Best Tankless Water Heater in 2025
Updated on August 2025
#1
Recommended
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- Versatile installation options for indoor or outdoor use with Smart Sense gas control for propane or natural gas.
- Compact size similar to a small suitcase, capable of delivering up to 11.1 GPM to support multiple fixtures simultaneously.
- Efficient design featuring an easy-to-use interface, Quick Flush for maintenance, and high energy efficiency rated at UEF .98.
- Professional installation is advisable; support available through the Rinnai Central App for setup and troubleshooting.
- Comprehensive resources including product guides and manuals available for optimal sizing and performance in different regions.
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- Versatile installation options for indoor or outdoor use with Smart Sense gas control for propane or natural gas.
- Compact size similar to a small suitcase, capable of delivering up to 11.1 GPM to support multiple fixtures simultaneously.
- Efficient design featuring an easy-to-use interface, Quick Flush for maintenance, and high energy efficiency rated at UEF .98.
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#2
Value for Money
12% Off
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- Tankless design provides unlimited hot water flow for your home.
- Energy-efficient operation heats water only when needed, reducing energy consumption.
- Delivers up to 7.5 GPM for simultaneous use across multiple appliances.
- Professional installation is advised for optimal performance and safety.
- Comes with varying warranty coverage for heat exchanger, labor, and parts.
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- Tankless design provides unlimited hot water flow for your home.
- Energy-efficient operation heats water only when needed, reducing energy consumption.
- Delivers up to 7.5 GPM for simultaneous use across multiple appliances.
- Professional installation is advised for optimal performance and safety.
- Comes with varying warranty coverage for heat exchanger, labor, and parts.
#3
6% Off
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- External thermostatic control with LED display offers +/- 1 degree accuracy
- Self-modulation technology adjusts power according to hot water demand
- Durable copper immersion heating elements with serviceable design; flow rate up to 4.4 GPM
- Bottom 3/4 inch NPT water connections facilitate straightforward installation
- Threaded design allows for easy replacement and includes digital temperature display
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- External thermostatic control with LED display offers +/- 1 degree accuracy
- Self-modulation technology adjusts power according to hot water demand
- Durable copper immersion heating elements with serviceable design; flow rate up to 4.4 GPM
- Bottom 3/4 inch NPT water connections facilitate straightforward installation
- Threaded design allows for easy replacement and includes digital temperature display
#4
32% Off
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- Provides unlimited hot water on demand; temperature is continuously monitored for consistent performance within 1 degree of the set temperature
- Compact design; 90% smaller than traditional tank heaters and can be installed on walls or at points of use
- Highly energy-efficient; operates at 99% thermal energy efficiency by heating water only when needed
- Suitable for small applications; ideal for bathrooms, sinks, or offices with a flow rate of 1.3 to 3.1 gallons per minute based on inlet water temperature
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- Provides unlimited hot water on demand; temperature is continuously monitored for consistent performance within 1 degree of the set temperature
- Compact design; 90% smaller than traditional tank heaters and can be installed on walls or at points of use
- Highly energy-efficient; operates at 99% thermal energy efficiency by heating water only when needed
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#5
22% Off
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- ON/OFF dial control with adjustable digital temperature display for precise settings
- Self-modulating power control for energy efficiency
- 24kW model delivers a flow rate of up to 5.9 GPM
- Features bottom 3/4" NPT water connections for easy installation
- Provides on-demand and continuous hot water
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- ON/OFF dial control with adjustable digital temperature display for precise settings
- Self-modulating power control for energy efficiency
- 24kW model delivers a flow rate of up to 5.9 GPM
- Features bottom 3/4" NPT water connections for easy installation
- Provides on-demand and continuous hot water
#6
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- Provides up to 3.38 GPM of instant hot water for 2-3 simultaneous uses
- Achieves 98% energy efficiency and reduces electricity costs by up to 60%
- Features safety protections including leakage, over-temperature, high voltage, and dry-heating safeguards; ETL certified for reliability
- Includes an LED display for real-time temperature updates, maintaining precision within 1℉ across a range of 86-140℉
- Compact design compatible with household plumbing using standard 1/2" NPT connectors; requires a 60AMP breaker and 6 AWG wiring
- Offers 2-year returns and exchanges, with ongoing technical support
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- Provides up to 3.38 GPM of instant hot water for 2-3 simultaneous uses
- Achieves 98% energy efficiency and reduces electricity costs by up to 60%
- Features safety protections including leakage, over-temperature, high voltage, and dry-heating safeguards; ETL certified for reliability
- Includes an LED display for real-time temperature updates, maintaining precision within 1℉ across a range of 86-140℉
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#7
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- ON/OFF dial control with a digital temperature display
- Self-modulating power control for efficiency
- 11kW model provides a flow rate of up to 2.68 GPM
- Features side 1/2" NPT water connections
- Delivers consistent and continuous hot water on demand
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- ON/OFF dial control with a digital temperature display
- Self-modulating power control for efficiency
- 11kW model provides a flow rate of up to 2.68 GPM
- Features side 1/2" NPT water connections
- Delivers consistent and continuous hot water on demand
#8
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- Tankless design for continuous hot water
- Operates at 220 volts for efficient performance
- Handles a maximum load of 54 amps
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- Tankless design for continuous hot water
- Operates at 220 volts for efficient performance
- Handles a maximum load of 54 amps
#9
34% Off
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- Operates at 42,000 BTUs for efficient RV plumbing hot water supply.
- Microprocessor ensures steady water flow by monitoring temperatures, mitigating cold spots and scalding.
- Uses 50% less LP gas compared to traditional six-gallon tank heaters for the same hot water volume.
- Digital control panel allows temperature adjustment from 95 to 124°F and displays continuous temperature readings and error codes.
- Professional installation is advised for optimal performance.
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- Operates at 42,000 BTUs for efficient RV plumbing hot water supply.
- Microprocessor ensures steady water flow by monitoring temperatures, mitigating cold spots and scalding.
- Uses 50% less LP gas compared to traditional six-gallon tank heaters for the same hot water volume.
- Digital control panel allows temperature adjustment from 95 to 124°F and displays continuous temperature readings and error codes.
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#10
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- Tankless water heater with CSA-approved regulator, offering enhanced safety features including flame failure, anti-freezing, and overheating protections, providing 4.74 gallons of hot water per minute under just 3.6 PSI water pressure.
- Efficient propane water heater designed with advanced combustion technology for reduced gas usage and noise, delivering immediate hot water with a maximum output of 68,000 BTU/hour while saving 11.5% more energy.
- Portable water heater designed for easy transport, suitable for camping, RVs, or pet bathing, measuring 24.23x5.9x13.4 inches and powered by two size 'D' batteries.
- Includes complete accessories such as a CSA-approved 5FT gas regulator, a high-pressure shower head with 5 spray modes, a 59-inch stainless steel hose, and various interface ports for easy connection.
- Ideal for outdoor use, this camping heater ensures hot showers while camping, hiking, fishing, or washing pets. Always check for gas leaks before use.
- Satisfaction guarantee offering a full refund or replacement within 3 months if not satisfied.
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- Tankless water heater with CSA-approved regulator, offering enhanced safety features including flame failure, anti-freezing, and overheating protections, providing 4.74 gallons of hot water per minute under just 3.6 PSI water pressure.
- Efficient propane water heater designed with advanced combustion technology for reduced gas usage and noise, delivering immediate hot water with a maximum output of 68,000 BTU/hour while saving 11.5% more energy.
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