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Best Pool Heater

last updated Sep 27, 2019

There is nothing like a refreshing dip in the pool no matter what the season is. It is not just during summer that swimming becomes a welcome recreation. A lot of people, like myself find swimming very relaxing especially at the end of the day when you are tired and stressed from work. A quick swim really does of a good job of helping most people relax. Hold that thought and let us give you a number of choices from Amazon of highly recommended pool heaters that you can purchase online for not just a good price but good quality. Enjoying a warm dip in your pool will soon be possible. Here are our 10 best picks!

In a Hurry? The test winner after 6 hrs of research

icon
FibroPool Heating
97.2/100 our score
Effectiveness
98
Accessories
98
Capacity
97
Power Source
97
Model
96
FibroPool Heating
Why is it better?

It doesn’t make a lot of noise

You can easily assemble and disassemble it

It gives you a lot of savings on your electric bill

In a Hurry? Editors choice:
FibroPool Heating
Test Winner: FibroPool Heating
Amazon Link
Researched Sources
15
Researched Sources
Reviews Considered
33
Reviews Considered
Hours Researching
6
Hours Researching
Products Evaluated
14
Products Evaluated
Last Updated:
Sami Kritz
By Sami Kritz:

Enjoy the benefits of your pool all year round with one of these top-rated pool heaters. Our newest addition to this list comes in at the #1 spot. FibroPool brings us a strong, reliable heater with 55,000 BTUs. Check out our new FAQ section and don't forget to vote and tell us which criterion is most important to you!

Sorting Options
Effectiveness Accessories Capacity Power Source Model By Default
Rank
PictureProduct
Name
Rating
Shops
#1
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97.2
Effectiveness
98 %
Accessories
98 %
Capacity
97 %
Power Source
97 %
Model
96 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$1,649.95
#2
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94
Effectiveness
96 %
Accessories
95 %
Capacity
94 %
Power Source
93 %
Model
92 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$1,749.95
#3
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Effectiveness
92 %
Accessories
91 %
Capacity
90 %
Power Source
89 %
Model
88 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$279.00
#4
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86
Effectiveness
88 %
Accessories
87 %
Capacity
86 %
Power Source
85 %
Model
84 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$451.57
#5
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
81
Effectiveness
83 %
Accessories
82 %
Capacity
81 %
Power Source
80 %
Model
79 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$568.43
#6
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
76
Effectiveness
78 %
Accessories
77 %
Capacity
76 %
Power Source
75 %
Model
74 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$250.98
#7
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
71
Effectiveness
73 %
Accessories
72 %
Capacity
71 %
Power Source
70 %
Model
69 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$2,499.99
#8
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
68.6
Effectiveness
69 %
Accessories
69 %
Capacity
69 %
Power Source
68 %
Model
68 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$2,484.98
#9
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
67.4
Effectiveness
68 %
Accessories
68 %
Capacity
67 %
Power Source
67 %
Model
67 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$184.45
#10
The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
66
Effectiveness
67 %
Accessories
67 %
Capacity
66 %
Power Source
65 %
Model
65 %
Price Comparison Last Updated (13.11.19)
Amazon Link
$3,914.93

Best Pool Heater

1. FibroPool Heating

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
97.2
FibroPool Heating
Amazon Link
Effectiveness
98
Accessories
98
Capacity
97
Power Source
97
Model
96
best offer for today
Amazon Link
$1,649.95
Pros:

It doesn’t make a lot of noise

You can easily assemble and disassemble it

It gives you a lot of savings on your electric bill

Cons:

It has limited features

The first on our list is this compact but efficient heater. If you are looking for a heater that you can easily install and conveniently use for your private pool or spa, this is the one for you. It is also durable and it does not make a lot of noise. You can also assemble and disassemble it without much fuss, you don’t have to be a pro to do it.

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Features
This pool heater is compact despite it's fairly heavy weigh in. It was designed for medium-sized above ground pools and also in-ground pools up to 10,000 gallons. It is designed to be easily detachable so you can assemble and disassemble at any time. It is also energy efficient so it’s light on your budget.

Effectiveness
It boasts 55,000BTU/hour heating capacity; it is suitable for almost any pool. With a 5.92 COP, it is considered to be of the highest efficiency.

Accessories
This item includes a hose and union adapters.

Capacity
It can heat up to 10,000-gallon in-ground swimming pools or tubs. For above ground pools, it works best with 21' round or 15' x 30' oval shape.

Power Source
This unit exclusively uses 12-gauge, 220 Volt circuit. It is important to note that this unit is not compatible with 110 Volt.

Model
Its model is FibroHeat K55.

Portability
It can be connected to any outlet with 220 volts. It can be assembled and disassembled anytime, anywhere. It does weigh 150-pounds, but its size is not overwhelming.

2. Pentair 460792

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
94
Pentair 460792
Amazon Link
Effectiveness
96
Accessories
95
Capacity
94
Power Source
93
Model
92
best offer for today
Amazon Link
$1,749.95
Pros:

You can control the temperature with a manual setting.

It is eco-friendly.

It can detect problems with its self-diagnostic feature.

Cons:

The indicator could have been placed in a more convenient location.

Our second pick is another one for small to medium sized pools. This heater is a natural gas heater that allows you to switch conveniently from fresh air circulation to heat, so you can heat up your pool in no time. You can assemble and disassemble it conveniently for party options or if you just feel like storing it for a time.

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Features
This pool heater makes you heat your pool in just a few minutes because of its uses a pre-mix system; what it does is it speeds up the heating by mixing gas with air.

Effectiveness
It has 200,000 BTU’s. It has an easy to operate digital control panel with certified low emission.

Accessories
This has a CFM 1200 blower included.

Capacity
This product has a capacity of BTU Output 175,000.

Power Source
This makes use of amps 120/20 and direct spark ignition.

Model
The model of this product is B002FQJ141 – 460792.

Portability
It has a quiet and efficient duct option so you can easily set it up in tents and parties.

3. Hayward Glc-2p-A

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
90
Hayward Glc-2p-A
Amazon Link
Effectiveness
92
Accessories
91
Capacity
90
Power Source
89
Model
88
best offer for today
Amazon Link
$279.00
Pros:

It is very easy to set up and get running in no time.

The overall efficiency is top rated.

It is very economical.

Cons:

It looks a little too flimsy and should be handled with real care but the performance is really good.

Now, this is the best way to go if you really want to save on energy. We all know that solar-powered mechanism is very reliable and gives you results. This unit comes with a heating control system that lets you set the desired temperature and also switch to cooling when necessary. This heating system is so easy to install, it’s a no-brainer with very clear instructions.

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Features
It is very compact and small but will provide heating in an instant, so you save more energy! It comes with a 3-way valve, actuator, and sensors. It has LED indicators and automatic switching. It is easy to operate.

Effectiveness
It has LED indicators with automatic switching. It has recirculation freeze protection and an installer that allows it to be compatible with other systems.

Accessories
It comes with 2 pcs 2 - 1/2 inch 3-way valve and 2 PC sensors

Capacity
This has a capacity of 8500 gallons; heats up to 80 degrees to 84 degrees.

Power Source
It can maximize heat collected from solar power by actuating a 24V valve.

Model
The model of this item is Hayward GLC-2P-A.

Portability
This is quick to set up. It is accurate and easy to control.

4. Ecosmart Tankless

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
86
Ecosmart Tankless
Amazon Link
Effectiveness
88
Accessories
87
Capacity
86
Power Source
85
Model
84
best offer for today
Amazon Link
$451.57
Pros:

It is compact and it doesn’t take up a lot of space.

It is multi-functional.

It has the ability to heat up to 2 gallons of water per minute so it can save energy

Cons:

You need a restrictor to install it.

There is a condition to the 2-year warranty, so you can’t install it by yourself upon purchase.

This pool heater that we checked is compact and very easy to install on new pools or existing ones. It is also very convenient because you just set the temperature you want and it will just do its job. This can also act as an alternative or booster pump.

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Features
It uses the latest technology called flow sensor which reduces the risk of overheating. It is designed to achieve maximum control and consistency in heating pools.

Effectiveness
This unit puts out 92,150 BTU/hour. It has a digital thermostat control for easy setting. It offers a lifetime warranty. The components are made of copper and stainless steel.

Accessories
The item has everything you will need to set up the heating device. However, you will have to purchase piping to connect the heating panels and your pool.

Capacity
It is ideal for small and mid-sized swimming pools.

Power Source
It runs on 27KW, 112.5 Amps, 240 volts

Model
Smart Pool 27

Portability
It is easy to set up because of its compact design.

5. Sun-Quest Solar

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
81
Sun-Quest Solar
Amazon Link
Effectiveness
83
Accessories
82
Capacity
81
Power Source
80
Model
79
best offer for today
Amazon Link
$568.43
Pros:

It can heat your pool for up to 10 degrees.

It is easy to install.

It is economical because it is solar powered.

Cons:

You should check your items carefully upon delivery because some panels may end up not fit together and you can’t but them per piece.

The rubber hoses that fit the panels can be improved.

This is another heating system for pools that you might want to check. This is also an energy saving device that you can invest in. It does the job of heating swimming pools in no time and it's also very easy to install. It is ideal for any type of pool and is compatible with your existing pumps.

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Effectiveness
The panels are “Professional Grade” which makes it reliable and durable. It has “max-flow” design on 2” OD headers so the back pressure is reduced from your pump.

Accessories
It is made of UV Protected Hi-Density polymer material. It comes with connectors to easily connect to pumps and pipes.

Capacity
This can be used for any type of pool be it inground or ground.

Power Source
It is 100% powered by the sun.

Model
The model of this product is Sunsolar Energy Technologies SQ-2210.

6. Doheny’s Solar Grid

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
76
Doheny’s Solar Grid
Amazon Link
Effectiveness
78
Accessories
77
Capacity
76
Power Source
75
Model
74
best offer for today
Amazon Link
$250.98
Pros:

It is compatible with most above-ground and in-ground pools.

It is very economical.

It has a polycarbonate cover that maximizes solar power.

The product is reasonably priced giving more value for your money.

It will last for a very long time.

Cons:

The warranty they offer is a limited warranty to only 90 days.

May need water pump to boost performance.

This is another energy-saving device for your pool that we think is a very good investment. It is one of the fastest heating systems for swimming pools and very popular due to its reliability. It is suitable for above and in-ground pools. Now you can enjoy swimming even during the colder season.

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Features
This solar panel has sturdy legs so it can attain maximum sun exposure. It can heat your pool up to 10 degrees. The solar panel will warm the water as it passes through the filter.

Effectiveness
It has a polycarbonate cover that creates a ‘greenhouse’ effect which improves the pool heating. It also has a leg that is angled at 30 degrees for maximum exposure to the sun. This includes connectors and brass fitting to ensure a leak-free connection.

Accessories
It comes with connectors and brass fittings.

Capacity
This product works basically for both inground and ground pools.

Power Source
It is 100% solar powered.

Model
The manufacturer of this heating item is Doheny's and they produce different pool supplies. This product is under the solar heating category; however, the model was not mentioned.

Portability
It is very easy to set-up anywhere. You can assemble and disassemble as needed.

7. Aquapro Vigoh77

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
71
Aquapro Vigoh77
Amazon Link
Effectiveness
73
Accessories
72
Capacity
71
Power Source
70
Model
69
best offer for today
Amazon Link
$2,499.99
Pros:

It has a cooling mode option that is very convenient.

It has self-diagnostic codes that help you assess the problems that may appear.

It is energy-efficient.

Cons:

You have to use electricity to run so it may cost more on your budget not to mention the price it costs on the market.

It may not work very well in very cold climates.

This one here is a real deal breaker! It can generate up to 75,000 BTU for a pool as big as 24,000 gallons. So if you have a huge pool and are quite skeptical about the other small, compact model; well you can definitely rely on this one.

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Features
This is the perfect pool heater for large to pools both in-ground and above ground. It is made of commercial grade titanium and designed to last. It is very quiet despite its size and capacity.

Effectiveness
This machine puts out 75,000 BTU/hour for every 24,000 gallons. It has a titanium heat exchanger, with PVC fittings and UV resistant housing that makes it resistant to the harshest climate. It has a self-diagnostic code and temperature lock-out inside the digital thermostat. It can be used to heat and cool water. It has a 1-year warranty for parts, 2-year warranty for the compressor and 5-year warranty for the Titanium Tubing.

Accessories
It comes with wires and PVC slip fittings.

Capacity
It can heat up to 24,000-gallon swimming pools.

Power Source
It operates on 230/208V.

Model
Its model is VIGOH77.

Portability
It is compatible with almost all remote system with an AHRI certification. It is easy to carry and lightweight.

8. Raypak Natural Gas

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
68.6
Raypak Natural Gas
Amazon Link
Effectiveness
69
Accessories
69
Capacity
69
Power Source
68
Model
68
best offer for today
Amazon Link
$2,484.98
Pros:

It is a very cost effective unit.

It is self-diagnostic so it’s easy to detect problems.

It is very durable.

Cons:

May not heat as fast as gas heaters.

It doesn’t last a very long time.

This is another best seller because although it looks very unassuming, it has many added features that are very useful. For one it has natural gas that allows you to enjoy swimming no matter what the weather is.

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Features
It is wind-resistant so it won’t cause any problem when it gets a little too windy. It also has a digital screen for easy setting. The system also has a built-in self-diagnostic tool that helps you detect problems with the unit. It has a rust-resistant and noncorrosive cabinet and internal parts. It has PolyTuf coating, copper-tin tube heat exchanger and polymer headers.

Effectiveness
This one here is also suitable for larger pools with a 266,000 BTU output. It very easy to use and it allows you to set the desired temperature. It has a non-corrosive body covered in polyester.

Accessories
This comes with a stainless steel tube sheet, PVC water connections, a burner tray, and a file tile.

Capacity
This can heat up large residential pools.

Power Source
This product operates on 120/240 volts.

Model
The model of this device is R266A.

Portability
This is lightweight and portable.

9. Jandy Pro Series

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
67.4
Jandy Pro Series
Amazon Link
Effectiveness
68
Accessories
68
Capacity
67
Power Source
67
Model
67
best offer for today
Amazon Link
$184.45
Pros:

It has a huge heating capacity.

It is very easy to install.

It is economical and a real value for your money.

It is environment-friendly.

Cons:

It may not last very long.

It is more expensive to operate and maintain.

Once again, one of our best picks, this pool heater is not only lightweight and compact, it is also very environmentally friendly with low NOx emission. It would look very good in your garden or even indoor pool area because it won’t take up a lot of space.

Read more

Features
This is designed with state of the art technology. It can self-diagnose and this model does not require re-plumbing and adjusting because of its retrofit option. The compact design made it easy to install, stow away or even transport.

Effectiveness
This beast generates 400,000BTU/hour. It also features a retrofit option; it is rotatable to 180 degrees for hassle-free installation.

Accessories
It has heat exchanging tubes made of a copper fin, with blower type gas and mix. It also has a surface igniter allowing steady heat transfer.

Capacity
This is ideal for larger pools with 400,000 BTU’s

Power Source
Its power source is natural gas.

Model
The model of this product is JX1400N.

Portability
Due to its 180 degree rotatable top, you can set it up conveniently anywhere in your home.

10. Lochinvar Energyrite

The rating is based on the average rating (1-100) from all the criteria in which we rated this product.
66
Lochinvar Energyrite
Amazon Link
Effectiveness
67
Accessories
67
Capacity
66
Power Source
65
Model
65
best offer for today
Amazon Link
$3,914.93
Pros:

It can heat large pools in no time saving you time and energy consumption.

It is very sturdy and durable.

It is convenient to use for both indoor and outdoor pools.

Cons:

The design is not very appealing, although it is not that important the body could be improved.

The last on our list is definitely not the least favorite. This pool heater is packed with 400,000 BTU’s ideal for larger pools. It has a durable and rust-proof body.

Read more

Features
It has a digital screen display so you can easily set the temperature. It is energy efficient and has a NOx emission that is quite low. It is rust-free and built to meet commercial standards.

Effectiveness
Another powerful machine, this one also generates 400,000BTU/hour. It features a gasket-less design so there is no need for expensive and time-consuming parts replacement. It has digital controls for easy setting.

Accessories
It comes with 2 pcs 2 inch PVC union nuts, 2 CPVC, and 2 gaskets.

Capacity
It is ideal for large residential pools, not commercial pools.

Power Source
It runs on 120/240 volts.

Model
The model of this product is ERN402.

Portability
Its size is portable enough that makes it easy to move and use it around your home.

Criteria Used for Evaluation

Effectiveness

What good is a pool heater if the water isn't warm?

Swimming is a very good form of exercise. Some people prefer to swim because it is refreshing but you lose the same amount of calories just by doing a few laps.

During the cold season, taking a dip gets a little too challenging because the water can get really cold. And a cold dip on a cold weather doesn’t sound inviting at all. But what if, the water is warm? Now, that is a different story! It becomes more relaxing, imagine that! A warm pool waiting for you at the end of the day! It will not just help you relax, it will also help soothe your body aches and pain and you will feel the stress just leaving your body and even help you get a good night’s sleep!

Accessories

Another thing you have to consider when buying a swmming pool heater are the additional accessories.

Putting aside the motor eficiency, heating capacity and voltage, that are all considered as basic features, but there are also some additional accessories that can help you make your choice. For instance, not all heaters are suitable for every pool. Also, some of the products on the list have digital control systems that allow you to change the temperature to your liking.

Capacity

The capacity of the pool will be another important factor to consider because some units are suitable for small to medium pools and some are for larger pools.

While you can make a rough estimate by way of a rough calculation, we suggest you consult with a professional to give you a sound recommendation.

When planning on installing a swimming pool usually these types of recommendation are already included but for some who already have a swimming pool and are contemplating on buying a new one or replace an old water heater, then we still think it’s best to consult a professional. For instance, if you are thinking of switching to solar panels you have to know how many panels would be sufficient for certain pool sizes. Because buying solar panels are in sets or pairs and you can’t just add one or two if you feel it is convenient.

Expert Interviews & Opinions

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Purchase Service

Once you have made up your mind on what to buy, there is one more thing you have to carefully look into and that is after purchase service. You have to carefully consider the warranty and what it covers, to avoid misunderstanding and encountering problems when claiming your warranty.

Some warranty has conditions and you have to clearly understand them. It is also important to know what the coverage is because some products offer a 1-year warranty on services, 5-year warranty on parts or limited warranty on a replacement.

You also have to know where the nearest service center is or what are the services covered when they install the system and most importantly, who and where to call if you need any assistance after the unit has been installed. Sometimes, even if they so have service centers you can go to, it may be far and inconvenient. You can check if they have home-service regardless of how far your house is.

Our list of best picks is a combination of different types of heating system for your swimming pool and we reviewed each product taking into consideration the criteria we have presented. The list should be helpful in narrowing your search, so you can enjoy warm dips and extend the swimming season for you and your family. If you are still unsure, you can continue search and read more reviews online for particular units you are inclined to buy.

Online

The advantage of buying online is that you don’t have to spend time and money trying to compare one item from the other. If you buy online, there are numerous items made available to you with all the information you need. You can even compare reviews and check all the details without leaving your home. You also get to enjoy all the same benefits of buying these machines online and sometimes with even bigger perks and discounts.

Heat Pumps

This machine use electricity to operate but it doesn’t use electricity to heat the water itself. What it does is it creates a warm air through condensation and that heat up the water as it passes through the pump. This is very much like the principle behind air-conditioning systems and refrigerators except that it’s reversed. Heat pumps are more expensive to buy but are cost-efficient in terms of operation and maintenance.

Solar Heaters

This is a combination of solar collectors, valves, pumps, and filters to create a heating system for your swimming pool. It generates power from the sun so it is very economical. It costs a lot of money to buy and install but cost less to operate. Solar heaters have become very popular not just because it is environmentally friendly but also because of its efficiency and dependability. It works by way of pumping the pool water to the filter and through the collector. The water gets heated through the power collected from the solar panels and then it is pumped back to the swimming pool.

When choosing a solar heater you have to know that there are two types; the glazed and the unglazed. The glazed panels are suitable for areas with hash climates and below freezing temperature. These type of panels are more expensive because of the materials used. The unglazed are for areas with cold but not freezing temperature. They are more affordable than glazed.

Gas Heaters

This generates power from gas or propane. It heats water by passing it through a combustion chamber; the chamber burns gas while warming the coils made of copper. When the water passes through these coils it gets warm as it returns to the pool. If the gas or propane is cheap in your area this can be a good value for your money because the operating cost will be cheaper.

Other Factors to Consider

Advanced Features

Another important factor to consider would be advanced features such as the climate where you live in.
All the types of heating system that we have mentioned are important but you have to factor in the climate in your area. These heating system that we have mentioned are all effective but they have limitations. For example, solar panels are more effective in places where you get a lot of sunlight, and while it is very effective on another season where you can get ample sunlight, during long harsh winters, perhaps you might need a backup heating system so you can continue to enjoy a warm dip in your swimming pool. It is also very important to place solar panels strategically to reap the full benefits of it or it will just be a waste of money.

Another example of limitations are gas heaters, they are not as effective in heating water during the harsh winter season. So if you are from places with really long and freezing winters, you have to choose a different and more effective heating system.

Portability

It's no shock that pool heaters don't exactly come cheap. Perhaps you are going to share the cost with a neighbor or maybe you'll just be the most popular guy when winter starts creeping in. For this reason, the portability of the unit is important. Most of these units are easy to set up, install, and use. Having the ability to load up the heater and bring it with you is life changing.

We should remind you to always check out the power source and voltage of the pool where you plan to bring it. If the pool and heater are not compatible, you will have just loaded up your 200-pound machine for no reason.

Frequently Asked Questions

q: Do solar panel heaters work at night?

a:

With a sufficient sized panel, it can store enough heat to sustain your swimming pool even though at night the solar panel can’t generate power anymore. This is assuming that your solar panels are sized correctly for your pool. Ideally, the surface area of your solar panels should match the size of your pool. It is possible to have less/smaller panels but the heating process will be slower.

q: Can I install the unit by myself?

a:

Typically, yes. Most systems are made to be user-friendly and very easy to install. Solar panels are known to be the easiest to install, assuming you have already considered where you will place them and how the sun hits your house. However, if the unit is not installed by a professional it may affect the warranty. So it is better to check your warranty limitations first.

Another reason that you may want to leave it to the professionals is the ease of mind of knowing that the machine will be running at its highest efficiency and that it will be safe. There are very strict guidelines to follow and knowing that you and your children will be safe around the machine is priceless.

q: Should I use a pool heater in conjunction with a pool cover?

a:

Great idea! A pool cover is a great addition to work side by side with your pool heater. Not only will the cover keep your pool clean, if you cover the pool when you are not using it, but the heat that you have pumped in will also have a much more difficult time evaporating. Overall, a pool cover will help to lower your electricity bill because you will have fewer degrees to conquer and as such, you will also not need to run the heater as often nor for as long.

q: What is a BTU?

a:

BTU is short for British Thermal Unit. The term is used in for air conditioning units and heaters. BTUs measure how much energy is required to heat one pound of water by one degree Fahrenheit. For the most part, you can use the number of BTUs and multiply that by ten to determine how many gallons of water the machine will successfully heat.

q: Are these units safe to use while swimming in the pool?

a:

Yes, it is safe to use a pool heater while you are swimming. The device is not actually in the pool with you, preventing danger. However, it is recommended to run the pump either regularly or at least for 6 hours before you plan on swimming. This will help to keep your electricity bills lower and also be easier on the pool heater itself. You can imagine how much warm air is pushed out of your air vents when warming the house, now imagine how much more you need to warm an entire body of water.

Sources

  1. Donna Henso, Top 10 Best Pool Heater 2018,
  2. Rebecca Armstrong, Best Pool Heaters of 2018,