5 Best Gas Tankless Water Heater for Small Home [In 2025]

When it comes to providing hot water for a small home, a gas tankless water heater can be an excellent choice. Offering endless hot water on demand, improved energy efficiency, and a compact design, these units can be a game-changer for homeowners looking to upgrade their water heating system. In this comprehensive review, we’ll explore some of the best gas tankless water heaters for small homes, analyzing their features, benefits, and customer feedback to help you make an informed decision.

Natural Gas Tankless Water Heater – ORBEK 120,000 BTU Up to 5.1 GPM Outdoor Installation

Overview

The ORBEK 120,000 BTU outdoor tankless water heater is designed to provide endless hot water for small to medium-sized homes. With a maximum flow rate of 5.1 GPM and a heating capacity of 120,000 BTU, this unit can serve multiple fixtures simultaneously, ensuring a consistent and comfortable hot water supply.

Specs

• Heating Capacity: 120,000 BTU
• Flow Rate: Up to 5.1 GPM
• Fuel Type: Natural Gas
• Dimensions: 15.5″L x 7.3″W x 24.0″H
• Connector Size: 3/4″ NPT

Pros

• Endless hot water on demand
• Designed for outdoor installation with weather-resistant features
• CSA certified with advanced safety features
• Energy-efficient design with multiple heating modes
• Stable temperature control with remote control and digital display

Cons

• Professional installation recommended for optimal performance and safety
• May not be suitable for large homes with high hot water demand

Customer Review

The ORBEK outdoor tankless water heater has received positive feedback from customers, with many praising its reliable performance, energy-efficient features, and easy installation. However, some customers have noted that professional installation is recommended for best results.

GASLAND Gasmart E Propane Tankless Gas Water Heater

Overview

The GASLAND Gasmart E is a compact, wall-mounted propane tankless water heater that provides unlimited hot water on demand. With a maximum flow rate of 3.8 GPM and a heating capacity of 98,000 BTU, this unit is well-suited for small to medium-sized homes.

Specs

• Heating Capacity: 98,000 BTU
• Flow Rate: Up to 3.8 GPM
• Fuel Type: Propane
• Dimensions: Suitcase-sized design
• Connector Size: 3/4″ NPT

Pros

• Provides unlimited hot water on demand
• Highly energy-efficient with a UEF of 0.8
• Compact, space-saving design
• Durable and reliable construction with built-in safety features
• Backed by a comprehensive warranty and U.S.-based customer support

Cons

• May not be suitable for larger homes with high hot water demand
• Requires propane fuel, which may not be available in all areas

Customer Review

The GASLAND Gasmart E has received positive reviews from customers, who appreciate its energy-efficient performance, easy installation, and responsive customer support. Some customers have reported issues with shipping damage, but the company has been responsive in addressing these concerns.

A. O. Smith Tankless Water Heater Gas – ProLine XE Concentric Vent

Overview

The A. O. Smith ProLine XE is a high-performance, non-condensing natural gas tankless water heater designed for indoor installation. With a maximum flow rate of 8 GPM and a heating capacity of 190,000 BTU, this unit can easily meet the hot water needs of small to medium-sized homes.

Specs

• Heating Capacity: 190,000 BTU
• Flow Rate: Up to 8 GPM
• Fuel Type: Natural Gas
• Dimensions: Wall-mounted design
• Connector Size: 3/4″ NPT

Pros

• Delivers continuous hot water with a maximum flow rate of 8 GPM
• Highly energy-efficient with a UEF of up to 0.81
• Equipped with X3 scale prevention technology for long-lasting performance
• Stable water temperatures thanks to the commercial-grade copper heat exchanger
• Comprehensive safety features, including overheat and temperature controls

Cons

• Requires professional installation for proper setup and safety
• May be overkill for smaller homes with lower hot water demands

Customer Review

The A. O. Smith ProLine XE tankless water heater has not received any customer reviews on the Amazon listing, as it is a newer model. However, the brand is well-known for its quality and reliability in the water heating industry.

Natural Gas Tankless Water Heater, Indoor Max 3.6 GPM, 80,000 BTU Instant Hot Water Heater

Overview

This natural gas tankless water heater from Ranein offers a budget-friendly option for small homes. With a heating capacity of 80,000 BTU and a maximum flow rate of 3.6 GPM, it can provide continuous hot water for 2-3 water supply points simultaneously.

Specs

• Heating Capacity: 80,000 BTU
• Flow Rate: Up to 3.6 GPM
• Fuel Type: Natural Gas
• Dimensions: Compact design
• Connector Size: 1/2″ NPT

Pros

• Provides continuous hot water on demand without a preheating wait
• Offers four temperature modes for different household needs
• Energy-efficient design with an oxygen-free copper tank
• Includes the exhaust pipe, reducing additional installation costs

Cons

• May not be suitable for larger homes or households with high hot water demands
• Professional installation is strongly recommended for proper setup and safety
• Not recommended for areas above 2,000 feet in elevation

Customer Review

This Ranein natural gas tankless water heater does not have any customer reviews on the Amazon listing, as it is a relatively new product. However, the specifications and features suggest it could be a good budget-friendly option for small homes with moderate hot water needs.

Propane Gas Tankless Water Heater – ORBEK 100,000 BTU Up to 4.3 GPM Indoor Installation

Overview

The ORBEK 100,000 BTU propane tankless water heater is designed for indoor installation, providing endless hot water on demand for small to medium-sized homes. With a maximum flow rate of 4.3 GPM, this unit can serve multiple fixtures simultaneously.

Specs

• Heating Capacity: 100,000 BTU
• Flow Rate: Up to 4.3 GPM
• Fuel Type: Propane
• Dimensions: 20.5″H x 13.0″L x 7.0″W
• Connector Size: 3/4″ NPT

Pros

• Provides continuous hot water for 2-3 fixtures simultaneously
• CSA certified with advanced safety features
• Energy-efficient design with multiple heating modes
• Compact size saves over 50% of space compared to traditional tank heaters
• Stable temperature control and digital display for easy adjustment

Cons

• Requires propane fuel, which may not be accessible in all areas
• Professional installation is recommended for optimal performance and safety

Customer Review

The ORBEK propane tankless water heater does not have any customer reviews on the Amazon listing, as it is a relatively new product. However, the features and specifications suggest it could be a reliable and efficient option for small to medium-sized homes.

Buying Guide: Choosing the Best Gas Tankless Water Heater for Small Home

1. Heating Capacity and Flow Rate

• Consider the heating capacity (BTU) and flow rate (GPM) of the tankless water heater to ensure it can meet the hot water demands of your small home.
• A higher heating capacity and flow rate will allow the unit to serve more fixtures simultaneously, but may be overkill for a small home.
• Aim for a unit with a heating capacity of at least 80,000 BTU and a flow rate of 3-5 GPM, which should be sufficient for most small homes.

2. Fuel Type

• Decide between natural gas or propane tankless water heaters, depending on the fuel source available in your area.
• Natural gas is generally more widely available and may be the more convenient option, while propane may be better suited for remote or off-grid locations.
• Consider the ongoing fuel costs and availability when choosing between natural gas and propane.

3. Efficiency and Energy Savings

• Look for tankless water heaters with high energy efficiency ratings, such as a Uniform Energy Factor (UEF) of 0.8 or higher.
• More efficient units can help you save on energy costs, making them a smart long-term investment.
• Features like multiple heating modes and scale prevention technology can further improve energy efficiency and performance.

4. Installation and Venting

• Consider the installation requirements, including the type of venting (indoor or outdoor) and the connector size (3/4″ NPT is standard).
• Ensure the tankless water heater is compatible with your home’s plumbing and gas supply, and follow the manufacturer’s installation guidelines.
• Professional installation is highly recommended for optimal performance, safety, and compliance with local building codes.

5. Warranty and Customer Support

• Look for tankless water heaters with comprehensive warranties, covering both the entire unit and the heat exchanger.
• Consider the availability and quality of the manufacturer’s customer support, as this can be valuable if you encounter any issues with your new tankless water heater.
• A responsive and helpful customer service team can provide peace of mind and ensure a positive ownership experience.

FAQs

1. How do gas tankless water heaters compare to traditional tank water heaters?

Gas tankless water heaters offer several advantages over traditional tank water heaters, including endless hot water on demand, improved energy efficiency, and a more compact design. Tankless units heat water instantly as it is needed, eliminating the need for a storage tank and the associated standby energy losses.

2. What is the average lifespan of a gas tankless water heater?

Properly maintained gas tankless water heaters typically have a longer lifespan than traditional tank water heaters, with an average lifespan of 20 years or more. The lack of a storage tank and the use of durable materials like copper heat exchangers contribute to the longevity of tankless units.

3. How do I determine the right size gas tankless water heater for my small home?

When selecting a gas tankless water heater for a small home, consider the number of fixtures, the expected hot water usage, and the heating capacity (BTU) and flow rate (GPM) of the unit. As a general guideline, a 80,000-120,000 BTU tankless water heater with a flow rate of 3-5 GPM should be sufficient for most small homes.

4. Do gas tankless water heaters require regular maintenance?

Yes, gas tankless water heaters do require periodic maintenance to ensure optimal performance and longevity. This typically includes cleaning the water filters, checking for scale buildup, and inspecting the venting system. Following the manufacturer’s recommended maintenance schedule is crucial for maintaining the efficiency and reliability of your gas tankless water heater.

5. Are gas tankless water heaters suitable for cold climates?

Many gas tankless water heaters are designed to operate effectively in cold climates, with features like freeze protection and weatherproofing. However, it’s essential to follow the manufacturer’s guidelines regarding installation and use in cold environments, as some models may not be recommended for areas with frequent or extreme cold temperatures.

Conclusion

Gas tankless water heaters offer a compelling solution for small homes, providing endless hot water, improved energy efficiency, and a compact design. The products reviewed in this article showcase a range of options, from the high-performance ORBEK and A.O. Smith models to the more budget-friendly Ranein unit. By considering factors like heating capacity, fuel type, efficiency, and installation requirements, you can find the best gas tankless water heater to meet the hot water needs of your small home. With the right tankless water he