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+4 PersonsElectric Pool Heater
The electric heater is the fastest and most efficient method to heat pool water. Thanks to its compact size, you can install it yourself without the help of any technician and have the water at your desired temperature very quickly. Electric heaters are the simplest pool heating systems to install. They are inserted directly into the pool's filtration circuit and allow heating of outdoor or indoor pool water as well as Spas. When installing an electric heater, you should always consider its consumption, both for installation and to anticipate the necessary financial investment. You can check our guide to calculate it. Do not hesitate to contact Outlet Pool for more information about our electric pool heaters, from the best manufacturers and at the best price.
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30/06/2025Nos da muy buen resultado este producto. Hemos repetido en varias ocasiones.
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What is an electric heater?
Enjoying hot water in a pool all year round is easy. There are many products that will help us achieve this, and the electric heater is one of them.
The electric heater is a device that quickly heats the pool water. Moreover, with this device, we can reach higher temperatures than those achieved with a heat pump.
For this reason, it is a resource frequently used to heat spas or pools that require warmer water.
The electric heater is a highly efficient option for pool heating, suitable for in-ground or above-ground pools, both indoor and outdoor.
Features of an electric heater
L-shaped electric heater
Straight or inline electric heater
Among the features of electric heaters, we find the type of power supply, which can be single-phase or three-phase, depending on the installation.
They are usually small-sized elements, easily adaptable to almost any technical room. Thus, they come in different shapes, such as L-shaped or straight, the latter also called 'inline'.
These units have one or two heating elements responsible for heating the water. These elements can be made of stainless steel or titanium. Titanium elements are compatible with electrolysis or salt chlorination. Likewise, heaters with stainless steel elements are only suitable for pools treated with chlorine.
These devices include a digital (LCD screen) or analog thermostat that allows us to select and set the desired temperature at any time.
Regarding the body or casing, that is, the visible part of the device, it can be made of plastic, stainless steel, or titanium.
It is important to know that electric heaters operate from a minimum flow rate, so it is essential for their operation that the installation has sufficient flow as required by the electric heater itself. For this, all models include a flow sensor.
And the power? The truth is there are many options regarding power. Consider that the higher the heater's power, the faster the water temperature will rise. While the normal range is between 3 and 18 kW, there are electric heaters that reach up to 45 kW and even 120 kW. This power depends on many factors, such as the size of the pool to be heated, its location, climate, or insulation.
How does an electric heater work?
The electric heater is installed in the direction of water flow, after the filter and before the water treatment devices.
Its operation is simple since the water only needs to pass through its interior where the heating elements are housed. Whether it has one or two, these elements will turn on while water flows through them, transferring heat to the water that will exit the electric heater towards the pool or the disinfection treatment system if installed.
Simply put, cold water enters at one end, is heated inside as it passes through the element, and then exits towards the pool.
The correct operation of an electric heater always depends on proper installation and the correct choice of device.
Also, a thermostat is always necessary. The thermostat sets the desired water temperature. Once this part of the heater detects that the temperature has been reached, it will stop the heating elements.
Obviously, another essential condition for the electric heater to work is water circulation by the pump, since without water flow or with poor flow, the heater's flow sensor does not detect circulation and does not activate the elements. This prevents dry heating and the risk of burning the electric heater itself.
Installation of an electric heater
Knowing if our pool can accommodate an electric heater is very simple. If we can find space to open the circuit and install it, the installation is compatible.
The electric heater can be installed in an existing pool or one under construction; it can be located in the technical room, placed after the filtration system and before disinfection treatment systems such as electrolysis, ultraviolet, etc.
It is important that the water reaches as directly as possible from and to the pool, without much distance. This way, we avoid energy losses and extra costs in heating the pool.
Do not forget that, besides a technical room to place the device, access to electricity is also necessary. Without it, obviously, the electric heater cannot operate.
Installing a bypass system is highly recommended; this system of valves allows water not to flow through the heater when it is not in use.
Which electric heater to choose?
Regarding the choice of heater, we could focus on the material. For example, if the heater will be used for a long time throughout a season, it is better to choose metal electric heaters, preferably stainless steel ones.
These heaters are also the most durable, so if the device is likely to receive accidental impacts due to its location, they can be an excellent choice.
If you want to heat an above-ground pool periodically, a good option would be a heater with a plastic casing.
It is also important to consider water treatment. If electrolysis or salt chlorination is used, the only valid option is the titanium heater. This is because stainless steel ones do not guarantee proper operation.
Regarding the number of heating elements, remember that there are models with one and others with two. Electric heaters with two elements allow limiting consumption while the temperature reaches the desired point.
How to determine the power of a pool electric heater
Determining the power of an electric heater must be done carefully. First, it is necessary to observe the conditions of the pool where it will be installed, assessing possible heat losses. From there, the choice of heater power must be sufficient for the volume of water in our pool.
If the pool is already built, the best way to insulate it is by adding a pool cover or thermal blanket, a glazed cover, a slatted shutter, or even renovating by insulating walls and floor. Minimising heat loss ensures the pool water reaches the set temperature as quickly as possible and with lower consumption.
With this simple formula, we can calculate the heater power needed to heat our pool to a specific temperature within a set time (calculations are approximate as dissipation is not considered since it varies by installation).
P = 1.16 x ∆T / t x V
P = Power in kW
∆T = Temperature difference in °C
t = Time in hours
V = Volume in m³
What power do we need to heat the water to that temperature?
Let's include a simple example. We have a pool of 30m³, and we want to heat its water from 15°C to 25°C. If the heater will operate for 48 hours and there is no heat loss.
P = 1.16 x ∆T / t x V
P = 1.16 x (25-15) / 48 x 30 = 7.24 kW
How long does an electric heater take to heat my pool?
We can also find out how long an electric heater with a certain power will take to heat our pool. This information can be relevant when choosing between models.
With this other formula, we can know the time it will take to heat the pool water to a specific temperature (calculations are approximate as dissipation is not considered since it varies by installation).
t= 1.16 x ∆T / P x V
t = time in hours
∆T = Temperature difference in °C
P = Power in kW
V = Volume in m³
How long would it take to heat the water?
In this case, the example is as follows. We have a pool of 30m³, and we want to heat its water from 15°C to 25°C. We have a heater of about 6 kW and no heat loss.
t= 1.16 x ∆T / P x V
t = 1.16 x (25-15) / 6 x 30 = 58 hours.
What is the consumption cost of an electric heater?
To know how much an electric heater will consume, we need to look at its power. This power is indicated in Kilowatts (kW). This value shows the power the electric heater consumes during one hour of use. So, if the heater has 6 kW, it will consume 6 kW for each hour of use.
This data, indicated on any device, allows us to know daily and monthly consumption. However, to calculate this, we need to know how many hours per day the device will be running. For example, if a 6 kW heater is used for 4 hours a day: 6 kWh x 4 hours = 24 kWh per day.
It is also possible to calculate the monthly consumption:
24 kWh x 30 days = 720 kWh per month.
To get more precise data and convert this consumption into cost, it is necessary to know the electricity price. This price may vary depending on the electricity company and is shown on the company's bill (cost per kWh).
How to calculate the cost of one kilowatt?
For example, if the cost of one kilowatt-hour is 0.124 euros:
6 kWh x 4 hours = 24 kWh/day.
24 kWh/day x €0.124 = €2.976 per day.
24 kWh x 30 days = 720 kWh per month.
720 kWh x 0.124 = €89.28 per month.
Advantages and disadvantages of an electric heater
Advantages
The desired temperature is reached quickly.
Easy to use.
Moderate cost.
Quick to install.
Small size, therefore requiring little space for installation.
Disadvantages
Consumes more electricity than other devices.
Oriented towards smaller pools due to its consumption.
