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The 8 Best 400k btu pool heaters of 2024

Are you trying to find 400k btu pool heaters among various brands on the market but aren’t sure where to begin? To assist you in finding the right one, we’ve put together a list of the 7 best to help you pick the perfect one!

We investigated and evaluated a number of the top-selling 400k btu pool heaters on the market in order to create our list of the best. Making a decision among the many options available is never simple. There are an infinite number of models available, each with a distinct price. And as you’ll find out, the best options aren’t usually the ones you imagine! This comparison is rich and relevant because of the numerous factors that were employed. You will find products featured in this ranking not only based on their pricing but also on their features and other customers reviews. To write this review, we completed 15 hours of research and did 47 400k btu pool heaters tests. You won’t need to pick products at random any more. If you’re unsure of what to look for, browse our list and consult the buying guide!

An overview of our top picks

Table of contents

The best 400k btu pool heaters you can buy today

No. 1
Pentair 77707-0209 400K-BTU Manifold Internals Replacement Pool and Spa Heater
  • Manifold internals replacement
  • Fits Pentair pool and spa heater
  • Includes 400K-BTU
No. 2
Pentair 77707-0113 400K-BTU Air Orifice Replacement Kit Pool and Spa Heater Burner System
  • Air orifice replacement kit
  • Fits Pentair Sta-Rite Max-E-Therm heater burner system model 400
  • Also fits Pentair MasterTemp heater burner system model 400
  • Includes 400k-BTU
No. 3
Hayward HWS400 High Wind Stack Outdoor Draft Hood Replacement for Hayward H400 H-Series 400K-BTU Millivolt Gas Heater
  • High wind stack outdoor draft hood
  • Fits Hayward H-Series millivolt 400,000-BTU gas heater model H400
  • Allows for proper ventilation of the heaters exhaust fumes
No. 5
Raypak 406,000 BTU Digital Electronic Ignition Natural Gas Pool Heater
  • Built to withstand various weather conditions, perfect solution for environments requiring efficiency, convenience and versatility.
  • Intermittent spark ignition pilot safety controls. Pilot only comes on when there is a call for heat.
  • Space-age material means the heater won't retain residual heat after it is turned off, allowing it to be installed without the use of costly metal heat sinks.
  • Part Number: 009219 | Model Number: P-R406A-EN-C
  • PLEASE NOTE: Item is unable to be shipped to state of California
No. 6
Hayward W3H400FDN Universal H-Series 400,000 BTU Natural Gas Pool and Spa Heater for In-Ground Pools and Spas
  • BEST FOR: In-ground pools and spas with a surface area up to 1,200 ft. where natural gas is available. Its low environmental impact makes it ideal for pools and spas located where low-NOx emissions are required.
  • PREMIUM PERFORMANCE: The Hayward Universal H-Series 400,000 BTU Natural Gas Heater delivers fast premium heating performance for years of reliable, long-lasting comfort.
  • CORROSION PROTECTION: The Universal H-Series boasts exceptional protection against corrosion and premature failure caused by unbalanced water chemistry.
  • ENERGY SAVINGS: The efficient, industry-leading design reduces circulation pump run time to provide energy savings.
  • EASY-TO-USE: Intuitive front control panel provides easy operation, service and maintenance.
No. 7
MasterTemp EC-462028 Pool Heater, Almond
  • Built to last with tough rust proof exterior
  • Premix combustion technology for fast and efficient warm-ups
  • Built in safety features to ensure system protection
  • Rotatable, easy-to-use, intuitive operation controls
  • Certified for outdoor and indoor installation
No. 8
Hayward W3H400FDP Universal H-Series 400,000 BTU Propane Pool and Spa Heater for In-Ground Pools and Spas
  • BEST FOR: In-ground pools and spas with a surface area up to 1,200 ft. where natural gas is available. Its low environmental impact makes it ideal for pools and spas located where low-NOx emissions are required.
  • PREMIUM PERFORMANCE: The Hayward Universal H-Series 400,000 BTU Propane Heater delivers premium heating performance for years of reliable, long-lasting comfort.
  • CORROSION PROTECTION: The Universal H-Series boasts exceptional protection against corrosion and premature failure caused by unbalanced water chemistry.
  • ENERGY SAVINGS: The efficient, industry-leading design reduces circulation pump run time to provide energy savings.
  • EASY-TO-USE: Intuitive front control panel provides easy operation, service and maintenance.
No. 9
FibroPool Swimming Pool Heat Pump - FH135 35,000 BTU - for Above and In Ground Pools and Spas - High Efficiency, All Electric Heater - No Natural Gas or Propane Needed
  • CLEAN AND GREEN: The FH135 is powered by clean electricity, reducing the harmful environmental effects and cost of traditional heaters that use natural gas or propane. Our pumps instead move heat from the air into the water, which saves you money and is a breeze to maintain
  • COMPATIBLE WITH: In ground pools up to 7,500 gallons and above ground pools up to 18 foot round or 12 by 24 foot oval. As with all heat pumps, we recommend using in a humid climate down to 50 degrees for best performance. Dry climates are better served by a traditional gas heater
  • HIGH EFFICIENCY: Utilizing high-pressure differential compressors and titanium heat exchangers, FibroPool heat pumps are meticulously designed to be the most energy efficient in their class. You can rest comfortably knowing your family will enjoy years of late season swimming without feeling a squeeze on your electric bill
  • RUGGED DESIGN: Enamel-coated steel chassis is designed to withstand outdoor elements season after season. Slim profile measures just 16"x40"x24", offering a wide range of mounting options. Conveniently installs with included 1 1/2 inch compression fittings
  • EASY OPERATION: Digital control panel with an easy-to-read display offers convenient temperature setting and monitoring. Optional extension cable allows you to mount the control panel in a location that works best for you
SaleNo. 10
Raypak 406,000 Btu Digital Natural Gas Pool Heater with Cupro Nickel Ray-014941
  • Part Number: 014941
  • Model Number: P-R406A-EN-X
  • Cupro-nickel gas pool and spa heater
  • Pagoda design ensures heater stays active in harsh weather conditions
  • Microprocessor controlled thermostat
SaleNo. 11
Pentair 77707-2411 Gas Orifice Adjust Replacement Kit 400 Pool and Spa Natural Gas Heater
  • Gas orifice adjust replacement kit
  • Fits Pentair pool and spa natural gas heater model 400
  • Includes 400K-BTU
SaleNo. 12
15000 Btu/hr Pool Heater Work in Ambient temp(-4 -176°F) ,110V Plug for Above Ground Inground Pool Hot Tub Swimming SPA Heater, Up to 5000gallons with Titanium Exchanger 24Hours Heating Salt Water
  • Note:Since pool heat pumps are machines that utilize heat pump technology, Need 24 hours For Heating Water,please email and call us if you encounter any problems (e.g., error codes, frosting or no heat).1.Extend Your Pool Season: Nothing beats a warm swimming pool for your kids, pets and the whole family! Coasts Pool Heater, highly efficient, low operating cost, extend the fun for a few more months!Can Heat Sea Water or Salt Water.
  • 2.Energy Save: The Coasts pool heater based on heat pump technology. The operation only requires very limited electric input, hence its heat conversion rate can reach a score of COP 5.44. In other words, for every cent of electricity spent, 5.44 times heat is generated!
  • 3.Suitable for Pools up to 5000 Gallons.With Innovative flat-tube Titanium Heat Exchanger, the Heat Exchanging Efficiency is 30% Higher than Spiral Tubes.Can Heat Salt Water
  • 4.Easy to Install:The pool heater allowing fast and easy hookup without professional installation. Just hook up several quick connectors, then plug and play. No need tools, no need plumber.Please allow the machine enough place to dissipate heat and avoid blocking. If the machine is not heated, first check the fault code or panel display on the control panel.
  • 5. You need to confirm your water pump, and the advised water flow of our mini heat pump is 400~530GPH. If the water pump flow is too large and the water circulation is too fast, the heat pump will not have enough time to heat the water. You can use a diverter valve kit to divert and limit the flow.It is recommended to use an ordinary swimming pool cover or a solar swimming pool cover for heat preservation If you want your pool's temperature to rise quickly.
SaleNo. 13
Raypak 406,000 BTU Digital Electronic Ignition Propane Pool Heater
  • 406,000 BTU propane digital pool and spa heater
  • Microprocessor-controlled thermostat can be set precisely to your liking , set it and forget it
  • Cabinet and the internals are non-corrosive and rust resistant
  • Features PolyTuf powder coating, polymer headers, and an all copper-fin-tube heat exchanger
  • Also features a stainless steel tube sheet, 2 inch CPVC water connections, burner tray and fire tile
No. 14
Pentair 77707-0411 Gas Orifice Replacement Kit Pool and Spa Natural Gas Heater
  • Gas orifice replacement kit
  • Fits Pentair Sta-Rite Max-E-Therm pool and spa natural gas heater model 400
  • Also fits Pentair MasterTemp pool and spa natural gas heater model 400
  • Includes 400K-BTU
SaleNo. 15
ABORON-Pool Water Heater for Above Ground Pools,Pool Heat Pump,14300 BTU/hr,Up to 2300 gallons,110V~120V/60Hz
  • 🌴【Ideal Choice for Above Ground Pools】The mini pool heat pump is specially designed for small pools of up to 2700 gallons. It is suitable for above-ground swimming pools, hot tubs or spas.
  • 🌴【Energy Save】 The pool heater based on professional technology. The operation only requires very limited electric input, thus its heat conversion rate can reach a score of COP 5.4. In other words, for every cent of electricity spent, 5.4 times heat is generated!
  • 🌴【Convenient Assembly】It allows fast and easy hookup without professional installation, just hook up several quick connectors, then plug and play. 110V, 60Hz for USA electricity and built in 8 foot long power cable with standard USA plug.
  • 🌴【Premium Security】 Available with the child lock and an advanced protection system which has auto electrical leakage and low-voltage switch, high and low-temperature, and compressor discharge over-high protection
  • 🌴【Premium】 Equipped with a powerful compressor, the pool heat pump has 2 kinds of capacity, A80.6W80.6 14331 BTU/hr and A56 W78.8 8496 BTU/hr.The pure titanium heat exchanger can resist any corrosion from pool water. An intelligent control system maintains the pool temperature at a consistent level. It also adds 4 way valve to help defrosting automatically.
No. 16
DOEL 12000 BTU Mini Swimming Pool Heat Pump for Above-Ground Pools, 3.45 kW Electric Pool Heater with Titanium Heat Exchanger, 110V 60Hz
  • Efficient and Energy-saving: Our 3.45kW mini pool heat pump utilizes advanced heat pump technology to efficiently convert the heat from the surrounding air into pool water heating, resulting in significant energy savings and reduced operating costs.
  • Compact and Durable Design: Crafted with robust sheet metal material, our heat pump boasts a sturdy construction that ensures long-lasting performance. The high-quality copper pipes facilitate rapid heat exchange, enabling quick and reliable heating of your pool water.
  • Environmentally Friendly: With the use of R410A refrigerant, our air-source pool heat pump operates in an eco-friendly manner, minimizing environmental impact and carbon emissions. It provides a sustainable heating solution for your pool while preserving the planet.
  • Easy Installation and Versatility: Our mini pool heat pump is designed for hassle-free installation. We provide two pipe connectors, along with a comprehensive instruction manual, making the setup process convenient and straightforward. It is suitable for above-ground inflatable pools and spas with a capacity of up to 4000 gallons.
  • Superior Customer Service and Warranty: We take pride in offering excellent customer service, including pre-sales consultation, installation guidance, technical support, and after-sales assistance. We provide a one-year warranty to ensure your peace of mind and a satisfying experience with our product.
No. 17
villastar Pool Heater for Above Ground Pool, Pool Heater, Pool Heat Pump 30000 BTU/hr, Pool Heater for Inground Pools, Up to 10000gallons, 220V Pool Heater Above Ground
  • 【ENJOY LONGER USE】There's nothing better than a warm pool for your loved ones, children, pets, and the whole family! Villastar Pool heater KFYCC-8.5, high efficiency, energy saving, low operating costs, extended months of fun! It's your perfect heat pump solution!
  • 【SAVE MONEY AND HIGH EFFICIENCY】Villastar pool heat pump has been carefully designed to be the most energy efficient in its class. Only a very limited power input is required for operation, so its thermal conversion rate can reach a score of COP 5.9. In other words, for every penny of electricity consumed, 5.9 times more heat is generated! So you won't waste a dime, and you won't have to worry about electric bills while your family enjoys swimming.
  • 【IDEAL MULTI-PURPOSE POOL HEAT PUMP】This electric pool heater is suitable for small above-ground pools up to 10000 gallons and underground pools up to 9000 gallons (suitable for rectangles between 8 x 16 ft and 16 x 32 ft). The device can operate at outdoor temperatures ranging from 19.4ºF to 109.4ºF, while the pool can be heated to 104ºF.
  • 【EASY OPERATION】Pool heater KFYCC-8.5 can be connected quickly and easily without professional installation. Multiple installation options are available, 1.2 "/32mm water pipe connection, quick and easy ground, no plumber required. Setting the water temperature is displayed on the LED display, and the control setting is simple and fast.
  • 【RUGGED DESIGN】Villastar pool heaters are designed with galvanized steel, which does not rust or deteriorate. The KFYCC-8.5 Pool heat pump is equipped with a high-power compressor with an output power of 30000 BTU/hr. Pure titanium heat exchanger for water. An intelligent control system, easy to operate.
  • 【ADVANCED SAFETY】Villastar pool heater built-in advanced protection system, with automatic leakage protection, a low-pressure switch, high and low-temperature protection, compressor exhaust protection, and other functions. Keep you and your family safe!
No. 18
Pentair EC-462025 Heaters, White
  • GREAT FOR SMALLER POOLS: Propane heater boasts 125,000 BTUs, designed for smaller bodies of water up to 15,000 gallons
  • COMPACT AND EFFICIENT: Compact design with 82-percent efficiency as compared to larger pool heaters; Quiet operation makes sure not to impose on leisure pool time
  • THOUGHTFUL, USER-FRIENDLY DESIGN:: Rotating digital display allows for any installation rotation and is easy to read; User-friendly indicator lights allow for simple system operation and monitoring; Corrosion and UV-resistant housing deliver durable, lasting use
  • SAFETY FEATURES: Water pressure and stack flue sensor for overheat prevention, auto shut-off when the temperature exceeds factory limits, and manual shut-off for servicing; Certified for Low NOx emissions
  • SPECIFICATIONS: Voltage: 120/240V; Intake/discharge plumbing: 1.5-inch; Dimensions (L x W x H): 31.5 x 21 x 23 inches; Weight: 80 pounds
No. 19
Hayward W3HP21404T HeatPro 140,000 BTU Pool Heat Pump for In-Ground Pools
  • BEST FOR: In-ground pools that are used regularly and benefit from maintaining an ideal consistent temperature. Non-corrosive design makes it durable for coastal climates.
  • ECONOMICAL HEATING: Using the surrounding air to heat the pool, HeatPro is more economical than propane, natural gas and electric heaters for maintaining the ideal water temperature.
  • UNPARALLELED DURABILITY: Ultra Gold corrosion-resistant technology provides unparalleled durability, even in harsh coastal environments.
  • CORROSION RESISTANT: Titanium heat exchanger ensures maximum heat transfer and provides excellent salt water and chemical corrosion resistance. UV-resistant body panels are impervious to corrosion and deterioration
  • TRUSTED BRAND: With over 80 years of experience, Hayward is an industry leader in manufacturing advanced pool equipment.
SaleNo. 20
Raypak 014786-156A Propane Gas Pool Heater 150K BTU for 0-1999ft Elevation
  • Part Number: 014786
  • Model Number: P-R156A-EP-C
  • Black color
  • Its very easy and elegant to use

How to choose a good 400k btu pool heaters

Does the idea of finding a fantastic 400k btu pool heaters make you anxious? When it comes to purchasing this product, specifically when deciding which model to select, has your head been spinning between options? You are not alone if that is the case. We are aware of the pressure involved in the purchasing process!

Your presence here indicates that you are interested in 400k btu pool heaters. Before choosing which product would be the best for your needs after being inundated with information, locate a reliable source with genuine selections. You can get that information from a variety of sources, including buying guides and rating websites, word-of-mouth recommendations from friends and family, online discussion forums where users can share their own experiences, product reviews that can be found all over the internet, and YouTube channels. You can only get the right product through exhaustive analysis. But you realize that’s not always simple. In order to ease your concerns, we have taken the time to develop a list of the top 400k btu pool heaters products available right now. You might be wondering how we came up with the list. How was this buying guide developed?

First, we used our algorithms to gather as much reliable data as we could about these products. To verify all the data gathered, we used both artificial intelligence and a lot of algorithms.
Then, our experts used criteria that are recognized in the business to evaluate them according to their quality to price ratio, allowing us to choose the top 400k btu pool heaters on the market right now!

The selection of the goods is not arbitrary. Before creating a list, we take into account a number of factors. Below are some of the criteria discussed:

Brand Value: What happens if you choose a dubious brand just because it appears to be a good deal? So the likelihood of receiving a product with a short shelf life increases. That is due to the fact that well-known brands have a reputation to uphold, while others do not. Top 400k btu pool heaters brands strive to provide some distinctive traits that set them apart from the competition. So, hopefully one or more of the items on our list will be perfect for you.

Features: Useful features are all you need, not tons of them. We consider the important aspects and select the top 400k btu pool heaters based on those.

Specifications: Numbers always help you measure the quality of a product in a quantitative way. We try to find products with higher specifications, but with the right balance.

Quality: A product’s quality may always be quantified with the aid of numbers. We look for goods with better standards that strike the proper balance. The best quality product that gets highly appreciated and recommended by experienced users.

Customer ratings:  Would it be accurate to suggest that the 400k btu pool heaters were used by hundreds of customers before you? Superior ratings indicate that many customers had better service.

Customer Reviews: Like ratings,  provide you with accurate and reliable information about the product from genuine customers. Customer ratings are very important to all of us because they contain accurate and reliable information about the customer service we received from several hundred customers.

Seller Rank: This is very intriguing! Not only do you need a good 400k btu pool heaters, you also need a product with rising sales that is trendy. It accomplishes two goals. First, the expanding user base proves the quality of the product. Second, given that number, producers must be able to offer greater quality and after-sales support.

Value: You get what you pay for, they say, so consider the value. Cheap isn’t always good and expensive isn’t always bad. However, that does not imply that spending a lot of money on a product that is flashy but underwhelming is a good idea. Before adding them to the list, we make an effort to evaluate how much value you can get for your money from your 400k btu pool heaters.

Durability: Durability and reliability are closely related concepts. You will benefit from a strong and long-lasting 400k btu pool heaters for months and years to come.

Product availability: Products come and go, and new ones replace the old ones. Most likely, a few new features and required changes were made. What use is it to use a supposedly good product if the maker no longer supports it? We make an effort to highlight products that are current and offered by one or more trustworthy sellers, if not more.

Negative Reviews: Yes, we do take that into account as well! The goods with the majority of bad reviews are filtered out and disregarded when we choose the best-rated one on the market.

These are the standards by which we selected our 400k btu pool heaters. Do we end our process there? Hell no. The most crucial fact about us that you should be aware of is that we regularly update our website with current and pertinent information. We have one more layer of filtration since we place the greatest importance on reader satisfaction. Please let us know if any product included here is incorrect, irrelevant, subpar, or simply out of date. We always value your opinions, and we’ll work hard to make any necessary corrections to our list in response to them.

Why should you believe us?

There are now thousands of possibilities for these products on Amazon, but choosing the best one can be difficult and time-consuming. And what 400k btu pool heaters should you purchase in 2022?

This guide is the result of more than 10 years of experience in researching, testing and writing about many topics. Each member of our team is an authority in their area. We read every article we could find online and every consumer review on every retail website for seven hours. Additionally, we discovered a ton of websites that offered helpful resources, including buying tips and thorough information on 400k btu pool heaters.