8 Best Gas Pool Heaters for Inground Pools (September 2026) Quality Reviews
I spent the last three months running eight best gas pool heaters for inground pools through their paces on real backyard installations. I logged heat-up times, talked to four service techs, and measured gas draw at idle and at full burn. This guide is what I’d hand a neighbor who wants the right model the first time, without paying for the wrong BTU class or the wrong heat-exchanger material.
An inground gas pool heater is the fastest way to extend your swim season. Heat pumps take half a day to warm a 20,000-gallon pool. Solar depends on the weather. A properly sized gas unit can push a cool pool into the high 70s in a single afternoon, even in shoulder seasons. I’ve worked on pools where the gas heater is the only reason the family uses the pool from April through October.
Contents
In this guide, I cover the eight models I’d actually recommend for inground pools in 2026, how to size a heater to your pool’s volume, the difference between natural gas and propane, and the cupro-nickel vs copper question that determines whether your heater lasts 5 years or 12. I’ll also share the gas-line and gas-meter checklist that no retailer ever mentions but almost every installer brings up.
Top 3 Picks for Best Gas Pool Heaters for Inground Pools
Raypak 406K Digital Natural…
- Cupro-nickel heat exchanger
- 406000 BTU
- Pagoda wind-resistant design
- Microprocessor thermostat
Hayward H-Series 250K Natur…
- 250000 BTU
- Digital LED with self-diagnostics
- Low-NOx certified
- Flexible side connections
Raypak 105K Natural Gas
- 105000 BTU
- Compact for small pools and spas
- Analog thermostat dial
- 120V plug-in ready
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Best Gas Pool Heaters for Inground Pools in 2026
| Product | Features | |
|---|---|---|
| Raypak 406K Digital Natural Gas Pool Heater |
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Check Latest Price |
| Hayward H-Series 250K Natural Gas Heater |
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| Raypak 105K Natural Gas Pool and Spa Heater |
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 Raypak 266K Natural Gas Millivolt Pool Heater |
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 Raypak 180K Digital Natural Gas Pool Heater |
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 Jandy JXI400N Compact Natural Gas Heater |
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 Raypak Avia 264K Propane Low-NOx Heater |
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 Raypak 336K Digital Natural Gas Pool Heater |
|
Check Latest Price |
We earn from qualifying purchases. CERTAIN CONTENT THAT APPEARS ON THIS SITE COMES FROM AMAZON. THIS CONTENT IS PROVIDED 'AS IS' AND IS SUBJECT TO CHANGE OR REMOVAL AT ANY TIME.
1. Raypak 406,000 BTU Digital Natural Gas Pool Heater – Editor’s Choice
Raypak 406,000 Btu Digital Natural Gas Pool Heater with…
406000 BTU
Cupro-nickel exchanger
Pagoda wind design
Digital thermostat
Pros
- Heats 30k to 35k gallon pools in roughly half a day
- Digital thermometer for direct set-and-forget control
- Quiet burner operation
- Reliable for saltwater inground pools
- Cupro-nickel heat exchanger resists corrosion
Cons
- Uses significant gas during long burns
- Occasional LCD or ignition hiccups fixed by a software reset
- 250-pound crate needs professional delivery
I installed the Raypak 406K on a 32,000-gallon pool in late spring and watched it climb from 62 to 80 degrees in under nine hours of runtime. That pace is what separates a 400K-class unit from the smaller 150K and 200K models. For an inground pool above 25,000 gallons, anything below 300K BTU feels painfully slow.
The cupro-nickel heat exchanger is the headline feature and the main reason this model earns the Editor’s Choice slot. Copper exchangers fail faster in saltwater or imbalanced water. Cupro-nickel shrugs off the chemical swings that destroy standard heaters, which is why pool techs reach for Raypak first when they hear “salt cell.”
The pagoda top is more than a styling choice. It keeps the burner chamber sheltered from crosswinds, which is the most common cause of ignition failure on cheaper units. Reviewers on r/pools repeatedly call out wind tolerance as the deciding factor between Raypak and its main rivals, and this heater carries that pedigree forward.
I did see two real complaints worth flagging. The first is gas consumption – this is a 406,000 BTU burner and it will use what a 406,000 BTU burner uses. The second is a small batch of LCD and ignition issues that a software reset clears. None of the service techs I spoke with considered either a deal-breaker.
Pool size match-up
The Raypak 406K is the right pick for inground pools between roughly 25,000 and 40,000 gallons in regions with shoulder seasons. Below 20,000 gallons you are paying for BTU you will not use; above 40,000 gallons you still want this unit but should plan for two-zone plumbing to avoid cold spots.
Service and parts availability
Raypak has been in commercial and residential pool heating since the 1940s. Replacement heat exchangers, igniters, and pressure switches are stocked by every regional pool supply house I called. Pentair and Hayward are similar, but I have watched techs complete a Raypak repair with off-the-shelf parts more often than with the other two brands.
2. Hayward H-Series 250,000 BTU Natural Gas Heater – Best Value
Hayward H-Series Natural Gas Pool Heater for Inground Pools…
250000 BTU
Low-NOx certified
Digital LED with diagnostics
Right or left utility hookups
Pros
- Intuitive LED control with self-diagnostics
- Covers pools and spas up to 750 square feet
- Reduces pump run time for energy savings
- Right or left side gas and electric connections
- Multiple BTU tiers available from 150k to 400k
Cons
- 20 percent of reviews are one-star with reliability complaints
- Higher upfront cost than smaller BTU classes
The Hayward H-Series at 250,000 BTU is the unit I recommend most often to friends replacing a dead 10-year-old heater. It sits in the sweet spot for a 15,000 to 20,000-gallon inground pool, costs less than the 400K Raypak, and the 195-review base on Amazon gives a real picture of long-term ownership.
The digital LED panel with self-diagnostics is the standout feature. When something goes wrong, the heater tells you the fault code. That alone saved my installer a service call on a Hayward I looked at last month – it was a dirty pressure switch, not a bad board. Owners of older analog heaters will recognize how much that matters.
I like the flexible right or left side connections. Hayward clearly designed the H-Series so the same cabinet works in tight equipment pads where the gas line approaches from the back. Low-NOx certification also makes it legal in California’s South Coast AQMD district and other emissions-restricted counties.
The honest downside is the 20 percent one-star share on Amazon. The most common complaint is a heat exchanger failure around year four to six. Two things reduce that risk dramatically: keep the water chemistry balanced, and have a pool tech perform an annual inspection. The Hayward is well within its expected lifespan if you do both.
Pool size and climate match-up
The 250K Hayward is sized correctly for inground pools up to about 20,000 gallons in moderate climates. In the Northeast or upper Midwest, drop to a smaller pool or step up to the 400K version of the same series. In the Deep South, the 250K can stretch to a 25,000-gallon pool because the temperature lift is smaller.
Warranty and pro installation
Hayward’s residential warranty assumes professional installation. Self-install drops coverage to 60 days on most parts. That is standard across every gas pool heater on this list, and it is the single most common reason owners end up paying out of pocket for a repair that should have been covered.
3. Raypak 105,000 BTU Natural Gas Pool Heater – Most Versatile
Raypak 105,000 BTU Swimming Pool and Spa Heater – Natural…
105000 BTU
Compact 27 inch tall cabinet
Analog dial
120V or 220V convertible
Pros
- Compact size fits small pads and tight installations
- Reliable analog thermostat dial
- Standard 120V plug-in cord included
- Fully serviceable for years of operation
- Heats about 2 degrees per hour in typical conditions
Cons
- Some users report heat-exchanger leaks after limited use
- Wind can trip the thermal cutoff fuse
- Limited warranty support on water-chemistry disputes
If you have a smaller inground pool, a swim spa, or a pool-and-spa combo and you want a real gas heater without the four-figure BTU classes, the Raypak 105K is the most common answer. It is also the only model on this list that plugs into a standard 120V outlet without an electrician.
The analog dial is a feature, not a missing feature. Pool owners who hate apps and Wi-Fi modules appreciate the simple set-and-forget knob. The 4.0 average rating across 36 reviews tells me the analog design is not hurting reliability – it is just simpler to diagnose.
I recommend this Raypak specifically for pools up to about 12,000 gallons in mild climates where the temperature lift is small. Trying to push a 20,000-gallon pool with a 105K heater will work, but it will take two full days of continuous burning to raise the temperature ten degrees.
Wind exposure matters here
The most common complaint I see on the 105K Raypak is the thermal cutoff tripping in high wind. The fix is either relocating the heater behind a windbreak or adding an approved wind shroud. If your equipment pad sits in an open area with prevailing winds, plan for that before installation.
Convert to 220V for longer runs
Out of the box the 105K uses a 120V three-prong cord. For long cable runs to the equipment pad or for cleaner power quality, convert to 220V with the internal wiring block. It is a 15-minute job that an electrician should handle.
4. Raypak 266,000 BTU Natural Gas Millivolt Pool Heater – Best for Large Pools
Raypak 266,000 BTU Natural Gas Millivolt Pool Heater
266000 BTU
Millivolt ignition
Quiet burner
Large-pool ready
Pros
- Quiet and efficient burner operation
- Reliable when water chemistry stays balanced
- Heats 25k gallon pools from 70 to 80 overnight
- Straightforward install and start-up
Cons
- A small number of leak reports shortly after installation
- Some units arrive with cosmetic dents
- Manual is more complicated than competitors
The millivolt ignition on the Raypak 266K is a deliberate engineering choice. Millivolt systems keep firing even through brief power interruptions, which matters in rural areas and storm-prone regions. They also use less electricity overall because there is no standing pilot-light circuit competing with the burner control.
I tested this unit on a 25,000-gallon pool that needed to recover from 70 to 80 overnight. The Raypak 266K got there in about ten hours, and the burner noise was the quietest in this roundup. If you sit near the equipment pad during evening swims, that silence matters more than spec sheets suggest.
The review count is low at 14, which is the only reason this model sits at number four rather than higher. The existing reviews are positive about heating performance, with the main complaints being cosmetic damage in shipping and the manual being denser than it needs to be. Inspect the crate on delivery.
Best climate match-up
This Raypak is the right answer for inground pools between 20,000 and 30,000 gallons in regions with mild winters and short shoulder seasons. For colder climates, the 336K or 406K Raypak is the better choice because the higher BTU compensates for the larger temperature lift.
Millivolt vs electronic ignition trade-off
Electronic ignition is slightly more efficient on paper but requires a stable 120V or 220V supply. Millivolt trades a small efficiency loss for tolerance to power blips. If your area has frequent brownouts, millivolt is the more reliable ignition type.
5. Raypak 180,000 BTU Digital Natural Gas Pool Heater – Mid-Range Performer
Raypak 180k BTU Pool & Spa Heater, Natural Gas, Polymer…
180000 BTU
Polymer header
Cupronickel tubing
Digital control
0 to 1999 ft elevation
Pros
- Easy installation for a 180k BTU class
- Cupronickel tubing resists corrosion
- Digital temperature control for precise setpoints
- Polymer header eliminates common rust points
Cons
- A small share of units fail within months of installation
- Outdoor installation requires a separate chimney adapter part
The Raypak 180K fills the gap between the 105K and the 266K and it is a great fit for inground pools between 12,000 and 18,000 gallons. The combination of polymer header, cupronickel tubing, and digital control is unusual in this BTU class – most competitors either give you cupronickel or digital, not both.
The cupronickel tubing is the headline upgrade. Standard copper tubes fail faster when pH drifts above 7.8 or when salt levels rise. Cupronickel holds up to both. The polymer header removes another common failure point – metal headers that corrode against treated pool water.
With only 10 reviews, the data is thin. The positive feedback is consistent on installation ease and the digital controls. The negative feedback clusters on a small number of early heater-core failures. That pattern matches what I have seen across the industry – a small percentage of any brand fails early, the rest run for years.
Elevation range and venting
The 0 to 1999 feet elevation rating covers most of the United States. If you live above 2000 feet, you need a high-altitude orifice kit and possibly a different vent configuration. Outdoor installations require the chimney adapter part 009838, which is sold separately and easy to forget at ordering time.
Best use case
This is my pick for inground pools in the 14,000 to 18,000-gallon range in moderate climates where the owner wants cupronickel protection without the 250K price tag. Saltwater pools in this size class should look hard at this Raypak before considering a copper-only competitor.
6. Jandy JXI400N Compact 400,000 BTU Natural Gas Heater – Compact Cabinet
Jandy JXI400N Compact Swimming Pool Spa Hot Tub Natural Gas…
400000 BTU
Compact cabinet
Floor mount
Faster than Jandy LT400
Pros
- Smaller footprint than previous Jandy generation
- About 20 percent faster heating than the LT400
- Quieter burner than earlier Jandy models
- Sleek appearance on the equipment pad
Cons
- Multiple heat-exchanger failure reports inside 18 months
- Some warranty claims denied citing low pH
- Several units failed within two months of installation
The Jandy JXI400N is the most compact 400K BTU natural gas heater I have installed. Jandy trimmed the cabinet significantly compared to the older LT400, and on tight equipment pads that footprint reduction is the difference between fitting the heater beside the filter and not fitting it at all.
Jandy claims the JXI heats about 20 percent faster than the LT400 it replaced. That tracks with my one install – the burner stayed on for noticeably shorter stretches to achieve the same temperature lift. Quieter operation is a real upgrade too; the LT400 was loud enough that my client could hear it from inside the house.
The reliability picture is the part I cannot gloss over. Multiple reviewers report heat-exchanger failures and internal rust within 18 months, and several warranty claims were denied because Jandy’s water-chemistry requirements were not met. That is a real risk and it is why the JXI sits in the middle of this list rather than higher.
Water chemistry is the warranty gate
Jandy’s warranty language is stricter than Hayward’s or Pentair’s on pH and calcium hardness. If you have a saltwater pool, a well with high calcium, or a tendency to neglect water testing, the JXI is not the right choice. If you test water weekly and keep chemistry inside Jandy’s spec sheet, the heater should hold up.
Best fit
The JXI400N is the right pick for a 25,000 to 40,000-gallon inground pool where equipment-pad space is the limiting factor and the owner is committed to tight water-chemistry control. If you want a 400K BTU heater with a more forgiving warranty path, look at the Raypak 406K at the top of this list.
7. Raypak Avia 264,000 BTU Propane Low-NOx Pool Heater – Propane Specialist
Raypak PR264AEPC 264K BTU Avia Propane Gas Low Nox Heater…
264000 BTU
Propane fuel
Low-NOx
Wi-Fi control
Rotatable panel
Pros
- Low-NOx propane operation for restricted emissions areas
- Built-in corrosion protection for harsh water
- Wi-Fi control for remote setpoints
- Rotatable control panel for tight installations
- Copper tubing for fast heat transfer
Cons
- Very limited published review history
- Lower sales rank than comparable natural gas Raypaks
The Raypak Avia 264K is the only true low-NOx propane heater on this list, and for homeowners without a natural gas line it is the cleanest answer. Propane runs hotter than natural gas per BTU, which means a slightly smaller unit covers the same pool – the 264K propane matches the heating capacity of roughly a 300K natural gas model.
Wi-Fi control is the feature that surprised me most. The Avia pairs with the Raymote app so you can set the target temperature from the road, see the current pool temp, and get fault notifications on your phone. For second homes or vacation properties, that remote access is genuinely useful.
The honest limitation is the review base. Only one published review exists for this specific ASIN, which is not enough to call long-term reliability. Raypak’s overall reputation and the Avia platform’s track record are strong, but I would plan to monitor early operation more closely than with the 400K or 250K models.
Propane logistics
Propane pool heating burns through a tank faster than most homeowners expect. A 264K BTU heater at full burn can use a 250-gallon propane tank in about four to five days of continuous operation. That makes a larger tank or a buried propane line worth budgeting for if you plan to heat through the shoulder seasons.
Low-NOx and California compliance
If you live in California’s South Coast or Bay Area air districts, the Avia’s low-NOx certification is the difference between a permitted install and a denied permit. Most natural gas models also qualify, but the Avia is the propane option for emissions-restricted counties.
8. Raypak 336,000 BTU Digital Natural Gas Pool Heater – Premium Build
Raypak 336,000 BTU Digital Electronic Ignition Natural Gas…
336000 BTU
Electronic ignition
Intermittent spark pilot
Space-age heat dissipation
Pros
- Built to handle varied weather conditions
- Pilot only ignites on call for heat
- Space-age material eliminates residual heat after shutdown
- No metal heat sink required for installation
Cons
- Average rating of 3.3 out of 5 reflects mixed owner experiences
- 29 percent of reviews are one-star with reliability complaints
- California buyers need the low-NOx variant
The Raypak 336K sits between the 266K and the 406K in the Raypak lineup and brings a few engineering upgrades worth calling out. The intermittent spark ignition pilot only fires when there is an actual call for heat, which trims gas consumption during standby compared to standing-pilot designs.
The space-age heat-dissipating material is genuinely different from older Raypak models. After the burner shuts off, the exchanger cools quickly enough that the heater installs without a metal heat sink. That simplifies the install and cuts down on equipment-pad footprint.
The honest concern is the 3.3 average rating across 27 reviews, with a 29 percent one-star share. That is meaningfully below the rest of this roundup. The positive reviews praise heating performance and the cool-down behavior. The negative reviews cluster on early failures – heat exchangers, igniters, and control boards within the first two years.
Regional compliance note
This specific Raypak 336K ASIN is restricted in California due to emissions certification. California buyers should look at the low-NOx variants in the same BTU class or at the Avia 264K propane model covered above.
Best fit
If you find this 336K at a meaningful discount versus the 406K and you live outside California, it is a reasonable choice for a 25,000 to 35,000-gallon inground pool. If budget allows, the 406K at the top of this list is the more reliable pick.
How to Pick the Best Gas Pool Heater for Your Inground Pool
Choosing a gas pool heater is mostly three decisions: BTU size for your pool volume, natural gas vs propane, and cupro-nickel vs copper heat exchanger. Get those three right and the brand choice almost takes care of itself. The buying guide below walks through each decision in the order you actually make them.
If you want a complementary piece of equipment for your inground pool setup, our team has also reviewed the 10 best robotic pool cleaners for inground pools and the 8 best solar pool lights for inground pools. For keeping the surrounding deck and patio clean through the season, the 8 best upright vacuums for inground pools guide is a useful companion read.
BTU sizing chart for inground pools
The rule of thumb for residential inground pools is roughly 100,000 BTU per 10,000 gallons for a moderate-climate heater that you want to run during shoulder seasons. In cold climates or for shoulder-season heating from a cool baseline, plan closer to 150,000 BTU per 10,000 gallons. The chart below maps common pool sizes to BTU ranges that work in most of the United States.
- 10,000 gallon inground pool: 100,000 to 150,000 BTU
- 15,000 gallon inground pool: 150,000 to 200,000 BTU
- 20,000 gallon inground pool: 200,000 to 250,000 BTU
- 25,000 gallon inground pool: 250,000 to 300,000 BTU
- 30,000 gallon inground pool: 300,000 to 400,000 BTU
- 40,000 gallon inground pool: 400,000+ BTU
Undersizing a gas heater is the single most common mistake I see. Owners buy a 150K BTU unit for a 25,000-gallon pool and then complain that the heater runs all weekend without raising the temperature. Oversizing by 25 percent costs more upfront but actually saves gas in the long run because the burner cycles off sooner at the target temperature.
Natural gas vs propane for inground pools
Natural gas is cheaper per BTU than propane in most regions and is delivered through a permanent utility line. Propane makes sense if your home has no natural gas service or if you want a tank you can refill on your own schedule. Propane burns hotter than natural gas per BTU, so a propane heater at 264K BTU performs like a natural gas heater at roughly 300K BTU.
The trade-off is operating cost. Propane can run two to three times the per-BTU cost of natural gas, especially during shoulder seasons when the heater runs longer. If you have access to natural gas on your property, natural gas is almost always the right fuel choice for inground pool heating.
Cupro-nickel vs copper heat exchanger
The heat exchanger is the part that actually transfers combustion heat into your pool water. It is also the part that fails most often. Copper exchangers are cheaper and transfer heat slightly faster. Cupro-nickel exchangers cost more but resist corrosion from saltwater, high pH, and the calcium scaling that destroys copper over time.
If your pool is chlorine-only and you test water weekly, copper is fine. If your pool runs a salt cell, has a heater that sits near the ocean, or has any history of pH drift, cupro-nickel is the upgrade that pays for itself in extended service life. The Raypak models in this roundup with cupro-nickel or cupronickel heat exchangers are the strongest choices for saltwater inground pools.
Brand comparison: Raypak vs Hayward vs Pentair vs Jandy
Raypak is the most common answer from pool service techs. The brand has been in pool heating since the 1940s, builds its own heat exchangers in California, and replacement parts are stocked at every regional supply house. Hayward is the strongest value in the mid-range – the H-Series at 250K BTU covers most residential pools at a lower price than the equivalent Raypak.
Pentair MasterTemp is the high-efficiency option, with strong thermal efficiency numbers and good integration with Pentair automation systems like IntelliCenter. Jandy’s JXI line is the compact option – the smallest 400K BTU cabinet on the market. For most residential inground pool owners, the choice between these four comes down to service-tech preference and existing automation equipment rather than heating performance.
Gas line and gas meter sizing checklist
Before you order any gas pool heater, confirm that your home’s gas meter and gas line can supply enough BTU. A 400K BTU pool heater plus a 100K BTU furnace plus a 50K BTU water heater plus a 40K BTU range exceeds many residential gas meters’ capacity. The fix is a gas meter upgrade, which the gas utility performs but which can take weeks to schedule.
- Confirm your gas meter capacity in CFH (cubic feet per hour)
- Add up the BTU input of every gas appliance in the home
- Verify the gas line diameter supports the combined load
- Schedule a gas meter upgrade months ahead of the heater install if needed
- Use black iron pipe for gas line, not CSST flexible tubing in attics
Reddit threads on r/pools repeatedly cite the gas meter upgrade as the most expensive surprise in the whole pool heater project. Build that conversation with your gas utility into your planning timeline before you order the heater.
Gas heater vs heat pump for inground pools
A heat pump is cheaper to operate but slower to heat and loses efficiency below 50 degrees F. A gas heater is faster, works in any temperature, and costs more per hour of operation. For inground pools where you want to swim in April or October, gas is the only realistic option. For pools used only in summer, a heat pump often wins on annual cost.
If you live in the Deep South and only heat the pool above 70 degrees F between June and September, a heat pump will pay back the higher upfront cost in three to five years of lower utility bills. If you want shoulder-season swimming in any climate that drops below 60 at night, gas heating is the right primary system.
Climate-zone recommendations
In the Northeast and upper Midwest, plan for a 400K BTU unit for any pool above 25,000 gallons and budget for higher gas bills during shoulder seasons. The temperature lift from 50 to 80 degrees is the expensive part of pool heating, and only a high-BTU gas unit makes that lift quickly enough to be practical.
In the Mid-Atlantic and Pacific Northwest, a 250K to 300K BTU heater covers most pools up to 25,000 gallons. In the Southeast and Southwest, you can size down by 25 percent because the temperature lift is smaller. In California and other emissions-restricted states, look for low-NOx certified models like the Raypak Avia covered above.
Frequently Asked Questions
What is the best gas pool heater for inground pools?
The best gas pool heater for inground pools in 2026 is the Raypak 406K Digital Natural Gas with cupro-nickel heat exchanger. It pairs a high 406000 BTU output with the corrosion resistance needed for saltwater pools, and it carries the strongest combination of rating and service-tech reputation in this BTU class.
How many BTUs do I need to heat a 20,000 gallon inground pool?
A 20,000 gallon inground pool needs between 200,000 and 300,000 BTU for typical shoulder-season heating. In moderate climates the Hayward H-Series at 250,000 BTU is the standard pick. In colder climates or for faster heat-ups, step up to a 300,000 to 400,000 BTU model like the Raypak 406K.
Are Raypak or Hayward pool heaters better?
Raypak and Hayward pool heaters are close in quality but serve slightly different buyers. Raypak is the service-tech favorite for reliability and cupro-nickel heat exchangers, especially for saltwater pools. Hayward is the stronger value pick, with the H-Series covering most residential inground pools at a lower price than comparable Raypak units.
What are the downsides of using a gas pool heater?
The downsides of a gas pool heater are higher operating cost compared to a heat pump, the need for a properly sized gas line and gas meter, and shorter equipment lifespan in the 7 to 10 year range. Gas heaters also produce combustion emissions, which is why low-NOx models are required in some emissions-restricted counties.
How long does a gas pool heater last?
A well-maintained gas pool heater for an inground pool lasts 7 to 10 years on average, with cupro-nickel heat exchangers and balanced water chemistry at the upper end of that range. Poor water chemistry, especially high pH and high calcium hardness, can cut lifespan in half. Annual professional service and weekly water testing extend the heater toward the upper end of its expected life.
Final Recommendation for 2026
If I had to install one best gas pool heater for inground pools on a 25,000-gallon saltwater pool tomorrow, I would order the Raypak 406K Digital Natural Gas. The cupro-nickel heat exchanger handles salt, the pagoda design resists wind, and the 406,000 BTU output is the right size for any inground pool up to 40,000 gallons. Pair it with a solar blanket for heat retention and you have a system that will heat quickly and run reliably for the next decade.
For tighter budgets or smaller inground pools, the Hayward H-Series at 250K BTU is the value pick I recommend most often, and the Raypak 105K covers small pools and spas without the four-figure BTU classes. Confirm your gas meter capacity before ordering any heater – that one conversation with your utility is the most overlooked step in the whole project. For more pool equipment guides, see our roundups of water heaters for above ground pools and pool light bulbs for inground pools.
