Natural Gas Pool Heaters

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20

Models Considered

50

Hours of Research

2

Experts Interviewed

400

Consumer Reviews Analyzed

R egardless if you wish to increase the time period you can utilize your pool, or if you simply wish to raise the water temperature to a comfortable degree, a natural gas heater is an excellent choice. Not only do most of the unit offer flexible installation, but they are easy to utilize, as well as environmentally friendly. The maintenance and upkeep are a breeze, whereas the overall costs won’t rise too much. We’ve gathered the best units available currently, so read take a look at the article and pick the one which fits all requirements.


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Top 9 Natural Gas Pool Heaters Comparison

Photo Product Name BTU Pool Compatibility Adjustable connections Location Electronic ignition Warranty Price
Hayward H400FDN ImageBest Overall
1. Hayward H400FDN
400.000 In-ground under 1200 sq. ft., spas Indoors and outdoors 1 year
see price
StaRite SR400LP ImageEditor’s Choice
2. StaRite SR400LP
400.000 In-grounds under 4727 sq. ft., spas Indoors and outdoors 2 years
see price
Pentair 460792 Image
3. Pentair 460792
175.000 In-ground under 2069 sq. ft., spas Indoors and outdoors 60 days
see price
Raypack PR336AENC ImageBest for Saltwater Pools
4. Raypack PR336AENC
336.000 In-ground under 17.000 gallons, spas Outdoors and indoors 1 year
see price
Hayward W3H400FDN Image
5. Hayward W3H400FDN
400.000 In-ground under 1200 sq. ft., spas Outdoor and indoors 1 year
see price
Lochinvar ERN402 ImageBest for In-ground Pools
6. Lochinvar ERN402
400.000 In-ground under 3352 sq. ft., spas Outdoors and indoors 3 years
see price
Pentair 460736 Image
7. Pentair 460736
400.000 In-ground, under 4727 sq. ft., spas Outdoor and indoors 2 years
see price
Hayward H100ID1 ImageBest for Above Ground Pools
8. Hayward H100ID1
100.000 Above ground, under 18’ (round) or 12’ x 24’ (rectangular/oval), spas Outdoor only 1 year
see price
Hayward H250FDN Image
9. Hayward H250FDN
250.000 Under 750 sq. ft, spas Outdoor and indoor 1 year
see price

1. Hayward H400FDN


Hayward H400FDN
View Price on Amazon

Specifications:

  • BTU: 400.000
  • Water flow : 125GPM
  • Pool compatibility : In-ground under 1200 sq. ft., spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 37” x 24” x 29.50”
  • Weight : 197 lbs
  • Location : Indoors and outdoors
  • Warranty : 1 year




Design

Created with a low profile in mind, it has a width of 37”, a height of 24” and a depth of 29.50”. It can be installed outdoors or indoors according to your preferences, but it will require a professional for the job. Although it initially has the gas and water connections on the right side, they can be exchanged on the left, for enhanced convenience. It includes 2” by 2.5” fittings, for quick assembly, whereas its durable casing ensures it can easily resist in all kinds of weather, including rain and snow if you choose to place it outdoors.

Performance

In terms of performance, it offers excellent adaptability and water flow, as it can be employed for several pool sizes and shapes, as long as they don’t have a perimeter larger than 1200 sq. ft. It offers a generous power, of 400.000 BTUs, whereas its flow rate varies, from a 30 GPM (min) up to 125 GPM (max).

Additionally, it incorporates a cupro-nickel heat-exchange chamber which will increase its productivity as well as enhance water circulation. It can be utilized with saltwater too, as it won’t get damaged in the process, due to its high resistance to salt, low pH levels as well as high levels of chlorine.

Functionality

It offers the user a hassle-free utilization, due to its front-access panel and interface. With quick access to its circuits, you can adapt it to work for either 240V or 120V, while its circuit board includes overload protection for increased safety.
The control panel offers 3 different modes – pool/spa/standby – which enable the user to choose for what the heater is utilized. It allows the desired temperature to be imputed by using the two arrow-buttons the LCD displaying the degrees as well as any error codes, for quick troubleshooting.

PROS

  • Versatile installation
  • Hassle-free control
  • Highly adaptable
  • Low NOx emissions

CONS

Verdict

Quick to install, and hassle-free to utilize, it ensures your swimming pool water is heated to your desired temperature. It can be employed for spas, as well, whereas its low profile and detailed installation manual will help set it up correctly. However, it does require professional help in setting it up, for increased safety reasons.



2. StaRite SR400LP


StaRite SR400LP
View Price on Amazon

Specifications:

  • BTU: 400.000
  • Water flow : 120 GPM
  • Pool compatibility : In-grounds under 4727 sq. ft., spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 34” x 32” x 27”
  • Weight : 138 lbs
  • Location : Indoors and outdoors
  • Warranty : 2 years




Due to its Dura-Glas casing, which is highly resistant to elements and drastic climate changes, Sta-Rite SR400LP offers a versatile installation, as it can easily adapt to both indoors and outdoors. It offers a compact design, which means it won’t exceed 34” in length, 32” in width, and 27” in height, keeping the storage space to a minimum. It is also lighter than other units, 138 lbs providing facile maneuverability as well as hassle-free transportation.

It sports a power of 400.000 BTUs, and offers a quick and highly accessible heating. The top-placed control panel, offers up to 6 different positions for customizable performance, allowing you to choose if you wish to employ it for your pool or your spa. Highly compatible with several basin shapes and sizes, it can heat up to 4727 sq. ft., due to its cupro-nickel heat exchange-chamber. It supplies quick heating even in harsh conditions.

Additionally, the LCD will supply the temperature read-outs, whereas the indicator lights will aid in quick troubleshooting. It has low NOx emissions, making it environmentally friendly, whereas its low operational costs make it a great long-time acquisition. Custom installation is possible, according to your requirements and needs, whereas its gas connections are adjustable for increased convenience.

PROS

  • Adaptable design
  • Hassle-free installation
  • Adjustable settings
  • Low overall costs

CONS

Verdict

Due to its compact design and resistant casing, you can opt between an indoor or outdoor installation, according to your space and needs. It is highly compatible with several basins, including spas, whereas its high output ensures quick water-heating. It can withstand harsh operational conditions, including saltwater and low pH levels, and it enables customized performance according to each user’s requirements.



3. Pentair 460792


Pentair 460792
View Price on Amazon

Specifications:

  • BTU: 175.000
  • Water flow : 120 GPM
  • Pool compatibility : In-ground under 2069 sq. ft., spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 28.15” x 32.16” x 23.02”
  • Weight : 128 lbs
  • Location : Indoors and outdoors
  • Warranty : 60 days




Quick to install, even in tight spaces, Pentair 460792 allows each user to select where the unit should be installed, as it is compatible with both indoors and outdoors installation. Due to its resistant exterior, it will pass with flying colors the test of time and different climate changes, preventing its deterioration. Additionally, due to its compact design, it won’t occupy a space larger than 28.15” in height, 32.16” in depth, and 23.02” in width.

Its 175.000 BTUs are capable of quickly heating the water, whereas the cupro-nickel heating chamber will promote high-end performance even in harsh water conditions. It provides a user-friendly LCD, as well as a quick-to-access rotary dial which enables quick temperature selections. It can be employed for pools that do not expand further than 2069 sq ft, or 85.201 gallons, as well as spas and hot tubs.

Eco-friendly, it has low NOx emissions, whereas the pre-mix of air and gas ensures swift performance. Additionally, it is safeguarded against overheating and will offer trouble shooting icons to help you resolve the errors faster. It sports a quiet operation, so it won’t bother you, and it is warranted for the first 60 days after your purchase.

PROS

  • Facile installation
  • Quick heat-up
  • Highly resistant in time
  • Compatible with several basins

CONS

Verdict

The air-gas mix ensures the heating process will start quickly, lessening the waiting-time. It includes a user-friendly panel which enables the owner to quickly select the desired settings, whereas the icons will provide troubleshooting aid. It encompasses a durable heating chamber, which can work even in harsh water conditions. Although the unit is compact and resistant against weather changes, it is prone to quick deterioration if not handled with care.



4. Raypack PR336AENC


Raypack PR336AENC
View Price on Amazon

Specifications:

  • BTU: 336.000
  • Water flow : 125 GPM
  • Pool compatibility : In-ground under 17.000 gallons, spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 28” x 40” x 26”
  • Weight : 240 lbs
  • Location : Outdoors and indoors
  • Warranty : 1 year




Raypack PR336AENC provides flexible installation, which ensures you can select where you want to have it placed, indoors, or outdoors. Due to its resistant casing it can resist challenging weather conditions, wind, and rain, whereas thanks to its ProTek Shield system, it can cover a large range of swimming pools, including saltwater types, or those which have a high level of chlorine.

It is capable of outputting 336.000 BTUs, therefore providing quick heating, making it not only fuel-efficient but also energy efficient too. It incorporates an intelligent microprocessor that offers user-friendly settings, and high-detailed controls. The LCD will display the temperature enabling the user to set the desired degrees, as well as opt between having the swimming pool heated or the spa.

It offers a self-diagnose function which will aid in troubleshooting the unit in needs, whereas the self-adaptable burner compensates for gas fluctuations, for a continuous, even, operation. It is compatible with any pool remote system for increased convenience, and it is warranted for the first year of utilization.

PROS

  • Flexible installation
  • Smart, detailed settings
  • Anti-corrosion properties
  • Even, uninterrupted operation

CONS

  • Doesn’t have low NOx emissions
  • Sudden changes in the pH level might damage it

Verdict

It installs quickly, and due to its flexible nature, it can be easily placed either indoors or outdoors according to its user’s preference. It offers hassle-free controls as well as detailed operation elements, whereas its self-diagnose function will aid in troubleshooting it if any problem arises.



5. Hayward W3H400FDN


Hayward W3H400FDN
View Price on Amazon

Specifications:

  • BTU: 400.000
  • Water flow : 125 GPM
  • Pool compatibility : In-ground under 1200 sq. ft., spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 37” x 24” x 29.50”
  • Weight : 197 lbs
  • Location : Outdoor and indoors
  • Warranty : 1 year




Highly efficient, it can be utilized with both swimming pools and spas, allowing you to manually choose between the two. Due to the digital panel you’ll have no problems imputing the desired temperature, whereas its smart microprocessor will let you know through codes how you can troubleshoot it in need. The front-placed panel ensures facile service, whereas its low overall profile won’t occupy too much space.

It measures 37” in width, 24” in height and 29.50” in depth, weighing 197 lbs, so you’ll need some help moving it around. However, it ensures you can opt between an indoor and outdoor installation, thus giving you versatility in placing it. Due to its resistant outer shell, it can withstand harsh climate changes, so it won’t deteriorate due to changing weather conditions.

For faster heating it employs a cupro-nickel heating chamber which will quickly ensure the water reaches the set degrees, providing optimal flow. It has a hydraulic performance, which ensures swiftness and safety. It is compatible even with harsh water levels, like high chlorination or low pH levels, whereas its interchangeable line connections assure you won’t have to worry if you ever wish to relocate it.

PROS

  • Low NOx emissions
  • Versatile installation
  • Flexible line connections
  • Efficient operation

CONS

Verdict

Due to its flexible installation, you’ll have no problem setting it up according to your needs and requirements. It can adapt outdoors as well as indoors, whereas its smart intelligent panel supplies facile control. Environmentally-friendly, due to the low NOx emissions, it is also energy-efficient as it will quickly bring the water temperature to the imputed degrees.



6. Lochinvar ERN402


Lochinvar ERN402
View Price on Amazon

Specifications:

  • BTU: 400.000
  • Water flow : 100 GPM
  • Pool compatibility : In-ground under 3352 sq. ft., spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 22” x 41” x 25”
  • Weight : 269 lbs
  • Location : Outdoors and indoors
  • Warranty : 3 years




Highly versatile when its placing and installation is concerned, Lochinvar ERN402 offers several ways of setting it up, either indoors or outdoors. Its sturdy casing ensures weather protection, whereas the unit itself won’t occupy too much space, as it measures 22” in depth, 41” in width and 25” in height. It is a bit heavy, though, 269 lbs, so you might need help moving it around.

Although the line connections are fixed onto the right side of the unit, it provides flexibility for increased comfort. As it is, the water flow ensured reaches a minimum of 40 GPM and a maximum of 100 GPM. In case the user demands higher GPM, the unit is compatible with auxiliary pieces. Even more, it is compatible with a third-party remote control for facile utilization.

The unit is equipped with a commercial-grade heat exchanger, which ensures high-end efficiency, with quick heat distribution, as well as long-term utilization with no issues. The control panel offers soft-touch controls, with the LCD wide enough to accommodate words instead of codes for stress-less troubleshooting. It incorporates separate modes for pools and spas, as well as a temperature adjustment to suit your needs.

PROS

  • Password-lock protected settings
  • Low NOx emissions
  • Auto shut-down protocol for increased safety
  • Versatile installation

CONS

  • Heavy
  • Line connections aren’t mobile

Verdict

Flexible in both installation and utilization, it will provide you with a quick way of heating up the pool or spa water. Its controls are user-friendly, whereas the high-grade heat chamber ensures prolonged utilization with minimum time wasted.



7. Pentair 460736


Pentair 460736
View Price on Amazon

Specifications:

  • BTU: 400.000
  • Water flow : 120 GPM
  • Pool compatibility : In-ground, under 4727 sq. ft., spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 28.15” x 32.16” x 23.2” /li>
  • Weight : 120 lbs
  • Location : Outdoor and indoors
  • Warranty : 2 years




Compatible with both indoors and outdoors installation, it ensures versatility in setting it up. It has a low-profile compact design, which measures 28.15” in height, 31.16” in depth and 23.2” in width, therefore it won’t become a bother for your deck. It is also relatively lightweight 120 lbs, ensuring stress-less maneuverability and relocation, whereas due to its rust-proof exterior it can withstand hard weather conditions, without getting damaged in time.

It offers hassle-free control, due to its top-placed dashboard, which incorporates a rotative keypad for increased convenience. Setting it up is an easy process, due to the user-friendly design the panel has, as well as the large LCD. In case of troubleshooting, different icons will aid in finding and removing the problem.

It offers fast heating, thanks to its cupro-nickel heating chamber, which ensures the unit’s ability to function even with harsh water conditions, like high chlorination or low pH levels. It is energy efficient, so it won’t raise the costs too much, whereas its low NOx emissions make it environmentally friendly too. It is warranted for two years, beginning from the moment of your acquisition.

PROS

  • Versatile installation
  • Compatible with large basins
  • Hassle-free controls
  • High-quality efficiency

CONS

Verdict

Due to its user-friendly controls, it won’t be a problem setting it up according to your preferences. The controls are intuitive, and the LCD will provide self-diagnose codes in case you’ll ever need to troubleshoot it.



8. Hayward H100ID1


Hayward H100ID1
View Price on Amazon

Specifications:

  • BTU: 100.000
  • Water flow : 70 GPM
  • Pool compatibility : Above ground, under 18’ (round) or 12’ x 24’ (rectangular/oval), spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 17” x 26 5/8” x 22 ¼”
  • Weight : 74.6 lbs
  • Location : Outdoor only
  • Warranty : 1 year




Hayward H100ID1 is an ideal choice if you have an above-ground basin, that doesn’t go beyond 18’ (round), or 12’ x 24’ (oval/rectangular), or a spa. It offers an outdoor-only installation, and its sturdy casing is not only resistant to drastic climate changes, but also wind and rain. It is compact, so it won’t take too much yard space, measuring 17” in width, 26 5/8” in height and 22 ¼” in depth. Also, it weighs only 74.6 lbs, providing hassle-free maneuverability and relocation.

Due to its energy-efficient inner mechanism, it will quickly heat up, the one-piece copper heating chamber ensuring maximum efficiency. It has a power of 100.000 BTUs, therefore it won’t take too long to take the water to the desired temperature, with its control panel conveniently placed right at the top. The dial provides quick temperature adjustments, but id doesn’t show the degrees. It has reduced gas emissions, and it is warranted for the first year starting the moment you acquire it.

PROS

  • Resistant to weather changes
  • Cool-to-touch cabinet
  • Energy-efficient

CONS

  • Doesn’t provide degrees
  • Outdoor-only installation

Verdict

Due to its compact design, it won’t occupy too much space. Although it requires an outdoor installation the resistant casing will protect it from the elements, whereas the top-placed rotary dial will aid in quickly adjusting the temperature according to your wishes. However, it doesn’t come with an LCD, thus you’ll have to manually test the water to see its temperature.



9. Hayward H250FDN


Hayward H250FDN
View Price on Amazon

Specifications:

  • BTU: 250.000
  • Water flow : N/A
  • Pool compatibility : Under 750 sq. ft, spas
  • Adjustable connections :
  • Electronic ignition :

  • Size : 28” x 24” x 29”
  • Weight : 165 lbs
  • Location : Outdoor and indoor
  • Warranty : 1 year




Hayward H250FDN provides its user with fast and efficient heating due to its cupro-nickel heat-exchange chamber. Crafted for optimal performance, it is compatible with several types of pools, including those which employ saltwater, high chlorination, or low pH levels. It is capable of providing up to 250.000 BTU, which makes it ideal for covering up to 750 sq. ft.

The dual thermostat enables the users to switch between pool heating and spa heating, according to the preferences, whereas the digital control panel ensures user-friendliness as well as hassle-free utilization. It provides a flexible installation, which offers not only an indoor/outdoor placement, according to the user’s preferences, but also adaptable connections. They can be placed on the right or on the left, depending on where you wish to install it.

The low-profile design guarantees it won’t occupy too much space, as the unit measures only 28” in width, 24” in height and 28” in depth. Also, it is relatively light compared to other units, sporting 165 lbs., thus it can be relocated if the need arises. Its warranty spans on the course of an entire year, beginning as soon as you acquire the unit.

PROS

  • Flexible installation
  • User-friendly controls
  • Low NOx emissions
  • High-end efficiency

CONS

Verdict

Adaptable according to the user’s space requirements, it can be placed indoors or outdoors, as its low-profile design won’t be a bother. It offers swift controls, enabling personalized utilization. It can be employed to heat up both pools and spas, and it is environmentally friendly, due to its low NOx emissions.



Frequently Asked Questions


? How does it work?
By employing the gas, the heated chamber is warmed up to the imputed degrees. As the pool pump works, the pool water is guided through a filter, into the heater. The water borrows the heat and returns to the pool, the cycle repeating again.

? How fast is it?
Depending on the basin size as well as the heater’s power, it takes anywhere between one to three days to warm the water with up to 20 degrees. For spas it requires less time, around one hour.

? How costly is to run one?
Although natural gas is measured at $1 per therm, it might vary depending on location. Therefore, a unit that has 400.000 BTUs will reach 4 therms per hour, therefore it will require $4 per hour.

? Should I leave it on?
It is entirely up to each user. Even if the unit works all night, or you stop it and restart it the next day, the costs are the same. To preserve the water’s warmth longer, you should consider pairing it up with a pool cover.

? What is the optimal water temperature?
Although it depends on preferences and how hot the climate is, a temperature of 78 – 82 degrees F should be a comfortable choice.

? Should I use it even if the weather is hot?
It is entirely up to the user’s preferences. Some like the water to be colder than outside temperature, more refreshing, while others are not so inclined to it. Regardless of your location, though, during cold summer nights the water temperature will drop, so you might find yourself in need of a heater.



Troubleshooting

Problem Solution
It doesn’t ignite There might be several causes for this:

  • The temperature selected is the same as the water’s
  • The pump might not function correctly
  • The filters might require cleaning
  • Check the gas valve to be open
  • If your problem is still not resolved, it is better to ask for professional help.

    Water temperature doesn’t rise Check the settings and assure the input degrees are higher than the current water temperature. Check the flow and assure there’s nothing that blocks the water. If the flow is not consistent, the water will get cold faster than it heat, resulting in warmth-loss.
    Unexpected whistling This might be caused by low gas pressure. Check the gas pressure and verify it corresponds with the numbers provided in the manual. Also, check the burner orifices for clogging.
    Pilot won’t light This is due to the low gas pressure, or bad ventilation. Check the vents and remove any possible clogging or obstacles. Next check the gas pressure and adjust it according to the manual.
    It turns on and off by itself This might happen due to water flow problems. A clogged filter or a defective pump will affect the overall performance. Check for clogging and debris. If this doesn’t help, the thermostat might be the cause, in which case it will require replacing.

    Final Thoughts

    Never again will you have to stop yourself from enjoying your pool due to cold weather. A natural gas heater will quickly make the water temperature comfortable, providing swift operation and hassle-free upkeep. By now, surely, you’ve decided which unit to take home, but if you’re still unsure, let’s quickly review them.

    Best Overall Natural Gas Pool Heater : Hayward H400FDN
    Hayward H400FDN provides a steady water flow, ensuring a streamline operation and fast efficiency. It enables its user to set the desired degrees, whereas its durable heating chamber can resist and function correctly even with harsh water conditions. Its design is compact, so it won’t take too much space, whereas its installation is flexible to suit all needs.

    Editor’s Choice : StaRite SR400LP
    StaRite SR400LP is another high-quality choice you should keep in mind. Its compact design ensures versatile installation, whereas its powerful core ensures it is more than enough to cover generous pools. Additionally, its control panel is user-friendly, for increased convenience, whereas its low-emission operation ensures it is also environmentally-friendly.

    Best Natural Gas Heater for Saltwater Pools : Raypack PR336AENC
    If your pool utilizes saltwater, and you’re worried it might damage additional appliances, Raypack PR336AENC comes to your rescue. Not only does it has a durable outer casing, which makes it compatible with indoor and outdoor installation, but its ProTek Shield system ensures the inner components won’t get damaged. Additionally, it offers smart controls and intelligent diagnoses for hassle-free utilization.

    Best Natural Gas Heater for In-ground Pools : Lochinvar ERN402
    Due to their large capacity, inground pools might pose a challenge for heaters. Lochinvar ERN402, however, is up to the task, as it has a high heating power, as well as a steady water flow, which will quickly ensure the overall water temperature is achieved. The soft-touch controls enable you to input the optimal temperature, whereas its solid casing enables flexible installation.

    Best Natural Gas Heater for Above Ground Pools : Hayward H100ID1
    Not only inground pools require heating, above-ground basins, too, need your attention. Hayward H100ID1 is perfect for any above-ground pools, regardless of their shape, as it offers its user steady water flow as well as quick and streamline performance. It is compact, so it won’t bother you, whereas its automatic ignition ensures quick response and stress-less utilization.

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