Finding the right gas water heater 50 gallon replacement or upgrade can feel overwhelming. You want endless hot water without skyrocketing energy bills, but traditional tanks often run out during long showers. Tankless technology offers a modern solution, delivering continuous heat on demand while saving space and energy. Whether you live in a large household or want to improve efficiency, choosing the best system matters for your comfort and wallet.
Quick Product Comparison
Our Top 10 Best Gas Water Heater 50 Gallon Reviews – Expert Tested & Recommended
1. Rheem RTGH Series 8.4 GPM Indoor Natural Gas Tankless Water Heater with 157,000 BTUs Condensing Ultra-Low NOx High Efficiency
The Rheem RTGH Series stands out as a top performer for homeowners needing reliable hot water. It uses advanced condensing technology to maximize efficiency while minimizing emissions. This unit is built for indoor installation and promises durability for years of daily use.
Key Features That Stand Out
- ✓ Delivers 8.4 GPM at a 35°F rise for whole house coverage
- ✓ Features 157,000 BTUs with 0.93 Uniform Energy Factor (UEF)
- ✓ Designed for indoor installation with direct vent capability
- ✓ Ultra-low NOx emissions for environmental compliance
Why We Recommend It
We recommend this model because it offers industry-leading efficiency that lowers gas bills significantly. The condensing technology ensures you get endless hot water even during high demand periods. It is an excellent upgrade for families replacing old 50 gallon tank systems.
Best For
This heater is best for large families with multiple bathrooms who need simultaneous hot water. It suits homeowners looking for maximum energy savings and indoor installation options.
Pros and Cons
Pros:
- High energy efficiency reduces monthly utility costs
- Reliable brand reputation with strong warranty support
- Compact design saves valuable floor space
- Low emissions meet strict environmental standards
Cons:
- Higher upfront cost compared to non-condensing models
- Requires professional installation for venting
2. Rheem RTG Series 7.0 GPM Indoor Natural Gas Tankless Water Heater with 160,000 BTUs High Efficiency On Demand Continuous Hot Water Non-Condensing
The Rheem RTG Series offers a robust non-condensing option for indoor use. It provides continuous hot water without the complexity of condensing units. This model balances performance and value effectively for many households.
Key Features That Stand Out
- ✓ Delivers 7.0 GPM at 35°F temperature rise
- ✓ Powered by 160,000 BTUs for strong heating capacity
- ✓ Non-condensing design simplifies installation requirements
- ✓ 0.82 Uniform Energy Factor (UEF) for energy savings
Why We Recommend It
We choose this unit as an editor’s choice because it offers reliable performance without needing specialized venting materials. It saves up to 34% on energy costs compared to standard electric tanks. The simplicity of the non-condensing design makes it a practical choice for many retrofits.
Best For
Ideal for homeowners who want a straightforward installation process indoors. It works well for families replacing a standard gas water heater 50 gallon unit.
Pros and Cons
Pros:
- Easier installation due to non-condensing design
- High BTU output supports multiple water points
- Trusted Rheem build quality and durability
- Significant energy savings over electric tanks
Cons:
- Higher gas consumption than condensing models
- May require upgraded gas lines for optimal performance
3. GASLAND Gasmart E 199,000 BTU Natural Gas Tankless Water Heater with Up to 7.6 GPM CSA Certified Whole House Indoor Residential On-Demand Instant Hot Water CE686NG
The GASLAND Gasmart E provides a powerful budget-friendly option for whole house heating. It features a high BTU rating to ensure quick water heating on demand. This unit is CSA certified for safety and reliability in residential settings.
Key Features That Stand Out
- ✓ 199,000 BTU input for rapid heating capabilities
- ✓ Up to 7.6 GPM flow rate for multiple fixtures
- ✓ CSA certified for safety and compliance standards
- ✓ Compact suitcase-sized design fits tight spaces
Why We Recommend It
We recommend this model for budget-conscious buyers who do not want to sacrifice power. The high BTU output ensures you do not run out of hot water during busy mornings. Its compact size makes it easy to fit into closets or utility rooms.
Best For
Best for homeowners seeking a cost-effective replacement for their old tank system. It suits those with limited space who need high performance.
Pros and Cons
Pros:
- High BTU rating provides strong heating power
- Affordable price point compared to premium brands
- Space-saving design fits in small utility areas
- Unlimited hot water on demand
Cons:
- May require specific gas line upgrades
- Noise level can be higher than some competitors
4. Rheem RTG Series 7.0 GPM Outdoor Natural Gas Tankless Water Heater with 160,000 BTUs High Efficiency On Demand Continuous Hot Water Non-Condensing
The Rheem RTG Series Outdoor model is designed specifically for external installation. It frees up indoor space while providing reliable hot water to your home. This non-condensing unit is built to withstand outdoor elements.
Key Features That Stand Out
- ✓ 7.0 GPM flow rate supports whole house needs
- ✓ 160,000 BTUs ensures consistent temperature rise
- ✓ Rugged construction designed for outdoor exposure
- ✓ 0.82 Uniform Energy Factor (UEF) for efficiency
Why We Recommend It
We recommend this unit for homeowners who want to reclaim indoor storage space. Installing it outside eliminates the need for indoor venting modifications. It delivers the same reliable performance as the indoor version but with weather-resistant features.
Best For
Perfect for homes with limited indoor utility space. It is also great for those wanting to avoid indoor combustion appliance requirements.
Pros and Cons
Pros:
- Frees up valuable indoor floor space
- Durable build quality for outdoor conditions
- Reliable Rheem performance and support
- Easy to install on exterior walls
Cons:
- Exposed to weather elements despite protection
- May require additional freeze protection in cold climates
5. Ranein Natural Gas Tankless Water Heater Indoor with 8.5 GPM Flow Rate and 190,000 BTU High Efficiency On-Demand Continuous Hot Water System
The Ranein Natural Gas Tankless unit offers a high flow rate for demanding households. It features a unique fan placement for improved safety and performance. This indoor model is designed for easy assembly and use.
Key Features That Stand Out
- ✓ 8.5 GPM flow rate supports multiple simultaneous uses
- ✓ 190,000 BTU input for powerful heating
- ✓ Fans placed underneath to prevent smoke backflow
- ✓ Standard 3/4″ NPT fittings for quick installation
Why We Recommend It
We recommend this heater for its high flow rate and safety features. The fan placement ensures better ventilation safety indoors. It eliminates the wait time associated with traditional tank heaters.
Best For
Suitable for larger homes needing high flow rates. It is also good for users who prioritize safety features in indoor units.
Pros and Cons
Pros:
- High flow rate handles multiple fixtures well
- Safety-focused fan design reduces backflow risks
- Quick installation with standard fittings
- No preheating wait time required
Cons:
- Brand recognition is lower than major competitors
- May require specific ventilation considerations
6. Rheem RTG Series 8.4 GPM Outdoor Natural Gas Tankless Water Heater with 180,000 BTUs High Efficiency On Demand Continuous Hot Water Non-Condensing
The Rheem RTG Series 8.4 GPM Outdoor model provides higher flow rates for bigger homes. It operates on natural gas with a robust 180,000 BTU input. This outdoor unit is ideal for replacing larger tank systems.
Key Features That Stand Out
- ✓ 8.4 GPM at 35°F rise for high demand usage
- ✓ 180,000 BTUs for powerful heating capacity
- ✓ Non-condensing technology for straightforward venting
- ✓ Designed specifically for outdoor installation
Why We Recommend It
We recommend this model for homes that need more than 7 GPM of hot water. It effectively replaces a gas water heater 50 gallon tank in high-use scenarios. The outdoor design keeps the unit out of the way while delivering strong performance.
Best For
Best for large families with high simultaneous hot water needs. It suits homeowners who prefer outdoor installation for space saving.
Pros and Cons
Pros:
- Higher flow rate than standard 7.0 GPM models
- Saves indoor space with outdoor placement
- Reliable Rheem brand quality
- Efficient energy use compared to electric tanks
Cons:
- Higher initial investment cost
- Requires protection from freezing in winter
7. APUS Natural Gas Tankless Water Heater Indoor with 95,000 BTU and 4.42 GPM High Efficiency On-Demand Continuous Hot Water for Small Homes
The APUS Natural Gas Tankless unit is perfect for smaller living spaces. It offers precise temperature control with smart technology. This indoor heater is compact and efficient for apartments or small houses.
Key Features That Stand Out
- ✓ 95,000 BTU heating capacity for small home needs
- ✓ 4.42 GPM flow rate supports 1-2 fixtures
- ✓ Smart CPU technology maintains ±1°F temperature stability
- ✓ Oxygen-free copper heat exchangers for durability
Why We Recommend It
We recommend this for small homes or apartments where space is premium. The precise temperature control prevents scalding and ensures comfort. Its compact size allows for flexible installation in tight utility closets.
Best For
Ideal for small households or secondary heating points. It works well for users who want smart temperature regulation.
Pros and Cons
Pros:
- Compact design fits easily in small spaces
- Precise temperature control enhances safety
- Efficient copper heat exchanger construction
- Affordable option for smaller capacity needs
Cons:
- Lower flow rate not suitable for large families
- Limited simultaneous usage capacity
8. APUS Natural Gas Tankless Water Heater Indoor with 120,000 BTU and 5.43 GPM High Efficiency On-Demand Continuous Hot Water for Medium Homes
The APUS Natural Gas Tankless 120,000 BTU model bridges the gap for medium-sized homes. It supports multiple water points without breaking the bank. This unit features LED touchscreen controls for easy operation.
Key Features That Stand Out
- ✓ 120,000 BTU input supports 3-4 water points
- ✓ 5.43 GPM flow rate for medium household demand
- ✓ LED touchscreen for easy temperature selection
- ✓ 0.81 UEF efficiency rating for energy savings
Why We Recommend It
We recommend this unit for medium families upgrading from electric tanks. It offers a good balance of capacity and price. The touchscreen interface makes adjusting settings simple for any user.
Best For
Great for medium-sized families with 2-3 bathrooms. It is also suitable for those wanting a mid-range capacity indoor unit.
Pros and Cons
Pros:
- Good capacity for medium household sizes
- User-friendly LED touchscreen interface
- Energy efficient compared to traditional tanks
- Durable copper heat transfer components
Cons:
- May struggle in very cold inlet water conditions
- Brand support network smaller than major brands
9. Rheem RTG Series 7.0 GPM Outdoor Liquid Propane Tankless Water Heater with 160,000 BTUs High Efficiency On Demand Continuous Hot Water Non-Condensing
The Rheem RTG Series Propane model is designed for homes using liquid propane. It delivers the same reliable performance as the natural gas version. This outdoor unit is built for efficiency and durability.
Key Features That Stand Out
- ✓ 7.0 GPM at 35°F rise for consistent hot water
- ✓ 160,000 BTUs optimized for propane fuel
- ✓ Non-condensing design simplifies outdoor venting
- ✓ 0.82 Uniform Energy Factor (UEF) for savings
Why We Recommend It
We recommend this for propane users who want a trusted brand name. It saves energy costs compared to old propane tank heaters. The outdoor installation keeps the unit out of living spaces.
Best For
Best for rural homes or properties using propane fuel. It suits homeowners looking for outdoor propane heating solutions.
Pros and Cons
Pros:
- Reliable Rheem performance on propane fuel
- Outdoor installation saves indoor space
- Energy efficient compared to propane tanks
- Durable construction for outdoor use
Cons:
- Propane fuel costs can vary by region
- Requires adequate propane tank supply
10. APUS Propane Tankless Water Heater Indoor with 140,000 BTU and Up to 6.8 GPM High Efficiency On-Demand Continuous Hot Water System
The APUS Propane Tankless unit offers high capacity for indoor propane users. It features a built-in booster pump to increase water flow. This system eliminates cold water sandwiches for better comfort.
Key Features That Stand Out
- ✓ 140,000 BTU input for strong heating power
- ✓ Up to 6.8 GPM with built-in booster pump
- ✓ Zero cold water tech eliminates temperature fluctuations
- ✓ Supports 2 showers and 2 sinks simultaneously
Why We Recommend It
We recommend this for propane users needing higher flow rates indoors. The booster pump helps overcome low pressure issues common in older homes. It provides consistent hot water without the cold water interruptions.
Best For
Suitable for homes with low water pressure needing a boost. It works well for propane users wanting indoor installation with high capacity.
Pros and Cons
Pros:
- Built-in pump improves flow in low pressure systems
- High BTU output supports multiple fixtures
- Eliminates cold water sandwich effect
- Compact indoor design saves space
Cons:
- Pump adds complexity to the system
- Propane specific model limits fuel options
Complete Buying Guide for Best Gas Water Heater 50 Gallon
Essential Factors We Consider
When selecting a replacement for your old tank, you must consider fuel type and installation location. Natural gas models are common where pipelines exist, while propane works well for rural areas. You also need to decide between indoor and outdoor placement based on your home layout. Venting requirements differ significantly between condensing and non-condensing units.
Flow rate is another critical factor measured in gallons per minute (GPM). A gas water heater 50 gallon replacement should match your household demand. Larger families need higher GPM ratings to run multiple showers at once. Temperature rise expectations depend on your local climate and incoming water temperature.
Budget Planning
Initial costs vary widely between brands and technologies. Condensing units cost more upfront but save money on monthly gas bills over time. Non-condensing models are cheaper to buy but may use more fuel. You should also factor in installation costs which can be higher for units requiring new venting systems.
Long-term savings are important when comparing options. Energy-efficient models reduce utility bills significantly compared to old electric tanks. Look for units with high Uniform Energy Factor (UEF) ratings for the best value. Warranties also matter as they protect your investment against early failures.
Final Thoughts
Upgrading to a tankless system provides endless hot water and space savings. Whether you choose a top-rated Rheem or a budget-friendly GASLAND, ensure it meets your flow needs. Professional installation is recommended to handle gas lines and venting safely. With the right choice, you will enjoy comfort and efficiency for years.
Frequently Asked Questions
Q: Can a tankless water heater replace a 50 gallon gas tank?
A: Yes, a tankless system can replace a gas water heater 50 gallon tank effectively. You need to ensure the GPM rating matches your household demand. Most whole house units can handle multiple fixtures simultaneously without running out of hot water.
Q: What size gas water heater do I need for a family of 4?
A: For a family of 4, you typically need a unit with at least 7.0 to 8.4 GPM. This ensures enough hot water for showers and appliances running at the same time. Higher BTU ratings help maintain temperature during cold weather conditions.
Q: Is a condensing or non-condensing water heater better?
A: Condensing units are more energy-efficient and produce lower emissions. However, they require specialized venting materials which increase installation costs. Non-condensing models are simpler to install but may have higher operating costs over time.
Q: How long does a gas tankless water heater last?
A: Most quality gas tankless water heaters last between 15 to 20 years. Regular maintenance like flushing the system helps extend the lifespan. This is significantly longer than traditional tank models which often last 10 years or less.
Q: Can I install a gas water heater outdoors?
A: Yes, many models are specifically designed for outdoor installation. Outdoor units save indoor space and simplify venting requirements. Ensure the model is rated for outdoor use to withstand weather elements properly.
Conclusion
Choosing the best gas water heater 50 gallon replacement depends on your specific home needs and budget. The Rheem RTGH Series offers top efficiency for large families, while GASLAND provides a strong budget option. Consider fuel type, installation location, and flow rate before making your decision. Upgrade today to enjoy endless hot water and lower energy bills.
