What is The Best Tankless Water Heater for Well Water [In 2025]

If you rely on well water in your home, finding the right tankless water heater can make a significant difference in your daily routine. Tankless water heaters offer a continuous supply of hot water, improved energy efficiency, and a compact design that saves valuable space. In this comprehensive review, we’ll explore the top-performing tankless water heater options for well water, helping you make an informed decision to meet your household’s needs.

5 Best Tankless Water Heater for Well Water Reviews

18kW Tankless Water Heater Electric, Orbek Instant On Demand Hot Water Heater 240V

Overview

The Orbek 18kW tankless water heater is a powerful and efficient solution for homes with well water. It provides up to 4.17 GPM of instant hot water, ensuring a comfortable experience for 2-3 fixtures simultaneously.

Specs

• Heating capacity: 18kW
• Flow rate: Up to 4.17 GPM
• Voltage: 240V
• Dimensions: 17″H x 13.0″L x 3.9″W

Pros

• Provides instant, endless hot water
• Highly energy-efficient, potentially reducing electricity costs by up to 60%
• Comprehensive safety features, including ETL certification
• Stable temperature control within 1°F
• Compact design for easy installation

Cons

• Requires 2 x 240V/40A two-pole breakers and 2 sets of 8 AWG wires for installation
• Higher initial cost compared to traditional tank-style heaters

Customer Review

Customers find the Orbek 18kW tankless water heater to be a reliable and efficient solution for their well water needs. They appreciate the quick heating, consistent temperature, and ease of installation, with one reviewer noting it “works great” and “exceeds expectations.”

NEW Rinnai RX199iN Condensing Smart Sense Natural Gas or Propane Tankless Water Heater

Overview

The Rinnai RX199iN is a versatile and high-performance tankless water heater suitable for well water systems. It can be installed indoors or outdoors and is compatible with both natural gas and propane, providing up to 11.1 GPM of hot water.

Specs

• Heating capacity: 199,000 BTU
• Flow rate: Up to 11.1 GPM
• Fuel type: Natural gas or propane
• Dimensions: Compact size of a small suitcase

Pros

• Versatile installation options (indoor or outdoor)
• Provides ample hot water for up to 7 fixtures simultaneously
• Highly energy-efficient with a UEF of .98
• Easy-to-use interface and Quick Flush feature for maintenance
• Compatible with Rinnai’s Controlr module for Wi-Fi control

Cons

• Professional installation is recommended for optimal performance
• Higher initial cost compared to some tankless water heater options

Customer Review

Customers praise the Rinnai RX199iN for its reliable performance and ample hot water supply, with one reviewer stating it “never runs out of hot water.” The compact size and versatile installation options are also noted as key benefits.

14kW Tankless Water Heater Electric, ORBEK 240 Volt On Demand Instant Hot Water Heater

Overview

The Orbek 14kW tankless water heater is a powerful and energy-efficient option for well water systems. It provides up to 3.38 GPM of instant hot water, making it suitable for 2-3 points of use simultaneously.

Specs

• Heating capacity: 14kW
• Flow rate: Up to 3.38 GPM
• Voltage: 240V
• Dimensions: 14.2″H x 9.5″L x 3.1″W

Pros

• Provides instant, endless hot water
• Highly energy-efficient, potentially reducing electricity costs by up to 60%
• Comprehensive safety features, including ETL certification
• Stable temperature control within 1°F
• Compact design for easy installation

Cons

• Requires a 240V/60AMP two-pole breaker and 1 set of 6 AWG wires for installation
• May not be suitable for larger households with higher hot water demands

Customer Review

Customers are pleased with the Orbek 14kW tankless water heater, highlighting its effective heating, easy installation, and compact size. One reviewer noted, “This water heater works great! It has been a godsend.”

Rheem Natural Gas Condensing Tankless Water Heater Indoor Up To 9 GPM, 180,000 BTUs Continuous Super High Efficient Hot Water

Overview

The Rheem RTGH-90DVLN-3 is a high-efficiency, natural gas-powered tankless water heater designed for well water systems. It delivers continuous hot water with a flow rate of up to 9 GPM, making it suitable for larger households.

Specs

• Heating capacity: 180,000 BTU
• Flow rate: Up to 9 GPM
• Fuel type: Natural gas
• Dimensions: 17-11/16-inch width

Pros

• Provides continuous, high-efficiency hot water
• Versatile temperature settings ranging from 100°F to 140°F
• Includes electric ignition for easy operation
• Covered by comprehensive manufacturer warranties
• Compact design for installation in small spaces

Cons

• May not be suitable for households with very high hot water demands
• Requires professional installation for optimal performance

Customer Review

While there are no customer reviews available for this specific model, the Rheem brand is well-known for producing high-quality, efficient tankless water heaters that are often praised by homeowners.

110V Tankless Water Heater Electric, 3000W Compact Water Heater Under Sink

Overview

The ECOTINYMACH 110V tankless water heater is a compact and versatile solution for well water systems, particularly in smaller or point-of-use applications. It provides instant hot water with the ability to switch between Fahrenheit and Celsius temperature scales.

Specs

• Heating capacity: 3000W
• Voltage: 110V
• Dimensions: Compact, designed for under-sink installation

Pros

• Compact and space-saving design
• Ability to switch between Fahrenheit and Celsius temperature scales
• Easy and straightforward installation process
• Energy-efficient and environmentally friendly

Cons

• May not be suitable for whole-home hot water needs
• Requires a 32AMP or higher circuit breaker for proper operation

Customer Review

Customers praise the ECOTINYMACH 110V tankless water heater for its compact size, easy installation, and efficient performance, particularly in point-of-use applications like sinks. One reviewer noted it’s “an excellent value” and “works great.”

Buying Guide: Choosing the Best Tankless Water Heater for Well Water

Heating Capacity and Flow Rate

• Consider the size of your household and the number of fixtures that will require hot water simultaneously. Choose a tankless water heater with a heating capacity and flow rate that can meet your household’s hot water demands.

Fuel Type and Voltage

• Determine whether you have access to natural gas, propane, or electricity in your home, and select a tankless water heater that is compatible with your fuel source and voltage requirements.

Energy Efficiency

• Look for tankless water heaters with high energy efficiency ratings, as they can help reduce your energy bills and environmental impact.

Safety Features

• Ensure the tankless water heater you choose has comprehensive safety features, such as leak protection, overheat protection, and ETL/UL certification.

Installation and Maintenance

• Consider the ease of installation and accessibility for maintenance, as these factors can impact the long-term performance and cost-effectiveness of your tankless water heater.

FAQs

1. What are the main benefits of a tankless water heater for well water?

Tankless water heaters offer several benefits for well water systems, including a continuous supply of hot water, improved energy efficiency, and a compact design that saves space. They can also be more reliable and require less maintenance compared to traditional tank-style water heaters.

2. How do I determine the right size tankless water heater for my home?

The size of the tankless water heater you need depends on your household’s hot water demand, which is influenced by factors like the number of bathrooms, appliances, and occupants. It’s recommended to consult with a professional to ensure you select a model that can adequately meet your home’s hot water needs.

3. Do tankless water heaters require special installation considerations for well water?

While tankless water heaters can be used with well water, it’s important to ensure the water quality is compatible with the heater’s materials and components. Regular maintenance, such as flushing the system, may be necessary to prevent mineral buildup and ensure optimal performance.

4. How do I maintain a tankless water heater for well water?

Proper maintenance is crucial for the longevity and performance of a tankless water heater used with well water. This typically includes regular flushing of the system, cleaning the water filters, and inspecting the heat exchanger for any signs of scaling or corrosion.

5. Are there any special considerations for installing a tankless water heater in a well water system?

When installing a tankless water heater in a well water system, it’s important to ensure the water quality is compatible with the heater’s components. This may include pre-treating the water to remove any contaminants or minerals that could lead to scaling or corrosion. It’s recommended to consult with a professional installer to ensure a seamless and efficient integration with your well water system.

Conclusion

Choosing the right tankless water heater for a well water system is crucial for ensuring a reliable and efficient hot water supply in your home. The products reviewed in this article offer a range of features and capabilities to meet the diverse needs of homeowners. By considering factors like heating capacity, fuel type, energy efficiency, and safety features, you can make an informed decision that will provide long-lasting performance and value. Remember to consult with a professional installer to ensure a proper integration with your well water system for optimal results.