How to choose the best electric pool heater?


If you want to extend your swimming into the cold season, you will need a pool heater that will add some warmth to your pool water. Bearing in mind that during the cold winter there is little or even no sunshine at all, a good alternative to solar pool heating is an electric pool heater. As the name suggests, these are pool heating systems that are powered solely by electricity.

Why Choose Electric Pool Heaters?

Even though electric pool heaters may shoot your energy bills, they are very reliable compared to solar pool heaters that may fail to warm your pool water when there is a scarcity of sunshine. These heaters also warm pool water quite faster than other types of pool heaters.

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Review of the Best Electric Pool Heaters

In the current market, there are several electric pool heaters from different companies. Each of these pool heaters has different features and prices. This may make shopping quite a hassle, especially for first-time buyers. With this in mind, we have decided to make things simple by compiling a review of the best, reliable and efficient electric pool heaters in the market.

1. EcoSmart ECO 18 Electric Tankless Water Heater with Patented Self-Modulating Technology

How to choose the best electric pool heater?
The EcoSmart ECO 18 is a revolutionary electric pool heater that is designed in a fresh tankless design with Self-Modulating Technology. It is very easy to use and has been optimized to be highly energy efficient. Here is a review of the EcoSmart ECO 18 Electric Tankless Water Heater.

Simple, Compact Design

Contrary to what we’d expect, this pool heater sports a simple, compact and lightweight design. It measures 20 X 20 X 6.5 inches and weighs only 14 pounds. Like earlier mentioned, it is tankless. This makes it easy for it to be installed almost anywhere making it ideal for those working in minimal space. On average, it saves up to 12 cubic feet when compared to similar heaters in its range.

Self-Modulating Technology

The EcoSmart ECO 18 comes with the unique patented Self-Modulating Technology. This enables the heater to adjust the set temperature depending on the current heating needs. If the water is frigid, the set temperature will adapt to higher temperatures and vice-versa

User-Friendly Features

When it comes to operation, this electric pool heater has been engineered to offer an unrivaled user experience. First, it has digital temperature control for easy temperature setting. The 1-degree increments, on the other hand, ensures accuracy when setting the temperature.

Unsurpassed Energy Efficiency

This pool heater from EcoSmart has been optimized for energy efficiency. According to the manufacturer’s website, the tankless heater has been proven to cut energy costs by up to 60% -). The copper and stainless steel components also improve efficiency.

Lifetime Warranty

This pool heater comes with a lifetime warranty, so you don’t need to worry about repairs in case it breaks down. However, the warranty is valid for major parts only.


  • Compact tankless design
  • Copper and stainless steel components
  • Self-Modulating Technology
  • Digital temperature control
  • 1-degree temperature increments
  • .25 GPM Activation Flow
  • 18 kW at 240V, Single Phase
  • Thermal Auto Protection
  • 99.8 % Energy Efficiency Score
  • ETL Listed to UL 499 & CSA
  • 125 amp electrical panel
  • 60 amp double pole breaker
  • Assorted wires and cables
  • Lifetime Warranty
  • Space saving design
  • Highly energy efficiently
  • Precise temperature controls
  • Lifetime warranty
  • ETL Listed to UL 499 & CSA
  • Ideal for small homes only
  • Requires professional installation
Even though this pool heater is not best suited for large households, it is still a great purchase for anyone looking for an energy efficient electric pool heater. It is also space saving enabling pool owners to install it almost anywhere. With a lifetime warranty and ETL Listed to UL 499 & CSA certification, the EcoSmart ECO 18 Electric Tankless Water Heater with Patented Self-Modulating Technology is a great bargain!

2. Hayward HP21104T HeatPro Titanium 110,000 BTU AHRI Residential Pool Heat Pump

How to choose the best electric pool heater?

The Hayward HP21104T HeatPro is another great, energy-efficient and durable electric pool heater. It has been manufactured by Hayward, a renowned manufacturer of environmentally friendly pool and spa equipment for both residential and commercial inground and above ground pools. The most notable features of this heater include the industry’s only Standard Ultra Gold corrosion resistant evaporator fin that improves durability and efficiency. It also offers low-noise operation making it ideal for domestic use. Here is a detailed review of the Hayward HP21104T HeatPro.

Compact, Round Design

The size of a pool heater matters and that is why Hayward emphasized on a small pool heater that would easily be compatible with most households. It has been crafted from high-grade stainless steel material that is corrosion resistant. This heater features a simple, round design with a compact footprint for easy installation and compatibility with retrofit replacements. The design also features integrated hurricane tie-downs to meet the local codes without necessarily having accessory kits.

Performance You Can Rely On

The Hayward HeatPro sports a Titanium Heat Exchanger that guarantees the best performance even in unbearable conditions. This exchanger is pressure tested, highly energy efficient and impervious to corrosion. This makes the pool heater reliable and most importantly, durable.

Built to Last

The Hayward HeatPro also comes with the Ultra Gold corrosion resistant coated evaporator coil fin that improves durability near coastal and other corrosive areas. The fan guard is also vinyl-coated to shield it from debris that may destroy it.

Easy Control

Unlike most pool heaters out there, the Hayward HP21104T has a digital LED panel that displays the set temperature. The LED also shows the pool water temperature always. The temperature setting, on the other hand, is in 1-degree increments to guarantee accuracy. The heater also supports electronic frost control and temperature lock-out.

Low-Noise Operation

One fantastic feature of this pool heater that sets it apart from the rest is the low-noise operation. It runs on a scroll compressor; the quietest compressor ever made. It has also been equipped with an acoustic compressor cover that ensures minimal sound is emitted to the environment. The profiled fan blade design also improves airflow thus reducing noise.


  • Compact, round design
  • High-grade UV-resistant body panels
  • 110,000 BTU
  • Voltage: 240
  • Hertz: 60
  • Phase: Single
  • Circuit Amps: 50
  • Ultra Gold corrosion resistant evaporator coil fin
  • Scroll compressor
  • Continuous pool temperature display
  • Dual Thermostat for pool and spa
  • Frost control and temperature lock-out
  • Acoustic compressor cover
  • Self-diagnostic codes
  • 2-in x 2 1/2-in CPVC union plumbing connections
  • Eco-friendly R410A refrigerant
  • AHRI Certified Performance
  • Compact and durable design
  • Highly energy efficiently
  • Easy and accurate controls
  • Self-diagnosis
  • Displays pool water temperature
  • UV-resistant body panels
  • Installation is a little bit complex
If you are looking for efficiency and convenience, then the Hayward HP21104T HeatPro is the ultimate pool heater for you. It boasts of the best-in-class performance courtesy of the high-tech features it has been engineered with. The operation is also easy and convenient with the digital display. Even though installation is a little bit tricky, you will surely love its performance!

3. Hayward CSPAXI11 11-Kilowatt ComfortZone Electric Spa Heater

How to choose the best electric pool heater?

The Hayward CSPAXI11 is a compact electric resistance water heater that has been specially designed for spas and small pools. This heater has a compact design to allow installation even when you are in limited space. It features a 304 stainless steel tank and threaded head which bolsters its efficiency. In this video, you can see all its major features. Here is the review of the Hayward CSPAXI11 11-Kilowatt Electric Spa Heater.

Compact Design

Just like most Hayward pool heaters, the CSPAXI11 sports a unique, compact design that makes it easy to install almost anywhere. You can fix it under the spa or even on the steps. The design also makes servicing easier and gives full access to internal controls.

Durable 304 Stainless Steel Components

The Hayward CSPAXI11 11-Kilowatt Electric Spa Heater has a 304 stainless steel tank that is durable and efficient. It also has a 304 stainless steel threaded head which improves its working mechanism.

Excellent Performance

When it comes to performance, the Hayward CSPAXI1 has a safety sensor electric heating element which has been optimized to heat water very fast using minimal energy. Rated at 11Kw, it heats water at a rate of approximately 5-degrees Fahrenheit per hour. So, depending on the water temperature, you can enjoy a warm spa or pool water in 4 – 6 hours.

Easy Control

This spa heater is very user-friendly. It has been equipped with a simple dial on the front for temperature setting. There is also an ‘on’ indicator light for easy operation and monitoring.


  • Compact design
  • 304 stainless steel tank
  • 304 stainless steel threaded head
  • Rated at 11Kw, 240V
  • Safety sensor heating element
  • Dial temperature control
  • Heater on indicator light
  • One year limited manufacturers warranty
  • Compact and durable design
  • Efficient heating
  • Easy control
  • Easy installation
  • Comes with warranty
  • Ideal for only small pools and spas
Even though it is specially meant to work with small pools and spas, the Hayward CSPAXI1 offers excellent performance. It has been built to last thus offering you years of exemplary service. It is easy to install and above all, easy to operate. If you love your spa or bath tub water warm, then this is your heater!
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Frequently Asked Questions

1. What is the best electric pool heater?

It`s a quite complicated task to choose the best model, as different people and pools need different functions. However, if you are looking for a heater for a small or medium pool, we recommend EcoSmart ECO 18 and Hayward CSPAXI11 11-Kilowatt ComfortZone heaters. They feature compact designs, digital temperature control, thermal auto protection, energy efficiency, and a lot of other pros. Hayward HP21104T HeatPro Titanium will suit big residential and commercial inground and above ground pools. It`s one of the best thanks to durable design, energy efficiency combined to high productivity, easy and accurate controls with displays.


2. Are electric pool heaters expensive to run?

We should say that electric heating of the pool isn`t sixpenny, since, depending on the pool size, you`ll spend about $100-$200 per month. However, such systems are much cheaper than gas heaters and can pay off if used in cold regions and during cold seasons.

3. Do electric pool heaters require professional installation?

Though some manufacturers claim their heaters have easy installation, we highly recommend asking for professional installation of your electric pool heater. The majority of items requires deep knowledge for installation, without which you may demage such an expensive equipment or even getting hurt yourself.

4. Why do I need an electric pool heater?

Electric pool heater is an expensive pleasure. Average cost of an item is over $1000 and can reach $2500, plus your electricity bills will increase by $150-$200 per month. So, you really need electric pool heater and it is a worthy investment only if you live in a cold region, you swim every single day, and want to use your pool year round.
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Wrap Up

Electric pool heaters are very efficient in heating pool water. Even though they may push your electricity bills to the limit, they are very reliable. Regardless of the season, you will get the best pool experience as they heat water to temperatures that you will love. So, if you are the type that wouldn’t do without swimming all year round, then you might just need an electric pool heater. Get any of the heaters above and brace up for the best pool experience even in the winter!

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