 7.6 GPM for whole-house coverage
- 199,000 BTU heating capacity for consistent performance
- CSA certified for indoor safety and reliability
- Compact dimensions of 14.3 by 24.7 inches
- Heavier build at 37.5 pounds compared to lighter units
- Indoor installation only, requiring proper venting
- Propane fuel type limits outdoor use options
- You need a high flow rate for multiple bathrooms
- You have an indoor space for wall mounting
- You want a CSA certified unit for safety
- You require outdoor installation capabilities
- You prefer natural gas over propane
- You need a lighter unit for easy handling
Verdict: GASLAND Gasmart E 7.6 GPM Propane provides strong flow for whole-house needs. It fits homes with indoor propane setups requiring high capacity.
02 Specifications side by side
| Spec | NOVIEEX 120K BTU Propane Tankless 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 | Rinnai 8.5 GPM Indoor Propane Tankless Water Heater | MIZUDO 10.3 GPM Propane Tankless Heater | GASLAND 7.6 GPM Propane Tankless Water Heater |
|---|---|---|---|---|---|---|---|
| Fuel Type | Propane Gas | Propane | Propane | Propane | Propane | Propane Gas | Propane |
| Max Flow Rate | 4.75 GPM | 4.3 GPM | 4.42 GPM | Up to 4 GPM | 8.5 GPM | 10.3 GPM | 7.6 GPM |
| Heating Capacity | 120,000 BTU | 100,000 BTU | 95,000 BTU | 98,500 BTU | 180k BTU | 199,000 BTU | 199000 BTU |
| Installation Location | Indoor | Indoor | Indoor | Indoor | Indoor | Indoor | Indoor |
| Voltage | 110V-120V AC | – | 120V | 120V | – | 120V | – |
| Fixture Capacity | – | 3-4 water points | 2–3 Fixtures | 1 shower and 1 faucet | 7 fixtures at once | 5-7 Outlets | – |
| Temperature Range | 95°F to 149°F | 95°F-155°F | 95–140°F | 90–140°F | – | 95-149°F | – |
| Installation Type | – | – | – | – | – | – | Whole House |
| Features | Tankless | Tankless | Tankless | Tankless | Tankless | Tankless | Tankless |
| Application | – | – | – | Bathroom | – | – | – |
| Form Factor | – | – | – | – | Compact | – | – |
| Intended Use | – | Home | – | – | – | Home | – |
| Dimensions | 16 × 16 × 17.3 inches | 14.2 × 14.2 × 22.5 inches | 5.9 × 5.9 × 20.6 inches | 13.8 × 13.8 × 21.7 inches | 10.8 × 14.1 × 27.3 inches | 15.9 × 15.9 × 24.8 inches | 14.3 × 14.3 × 24.7 inches |
| Weight | 28.2 pounds | – | 19.2 pounds | 21.2 pounds | 53.8 pounds | 55.5 pounds | 37.5 pounds |
| Color | Gray | LPG | Propane Gas,4.42GPM,95,000BTU，Space Gray | Metallic Silver | Silver | Grey 10.3LP | Black |
| Model | RS16 | RANEIN-43GPM-100KBTU | AP-AWH-Q13LPG | CZ360LP | REU-VE2432FFD-US-P | WCIU-HW199A1G-LP-M1n | CE686LP |
| Size | – | 4.3GPM Indoor | – | – | 8.5 GPM | – | 7.6 GPM |
03 Frequently asked questions
Which propane tankless water heater is best for small indoor spaces?
The APUS 95,000 BTU model is a strong choice for tight areas. It measures just 5.9 by 20.6 inches and weighs only 19.2 pounds. Its compact footprint allows it to fit in small utility closets or corners where larger units cannot go. This makes it ideal for apartments or homes with limited installation space.
How do flow rates compare across these NOVIEEX alternatives?
Flow rates vary significantly from 4 GPM to 10.3 GPM. The ThermoMate model provides 4 GPM, suitable for a single bathroom. The MIZUDO unit delivers 10.3 GPM, supporting whole-home usage. The NOVIEEX and Ranein models sit in the middle at 4.75 GPM and 4.3 GPM respectively, balancing capacity with space efficiency.
What is the smallest footprint among these propane heaters?
The APUS heater has the narrowest profile, measuring 5.9 inches in width and length. This square base allows it to occupy minimal floor space compared to wider units like the NOVIEEX, which is 16 inches wide. Its small dimensions make it the most space-efficient option for narrow alcoves or tight indoor installations.
Which unit is best for a large household with high demand?
The MIZUDO 10.3 GPM model is designed for high-demand households. It provides the highest flow rate in this group, supporting multiple simultaneous fixtures. The Rinnai 8.5 GPM unit is another strong option for large families. Both units offer substantial capacity to ensure consistent hot water supply during peak usage times.
Are all these heaters suitable for indoor installation?
Yes, all listed models are rated for indoor installation. They include specific features for indoor safety and efficiency. The ThermoMate model is explicitly noted for bathroom use, while others like the Rinnai and GASLAND are designed for whole-house indoor setups. Always verify local codes, but all products in this list support indoor environments.
How heavy are the heaviest propane tankless water heaters?
The heaviest units are the Rinnai and MIZUDO models. The Rinnai weighs 53.8 pounds, while the MIZUDO weighs 55.5 pounds. These weights reflect their robust construction and higher capacity components. You will need adequate floor support for these units, unlike lighter models like the APUS, which weighs only 19.2 pounds.
Which heater offers the highest BTU output?
The NOVIEEX model offers 120,000 BTU, the highest in this group. The Ranein follows with 100,000 BTU, and the APUS provides 95,000 BTU. Higher BTU ratings generally support faster heating and higher flow rates. Choose the NOVIEEX if you prioritize maximum heating power for your indoor propane setup.
