Best 400k BTU Natural Gas Pool Heater in 2025
Updated on July 2025
#1
Recommended
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- Recommended for pools up to 42,000 gallons, suitable for both in-ground and above-ground use.
- Electric-powered with high efficiency, providing 140,000 BTU of heat with an equivalent efficiency of 540%.
- Equipped with advanced technology including a full DC inverter fan motor and twin rotary compressor for balanced operation and reduced noise.
- Offers wireless control via mobile app for temperature management and scheduling from anywhere.
- Includes USA-based customer support and is CSA and AHRI certified for quality assurance.
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- Recommended for pools up to 42,000 gallons, suitable for both in-ground and above-ground use.
- Electric-powered with high efficiency, providing 140,000 BTU of heat with an equivalent efficiency of 540%.
- Equipped with advanced technology including a full DC inverter fan motor and twin rotary compressor for balanced operation and reduced noise.
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#2
Value for Money
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- Premium heating performance with a 400,000 BTU capacity
- Durable cupro nickel heat exchanger resists corrosion and extends product life
- Efficient hydraulic design lowers pump run time, enhancing energy savings
- User-friendly front-panel access and control pad for simplified operation
- Complies with low NOx emissions standards for reduced environmental impact
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- Premium heating performance with a 400,000 BTU capacity
- Durable cupro nickel heat exchanger resists corrosion and extends product life
- Efficient hydraulic design lowers pump run time, enhancing energy savings
- User-friendly front-panel access and control pad for simplified operation
- Complies with low NOx emissions standards for reduced environmental impact
#3
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- Integral Fin Copper Exchanger Tube
- Corrosion-Free Polymer Headers
- Backlit LCD Controls
- Self-Diagnostic Microprocessor Controlled Ignition
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- Integral Fin Copper Exchanger Tube
- Corrosion-Free Polymer Headers
- Backlit LCD Controls
- Self-Diagnostic Microprocessor Controlled Ignition
#4
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- Pentair 474061 kit designed for heat exchangers
- Compatible with 400K heater systems
- Provides efficient heat transfer for pool and spa systems
- Easy installation for quick repairs or replacements
- Durable construction for long-lasting performance
- Enhances the efficiency of heating systems
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- Pentair 474061 kit designed for heat exchangers
- Compatible with 400K heater systems
- Provides efficient heat transfer for pool and spa systems
- Easy installation for quick repairs or replacements
- Durable construction for long-lasting performance
- Enhances the efficiency of heating systems
#5
9% Off
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- Maintains a consistent pool temperature, extending your swimming season into cooler spring and fall climates.
- Utilizes full DC inverter technology for efficient temperature regulation according to ambient conditions.
- Offers heating capacity up to 75,000 BTU, leading to significant cost savings on energy compared to traditional gas heating.
- Optimized for outdoor temperatures above 60°F; efficiency may decrease in colder weather, and using a pool cover can help improve heat retention.
- Designed for pools and spas up to 21,100 gallons, with a titanium heat exchanger resistant to corrosion; not suitable for inflatable pools.
- Features an intuitive control panel or mobile app for easy operation and scheduling.
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- Maintains a consistent pool temperature, extending your swimming season into cooler spring and fall climates.
- Utilizes full DC inverter technology for efficient temperature regulation according to ambient conditions.
- Offers heating capacity up to 75,000 BTU, leading to significant cost savings on energy compared to traditional gas heating.
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#6
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- Environmentally friendly electric heater reduces reliance on gas or propane by transferring heat from air to water.
- Compatible with in-ground pools up to 15,000 gallons and above-ground pools up to 27 feet round or 18 by 33 feet oval, performing best in humid climates above 50°F.
- High-efficiency design with advanced compressors and titanium heat exchangers ensures energy savings and reliable late-season swimming.
- Durable enamel-coated steel chassis can withstand outdoor conditions and features a compact size for versatile installation.
- User-friendly digital control panel allows for easy temperature adjustments, with an optional extension cable for flexible placement.
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- Environmentally friendly electric heater reduces reliance on gas or propane by transferring heat from air to water.
- Compatible with in-ground pools up to 15,000 gallons and above-ground pools up to 27 feet round or 18 by 33 feet oval, performing best in humid climates above 50°F.
- High-efficiency design with advanced compressors and titanium heat exchangers ensures energy savings and reliable late-season swimming.
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#7
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- Powered by electricity, minimizing environmental impact compared to gas or propane heaters, and requires low maintenance.
- Compatible with in-ground pools up to 10,000 gallons and above-ground pools up to 21-foot round or 15 by 30-foot oval; optimal performance in humid climates down to 50 degrees.
- Designed for high efficiency with advanced compressors and titanium heat exchangers, ensuring energy savings and extended swimming seasons without high electric bills.
- Durable enamel-coated steel chassis built to endure outdoor conditions, with a compact size of 16"x40"x24" for flexible installation options.
- Features a user-friendly digital control panel for easy temperature management, with an optional extension cable for customized placement.
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- Powered by electricity, minimizing environmental impact compared to gas or propane heaters, and requires low maintenance.
- Compatible with in-ground pools up to 10,000 gallons and above-ground pools up to 21-foot round or 15 by 30-foot oval; optimal performance in humid climates down to 50 degrees.
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#8
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- Durable polyester-coated cabinet resists corrosion.
- Low-profile design for efficient outdoor drafting.
- Options for digital electronic ignition or millivolt design.
- High efficiency ratings for energy-smart performance.
- BTU capacity of 206,000.
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- Durable polyester-coated cabinet resists corrosion.
- Low-profile design for efficient outdoor drafting.
- Options for digital electronic ignition or millivolt design.
- High efficiency ratings for energy-smart performance.
- BTU capacity of 206,000.
#9
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- Uses radiant heat to warm people and objects directly rather than the surrounding air
- Space-saving design allows for overhead mounting, maximizing deck or patio space
- Automated ignition system eliminates the need for manual lighting; operates via electrical controls
- Integrated safety shut-off mechanism reduces fire risk
- Requires a 24-volt electrical connection for ignition system
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- Uses radiant heat to warm people and objects directly rather than the surrounding air
- Space-saving design allows for overhead mounting, maximizing deck or patio space
- Automated ignition system eliminates the need for manual lighting; operates via electrical controls
- Integrated safety shut-off mechanism reduces fire risk
- Requires a 24-volt electrical connection for ignition system
#10
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- Durable polyester-coated cabinet that resists corrosion.
- Low-profile design enables natural draft in outdoor setups.
- Features digital electronic ignition or millivolt option.
- Raypak heaters are known for high energy efficiency.
- Output of 266,000 BTU.
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- Durable polyester-coated cabinet that resists corrosion.
- Low-profile design enables natural draft in outdoor setups.
- Features digital electronic ignition or millivolt option.
- Raypak heaters are known for high energy efficiency.
- Output of 266,000 BTU.
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