The best hot water heater gas options provide reliable and efficient hot water for households of all sizes, ensuring comfort and convenience. When selecting a new unit, consider factors like tank capacity, energy efficiency ratings, and venting requirements, as these can significantly impact performance and operating costs. A poorly chosen water heater might struggle to keep up with demand, leading to lukewarm showers, or operate inefficiently, driving up energy bills.
Future-proofing your investment with advanced features can also offer long-term benefits. To help you navigate the market, we’ve curated a list of the top 10 best hot water heater gas models available, designed to meet diverse needs and household demands.
For those seeking the best hot water heater gas, models like the Rinnai RX199iN Condensing Smart Sense offer versatility with indoor/outdoor installation and dual-fuel capability (natural gas or propane). Rheem provides high-efficiency options such as the RTG-70DVLN-3 for indoor use, delivering up to 7.0 GPM, powered by 160,000 BTUs; outdoor variants like the RTG-70XLN-3 are also available.
Best Hot Water Heater Gas: Top Picks
| Image | Product | Buy |
|---|---|---|
Best Pick 1  | NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Best for: Smart home integration | Check Price |
Best Pick 2  | Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water Best for: Basic indoor needs | Check Price |
Best Pick 3  | Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water Best for: Outdoor installation | Check Price |
Best Pick 4  | Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120 Best for: High-volume homes | Check Price |
Best Pick 5  | Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water Best for: Propane outdoor use | Check Price |
How We Picked
Our selection process for the best hot water heater gas focused on tangible benefits for homeowners. We prioritized build quality and durability, examining materials and construction for long-term reliability. Real-world performance was assessed by flow rates and heating capacity, ensuring consistent hot water delivery for multiple demands.
Safety features, a non-negotiable, were rigorously checked, as was the inclusion of standout features like smart controls and versatile installation options, as seen in the Rinnai RX199iN. We ruled out models lacking robust warranties or clear indications of lasting performance.
What Most Buyers Get Wrong
Gas Type Matters: NG vs. Propane
Choosing between natural gas (NG) and propane for your tankless water heater isn’t just a preference; it’s a critical compatibility decision. Natural gas lines are common in many homes, offering a continuous supply. Propane, however, requires a tank and regular refills, making it ideal for off-grid locations.
Models like the Rinnai RX199iN are designed for both, offering flexibility, while others are specific. Always verify your available gas supply before purchasing to avoid costly installation changes.
BTU: Fueling Your Hot Water Demand
BTU (British Thermal Units) directly indicates a gas water heater’s heating power. Higher BTU means more hot water faster, crucial for busy households. For example, the APUS 190,000 BTU unit and the Rinnai RE199iN both boast high BTU, suitable for multiple simultaneous hot water uses.
A 7.0 GPM heater for 2-3 bathrooms, like several Rheem models, will typically need around 160,000 BTUs. Match this spec to your home’s peak demand to ensure you never run out of hot water.
1. NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane
Best for: Best for whole-home, flexible fuel.
This Rinnai RX199iN offers year-round indoor or outdoor installation flexibility with its Versa Vent, powered by either natural gas or propane via the Smart Sense gas control system.
This compact, suitcase-sized tankless unit delivers an impressive 11.1 GPM flow rate, capable of simultaneously supplying up to 7 fixtures. Its 199,000 BTU heat output ensures robust performance in demanding conditions.
Pros
- Up to 11.1 GPM flow rate covers multiple fixtures
- Smart Sense gas control system for fuel adaptability
- Versa Vent for indoor/outdoor installation
- 199,000 BTU heat output for strong performance
Cons
- Requires separate RX-OVC vent cap for outdoor use
Ideal for larger homes needing ample hot water and flexible installation options. This unit suits homeowners who want to ensure consistent hot water supply regardless of fuel source or location.
2. Rheem RTG-70DVLN-3 High Efficiency Non-Condensing Indoor Tankless Natural Gas Water
Best for: Best for 2-3 bathroom homes, indoor use.
Delivering up to 7.0 GPM, this Rheem RTG-70DVLN-3 is perfectly suited for 2–3 bathroom homes with demand from showers and laundry operating simultaneously.
Powered by natural gas with a 160,000 BTU heat output, this unit ensures rapid and consistent hot water supply during peak household usage. Its durable, compact metal cabinet is designed for easy wall mounting.
Pros
- 7.0 GPM flow rate for multiple simultaneous uses
- 160,000 BTU heat output for strong performance
- Hot-start programming for faster hot water delivery
- Integrated Digital Display for easy monitoring
Cons
- Designed for indoor installation only
This Rheem water heater is for homeowners with 2-3 bathrooms seeking reliable hot water for daily needs like showers and appliances. It offers a durable, indoor solution for consistent on-demand heating.
3. Rheem RTG-70XLN-3 High Efficiency Non-Condensing Outdoor Tankless Natural Gas Water
Best for: Best for outdoor installation, 2-3 bathrooms.
Designed specifically for outdoor installation, this Rheem RTG-70XLN-3 offers a robust 7.0 GPM flow rate, ideal for 2–3 bathroom homes with simultaneous hot water demands.
Fueled by natural gas and boasting a 160,000 BTU heat output, this unit provides fast and dependable hot water delivery even during peak usage. Its durable metal cabinet ensures longevity in outdoor environments.
Pros
- 7.0 GPM flow rate for multiple simultaneous uses
- 160,000 BTU heat output for strong performance
- Outdoor installation capability
- Freeze protection for colder climates
Cons
- Requires outdoor installation
This is the ideal tankless water heater for homeowners needing a robust outdoor solution. It reliably serves 2-3 bathrooms, ensuring hot water availability for showers and appliances without interruption.
4. Rheem RRTGH84DVLN3701171 Rheem RTGH Series 8.4 GPM 157,000 BTU 120
Best for: Best for high flow needs, mid-range homes.
Achieving a flow rate of 8.4 GPM, this Rheem RTGH Series unit is engineered to meet the demands of multiple hot water outlets operating concurrently in a busy household.
With a 157,000 BTU heat output, this tankless water heater provides consistent hot water across a temperature range of 100 to 140°F. It features exclusive Hot Start Programming for quicker hot water delivery.
Pros
- 8.4 GPM flow rate supports multiple simultaneous uses
- 157,000 BTU heat output for ample hot water
- Exclusive Hot Start Programming
- Electric ignition for efficient operation
Cons
- Limited to 140°F maximum temperature
This Rheem tankless water heater is best suited for mid-range homes that experience concurrent hot water usage. Its higher flow rate ensures satisfaction for families with multiple showers and appliances.
5. Rheem RTG-70XLP-3 High Efficiency Non-Condensing Outdoor Tankless Liquid Propane Water
Best for: Best for outdoor propane use, 2-3 bathrooms.
Powered by liquid propane, this Rheem RTG-70XLP-3 delivers a strong 7.0 GPM flow rate, perfectly suited for 2–3 bathroom homes with consistent hot water needs.
This unit features 160,000 BTUs of heating power, ensuring fast and reliable hot water delivery even when multiple fixtures are in use. Its compact and lightweight design supports easy wall mounting for outdoor installations.
Pros
- 7.0 GPM flow rate for multiple simultaneous uses
- 160,000 BTU heat output for strong performance
- Liquid propane powered for specific fuel needs
- Designed for outdoor installation
Cons
- Only compatible with liquid propane fuel
This Rheem tankless water heater is tailored for homes that utilize liquid propane and require outdoor installation. It reliably serves 2-3 bathrooms, providing on-demand hot water for daily activities.
6. Rheem 240V Heating Chamber RTEX-13 Residential Tankless Water Heater, GRAY
Best for: Best electric tankless for small spaces.
This Rheem RTEX-13 is a compact, 13kW electric tankless water heater designed for efficient, on-demand hot water with minimal space requirements.
Featuring durable copper immersion heating elements and a self-modulating power control, it offers 99.8% energy efficiency. The external digital thermostatic control allows for precise temperature adjustments in 1°F increments.
Pros
- 99.8% energy efficient operation
- External digital thermostatic control for precise temp
- Compact wall-mounted design saves space
- Durable copper heating elements
Cons
- Requires 240V electrical connection
This electric tankless water heater is ideal for smaller homes or specific point-of-use applications where electric power is preferred. Its efficiency and compact size make it a practical choice for consistent hot water.
7. Rinnai RE199iN Non-Condensing Natural Gas Tankless Water Heater, 199,000 BTU,
Best for: Best for high demand, natural gas indoors.
The Rinnai RE199iN non-condensing natural gas tankless water heater delivers a powerful 199,000 BTU output for endless hot water on demand.
Capable of up to 9.8 GPM, this unit efficiently heats water only when needed, reducing standby energy loss. Its compact, wall-mounted design includes an LED display with diagnostic codes for simpler maintenance.
Pros
- Up to 9.8 GPM flow rate for high demand
- 199,000 BTU heat output for ample hot water
- Energy efficient on-demand performance
- Compact, space-saving wall-mounted design
Cons
- Primarily designed for natural gas
This Rinnai unit is perfect for larger homes or households with high hot water demands using natural gas. It offers efficient, continuous hot water supply with easily accessible diagnostic information.
8. ThermoMate CZ422NG Natural Gas Tankless Water Heater, Up to 5
Best for: Best for simultaneous showers, natural gas.
The ThermoMate CZ422NG natural gas tankless water heater provides up to 5 GPM and 113,000 BTU, capable of supplying two showers simultaneously with stable temperature.
Its smart flow sensor and control chip adjust heating 20,000 times per second for ±1°F temperature consistency, ensuring no cold-water interruptions. This unit integrates 8 safety protections for reliable operation.
Pros
- 5 GPM flow rate for two simultaneous showers
- ±1°F temperature consistency
- 113,000 BTU heat output
- Integrated safety protections (anti-freezing, dry combustion)
Cons
- Lower flow rate may not serve more than two high-demand fixtures
This ThermoMate water heater is well-suited for homes needing reliable hot water for two simultaneous showers. Its precise temperature control makes it a good choice for consistent comfort, especially with natural gas.
9. APUS 190,000 BTU Outdoor Tankless Water Heater, 8.1 GPM Natural
Best for: Best for whole-home, smart control, natural gas.
This APUS 190,000 BTU outdoor tankless water heater provides a substantial 8.1 GPM of instant hot water, ideal for whole-house use.
With advanced heat exchanger technology and a low minimum flow rate of 0.79 GPM, it reliably supplies hot water to 3 showers and 2 faucets simultaneously. Smart seasonal technology optimizes performance and efficiency.
Pros
- 8.1 GPM flow rate for whole-house coverage
- 190,000 BTU heat output
- APP control and remote adjustment
- Low water pressure startup capability
Cons
- Designed for outdoor installation only
This APUS tankless water heater is an excellent choice for homeowners seeking whole-home hot water with smart features. Its high flow rate and app control make it a modern solution for busy households.
10. Rheem RTG-70DVLP-3 High Efficiency Non-Condensing Indoor Tankless Liquid Propane Water
Best for: Best for 2-3 bathrooms, outdoor propane.
This Rheem RTG-70DVLP-3 outdoor tankless water heater, powered by liquid propane, delivers up to 7.0 GPM, perfectly handling the needs of 2–3 bathroom homes.
With 160,000 BTUs, this unit ensures fast, reliable hot water, even during peak demand. Its durable metal cabinet is designed for outdoor installation and ease of wall mounting by a qualified professional.
Pros
- 7.0 GPM flow rate for multiple simultaneous uses
- 160,000 BTU heat output for strong performance
- Liquid propane powered for specific fuel needs
- Durable metal cabinet for outdoor use
Cons
- Efficiency rating of 0.82 is lower than some condensing models
This Rheem tankless water heater is ideal for homes requiring an outdoor, liquid propane solution for serving 2-3 bathrooms. It offers consistent hot water delivery for daily activities and appliances.
Propane vs. Natural Gas: The Deciding Factor
The primary decision point when selecting a best hot water heater gas unit will invariably come down to fuel availability and your home’s infrastructure, not the flow rate or BTU output alone.
For most households, the choice is already made before even looking at options like the Rheem RTG-70DVLN-3 or the Rinnai RE199iN Natural Gas Tankless Water Heater. If your home is connected to a municipal natural gas line, leveraging that is almost always the more cost-effective and convenient path. Units designed for natural gas, such as the ThermoMate CZ422NG Natural Gas Tankless Water Heater, tap into this existing supply, eliminating the need for external storage and delivery logistics.
However, if natural gas is not an option for your property, then liquid propane becomes your sole focus, albeit with its own set of considerations. Propane models, like the Rheem RTG-70XLP-3 or the Rheem RTG-70DVLP-3, require an on-site propane tank. While these tanks can be rented or purchased, they necessitate periodic refilling, a service that adds an ongoing operational cost and potential inconvenience.
The APUS 190,000 BTU Outdoor Tankless Water Heater, for instance, is powerful but still tethered to the propane supply chain if not already on a natural gas line.
While specifications like the 8.4 GPM flow rate on the Rheem RRTGH84DVLN3701171 are impressive and indicate a unit’s capacity for high demand, this metric is largely irrelevant if the fuel source required to achieve that performance isn’t readily available or practical for your situation. Similarly, the Condensing Smart Sense technology on the NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane offers flexibility in installation and fuel type, but the fundamental decision between propane and natural gas remains paramount. Unless you’re specifically looking to install a system that can run on either, like the Rinnai RX199iN which boasts both Versa Vent and Smart Sense gas control, your existing utility hookups should dictate your initial search parameters.
Ultimately, if your home has access to natural gas, that should be your default selection, making units like the Rheem RTG-70DVLN-3 the most straightforward and often most economical choice.
How to Choose the Best Hot Water Heater Gas
Tank capacity and flow rate
For a gas hot water heater, tank capacity is paramount for meeting demand. Choose a 40-gallon tank if your household consistently uses less than 35 gallons per day; step up to a 50-gallon tank for moderate usage up to 50 gallons daily. Larger families or homes with high-demand appliances will benefit from a 75-gallon tank.
Pay close attention to the Gallons Per Minute (GPM) rating, aiming for at least 3.5 GPM for simultaneous showers and faucet use. A strong recovery rate, indicated by Gallons Per Hour (GPH), ensures hot water is replenished swiftly, so look for over 60 GPH for consistent performance.
For most families, a 50-gallon tank with a 4.0 GPM rating is the decisive pick.
Energy efficiency and fuel source
Energy efficiency dictates long-term operating costs. Prioritize a high Energy Factor (EF) rating, with 0.62 or higher indicating excellent efficiency for standard tanks. Condensing gas heaters achieve even higher EF ratings, up to 0.95, but require more upfront investment.
Natural gas is typically cheaper to operate than propane, so select natural gas if available. Venting is critical for safety; direct-vent models pull combustion air from outside and vent exhaust outdoors, making them ideal for installation in closets or smaller spaces.
Gravity-vent systems need ample vertical space. Choose a direct-vent, high-EF model for optimal efficiency and installation flexibility.
Dimensions and installation space
The physical dimensions of a gas water heater are crucial for seamless integration. Standard 40-50 gallon tanks typically stand around 50-60 inches tall with a 20-24 inch diameter. Always check the manufacturer’s specifications for required clearances: 1-3 inches around the unit is standard, but venting may necessitate more space.
For installation, a basement or garage offers the most flexibility due to space and seismic strapping requirements. A dedicated utility closet is also suitable for smaller, direct-vent units.
Select a unit whose footprint and height allow for at least 12 inches of clearance above and to the sides for maintenance. A standard 20-inch diameter model is the most adaptable choice.
Which Should You Choose?
- If you need to install your water heater indoors or outdoors and want flexibility with fuel sources, choose a model with a versatile venting system and a Smart Sense gas control system that can operate on either natural gas or propane.
- If you have multiple hot water needs in a 2-3 bathroom home and your water heater will be installed outside, choose a high-efficiency non-condensing model with a flow rate of up to 7.0 GPM designed for outdoor use.
- If you have a larger home requiring a high hot water flow rate for multiple simultaneous uses, choose a tankless model with a GPM of 8.0 or higher, capable of providing consistent hot water at your desired temperature.
- If you have limited space and want an energy-efficient solution that heats water only when needed, choose a non-condensing tankless natural gas water heater with a compact design.
Quick Best Hot Water Heater Gas Buying Checklist
- Verify Fuel Type Ensure compatibility with natural gas or propane.
- Determine Tank Size Match gallon capacity to household demand and occupancy.
- Check Energy Factor (EF) Look for higher EF ratings for better efficiency.
- Measure Installation Space Confirm physical dimensions and clearance requirements.
- Consider Venting Method Understand direct vent, power vent, or atmospheric vent needs.
- Review Warranty Terms Check manufacturer’s warranty for peace of mind.
Frequently Asked Questions
What Is The Typical Lifespan For A Gas Water Heater?
Most gas water heaters are designed to last between 10 to 15 years, depending on usage and maintenance. Regular flushing of the tank and anode rod replacement can help extend its operational life significantly.
How Do I Select The Right Tank Size For My Home?
Selecting the right tank size for your gas water heater involves considering your household’s peak demand. A common recommendation is a 40-50 gallon tank for a family of 3-4, but larger households may need 75 gallons or more.
What Does Energy Factor (Ef) Mean For Gas Water Heaters?
The Energy Factor (EF) on a gas water heater indicates its overall efficiency in converting fuel to usable hot water. Higher EF ratings signify that more energy is used to heat water than is lost through the tank and pipes.
What Are The Venting Options For A Gas Water Heater?
Venting options for gas water heaters typically include direct vent, power vent, and atmospheric vent systems. Direct vent models use outside air for combustion and exhaust, making them suitable for various installation locations.
Is A Pilot Light Or Electronic Ignition Better For Gas Water Heaters?
Gas water heaters with electronic ignition are generally more energy-efficient than those with a standing pilot light. They only use gas when hot water is needed, reducing continuous fuel consumption and operational costs.
Final Words
Investing in the best hot water heater gas ensures consistent hot water and can significantly impact your home’s comfort and efficiency. These reliable units provide excellent value, delivering the hot water you need for daily tasks. Upgrade your home’s performance and enjoy uninterrupted hot water by choosing a top-rated gas water heater.