What are the best In-Ground Pool Heaters?

If you love swimming yet you live in a relatively cold area where you get shivers even in the middle of summer, or you wish to make your swimming pool warmer for night swims, you should consider investing in an in-ground pool heater. A heater enables you to swim comfortably and it gives more relaxation. After all, it is never fun to swim when the water is freezing cold.

In-ground pool heaters can be very expensive, from buying the heater itself to installation. There are also a lot of types in the market, which makes choosing the right one difficult. The planning period may be overwhelming, not to mention stressful especially when you are in a tight budget.

Since it is a big investment, you would want to make your first choice right. To help you make a sound decision, we have listed the types of heaters available in the market and the most recommended ones by buyers like you.


What are the types of in-ground pool heaters?

There are multiple types of heater that can warm a huge space. Because of variety, it is difficult to find out which one will work best for your and your budget. We have listed the three most popular types, the Gas, Heat Pumps, and Solar.

If after you have read about the differences of these types and you still can’t decide, seeking the help of a professional where you can discuss factors such as the size of your home, electric provisions, and your climate, should be your next step. But for now, you need to familiarize yourself with these three:

Gas – This type of heater run using natural gas or propane as source of fuel. They are the ones found most in households with swimming pools because they can heat the pool fast and efficiently. Once installed correctly, running it is also a breeze. The cost of buying and installation is relatively low. But of course, this also depends on the model and the capacity of your chosen heater.

It is suggested that you connect your gas heater to an existing natural gas line to save up some bucks. But if you don’t, you can opt for a more costly propane gas tank that will be mounted above or below the ground. Propane is costly because you have to refill it every now and then. Gas heaters are thermostat controlled so you can control the temperature of your pool.

Heat Pumps – This type of heater works by extracting heat from the air and is therefore cheaper to maintain than gas heaters. If you are looking for efficiency and are a “green” supporter, you can opt for this one, as they are clean and economical. The cost of having this one installed is the same as the gas type. However, the heat pump itself costs a bit more than the gas heater. The only downside is that this takes quite some time to heat your pool and the outside temperature should be warm. The cooler the outside air, the more electricity this heater will consume to heat your pool.

Solar – This type of heater is the best if you want to save up money from electric or gas bills as its source of energy is the sun’s heat. For this type, you will need a solar heater with pool pump and a solar panel, which will collect the energy from the sun.

It’s recommended to have at least half of square footage of your pool in solar panels to effectively heat your pool. Solar heaters are only good if you live in a mostly sunny area, as it won’t capture much power if you live in an area where the climate is rainy or cloudy. However, this one is really a good and efficient option.


What are the most popular brands of in-ground pool heaters?


Hayward Universal H-Series Low Nox Natural Gas Pool Heater

Hayward H250FDN Universal H-Series 250,000 BTU Pool and Spa Heater, Natural Gas, Low Nox
  • Standard Cupro nickel heat exchanger for superior value and reliability
  • Patented polymer header and bypass valve design for the ultimate in hydraulic efficiency and reliability
  • Hayward Universal design for easy and versatile professional installation


Hayward has been producing heaters for over 40 years, so if you are looking for a company that already built its foundation and are known for the products they make, you should pick this heater.

They have a good reputation in this industry and they make products that are used by thousands of households. The heater is made of stainless steel burners and cupro-nickel heat exchanger for corrosion resistance. The water, electricity and gas connections can be located on left or right side for convenient installation. It is safe with salt chlorinators and is considered cheaper compared to its counterparts.


EcoSmart US Smart Electric Pool Heater

EcoSmart SMART POOL 27 Electric Tankless Pool Heater, 27kW, 240 Volt, 112.5 Amps with Self Modulating Technology
  • Flow Activation
  • Ecosmart Pool Heaters are compact and easy to install for a new or existing pool
  • Set your temperature digitally to increments of 1-Degree. Set it and forget it.


EcoSmart Pool Heaters use its latest flow sensor technology instead of the traditional pressure switch activation that not only reduces the risk of burned elements but also increase the machine’s reliability and longevity.

It comes with a digital thermostat control that makes it easier for you to set the temperature you want. Installation is pretty straightforward, and the finish of the heater is very modern and “Eco-smart”. It is able to warm up your pool pretty fast, with two to three degrees up an hour.


Solar Arc Heating Unit for Swimming Pools


This is a compact heater for your swimming pool that doesn’t take up so much space than traditional panel systems. The panel is warmed by the sun, which is converted into power for heating.

The Solar Arc is the most cost effective and eco-friendly way to heat your swimming pool. It is also easily installed to your current plumbing line and has built-in legs that make it easy to be positioned in an angle where it can get the most sun exposure.



In-ground pool heaters allow you to extend the swimming time because you won’t have to worry about the water getting too cold after sunset. It is also helpful if you want to go for a swim even though the summer is long gone. What use will your $20,000 pool have if you will only get to swim in it during the warm months? Jazz it up with a heater and you’ll have a warm and relaxing pool for the entire year.