Picking a pool heater for an inground pool in Los Angeles locks you into years of operating costs, comfort levels, and maintenance routines. The wrong choice can mean hundreds of extra dollars every month or lukewarm water when you actually want to swim. At Discount Pool Mart, we've walked thousands of LA-area homeowners through the gas vs heat pump vs solar pool heater decision. As an authorized Hayward and Jandy dealer, we stock these units, install them, and hear the real feedback once they've run through a full season. This guide gives you our honest breakdown so you can match the right heater type to your pool, your budget, and your climate.
How We Ran This Comparison
I built this comparison around the questions customers actually ask at our counter - not the vague talking points you'll find on most national pool sites. We measured gas, heat pump, and solar heaters across six criteria that matter most when you're heating a pool in the LA basin:
- Upfront cost for the unit itself
- Monthly operating cost based on current SoCalGas and LADWP rates
- Heating speed from a cold pool to swimmable temperatures
- Energy efficiency using real performance specs (not marketing claims)
- Lifespan before you need a replacement
- Southern California climate fit - because our mild winters and 280-plus sunny days per year change the math entirely
That last point deserves emphasis. Los Angeles winter lows hover around 48°F, and daytime highs stay above 60°F through most of the year. That mild ambient air temperature reshapes heater performance in ways that nationally focused guides consistently miss.
Two specs show up constantly when shopping for a pool heater, and knowing what they mean keeps you from falling for inflated marketing numbers.
BTU Rating stands for British Thermal Unit - a measure of thermal output. One BTU raises one pound of water by 1°F. Residential pool heaters typically fall between 100,000 and 400,000 BTU. Larger pools and bigger temperature rises demand higher BTU ratings.
COP (Coefficient of Performance) measures heat pump pool heater efficiency. A COP of 6.0 means the unit produces six units of heat energy for every one unit of electricity it consumes. Higher COP equals lower cost per degree of warm water. The U.S. Department of Energy reports that heat pump pool heaters typically achieve COP values between 3.0 and 7.0 depending on conditions, per the DOE's heat pump pool heater guide.
Gas Pool Heaters: The Fastest Way to Warm Water (at a Price)
Gas pool heaters burn natural gas or propane inside a combustion chamber and pass pool water over a heat exchanger - usually copper or cupronickel - to raise the temperature fast. They remain the go-to for spas, vacation rentals, and homeowners who only heat their pool a few weekends per month.
Residential gas heaters from brands like Hayward and Jandy range from 200,000 to 400,000 BTU. At the top end, a 400,000 BTU unit can raise a 15,000-gallon pool's temperature by about 1°F every 20 to 30 minutes. No other heater type comes close to that speed.
The trade-off hits your utility bill. Natural gas prices through SoCalGas currently sit around $1.50 to $2.00 per therm for residential customers, depending on your baseline tier, per the SoCalGas rate schedule. Running a gas heater to maintain pool temperature several days a week can push monthly costs past $300 during cooler months - a pool heater operating cost comparison that catches many first-time buyers off guard.
Lifespan runs shorter than other types: expect 5 to 10 years with proper maintenance.
What Gas Heaters Do Well
- Heat water faster than any other pool heater type
- Work regardless of air temperature, cloud cover, or time of day
- Cost less upfront than heat pumps and solar systems
- Deliver quick warm-ups for spas and last-minute weekend gatherings
Where Gas Heaters Fall Short
- Carry the highest monthly operating cost, especially at current SoCalGas rates
- Last only 5 to 10 years on average
- Produce carbon emissions during operation
- Require low-NOx models in Southern California's South Coast Air Quality Management District
Heat Pump Pool Heaters: Built for LA's Climate
A heat pump pool heater doesn't burn fuel. It pulls warmth from the ambient air using a refrigerant cycle, a compressor (typically a scroll compressor in modern units), and a heat exchanger. Picture an air conditioner running in reverse: the unit absorbs free heat from outdoor air and transfers it into your pool water.
This is where the COP coefficient of performance pool heater spec becomes your best friend. A quality heat pump running in LA's mild climate can sustain a COP of 5.0 to 7.0, meaning every dollar of electricity you spend returns five to seven dollars' worth of heating energy. Hayward publishes COP values as high as 6.2 for their HeatPro heat pump line, and Jandy's heat pumps land in a comparable range.
Here is why that matters for Los Angeles specifically: heat pump efficiency drops when ambient air falls below roughly 50°F. In markets like Connecticut or the upper Midwest, that kills winter use entirely. In LA, winter lows average around 48°F and rarely hold there for long. Daytime temperatures through December and January regularly clear 60°F. A heat pump pool heater can run at strong efficiency year-round in Southern California - a fact I rarely see mentioned in the nationally oriented comparison guides that dominate search results.
Operating costs tie directly to LADWP electricity rates. Residential customers currently pay roughly $0.10 to $0.27 per kWh depending on tier and season, per the LADWP rate schedule. Because of that high COP, monthly costs for a heat pump typically land between $50 and $150 to maintain comfortable pool temperatures year-round. That's a fraction of what gas costs.
Modern inverter heat pumps adjust compressor speed to match heating demand, running quieter and drawing less electricity during maintenance heating. Lifespan ranges from 10 to 20 years - roughly double a gas unit.
What Heat Pumps Do Well
- Deliver the lowest cost per BTU among all three types, making them the most energy efficient pool heater for regular use
- Last 10 to 20 years
- Run at strong efficiency year-round during the full pool heating season LA enjoys
- Operate quietly, especially inverter models
- Produce no on-site combustion or emissions
Where Heat Pumps Fall Short
- Take longer to warm a cold pool initially (24 to 72 hours to reach target temperature)
- Cost more upfront than gas heaters
- Lose efficiency below approximately 50°F ambient air (a rare scenario in LA)
Solar Pool Heaters: Near-Zero Operating Cost, Patience Required
Solar pool heaters use solar thermal panels (not photovoltaic electricity panels) mounted on a roof or ground rack. Your existing pool pump circulates water through the panels, where sunlight heats it directly before it flows back into the pool. No compressor, no gas, no combustion.
Operating cost sits near zero because the only energy input is the electricity your circulation pump already draws. You may need a slightly larger or variable-speed pump to push water up to roof-mounted panels. If you're weighing pump upgrades, our guide on pool pump types covers single-speed, dual-speed, and variable-speed options.
Panel sizing follows a general rule: solar collector area should equal 50% to 100% of your pool's surface area. A 400-square-foot pool typically needs 200 to 400 square feet of panels, which demands significant roof or ground space with good southern exposure.
Los Angeles gets over 280 sunny days per year, making solar pool heating more practical here than in most U.S. markets. During peak sun months (April through October), a properly sized solar system can keep your pool comfortable at zero fuel cost. During winter, solar alone may not hold temperatures above 80°F on shorter, cooler days.
Solar pool heaters last the longest of any type - generally 15 to 20 years for quality panels. Federal tax incentives may apply for solar thermal installations. The Database of State Incentives for Renewables & Efficiency (DSIRE) tracks current federal and California-specific credits.
Solar Pool Heater Pros and Cons
The upsides:
- Near-zero operating cost after installation
- Longest lifespan (15 to 20 years)
- Zero emissions during operation
- Potential federal and state tax credits
- Strong fit for LA's abundant sunshine
The downsides:
- Highest upfront cost (panels, mounting hardware, potential pump upgrade, and installation labor)
- Slowest heating speed of all three types
- Output drops on cloudy or overcast days
- Requires substantial roof or ground space with proper sun exposure
Gas vs Heat Pump vs Solar Pool Heater: The Full Side-by-Side
This is the table I wish every pool owner could study before spending a dime. It condenses everything above into a single view.
| Feature | Gas Heater | Heat Pump | Solar |
|---|---|---|---|
| Heating Speed | Fastest (hours) | Moderate (24-72 hrs for initial heat-up) | Slowest (days, weather dependent) |
| Upfront Equipment Cost | $$ Lower | $$$ Moderate | $$$$ Highest |
| Monthly Operating Cost (LA) | $$$$ Highest ($200-$400+) | $$ Moderate ($50-$150) | $ Near Zero |
| Energy Efficiency | ~80-85% thermal efficiency | High (COP 5.0-7.0 in LA) | Very High (free solar energy) |
| Lifespan | 5-10 years | 10-20 years | 15-20 years |
| LA Climate Fit | Good (works in any weather) | Excellent (year-round efficiency) | Excellent (280+ sunny days) |
| Best For | Quick heat, occasional use, spas | Year-round primary heating | Eco-focused, long-term savings |
| Space Required | Minimal (equipment pad) | Minimal (equipment pad) | Large (roof or ground panels) |
| Emissions | Yes (natural gas or propane) | None on-site | None |
For most LA pool owners heating an in-ground pool on a regular basis, a heat pump delivers the best balance of operating cost, lifespan, and climate fit. That's the recommendation I give most often at our stores.
Matching the Right Heater Type to Your LA Pool
The decision boils down to how you use your pool and what you value most. Here's a framework drawn from the conversations we have with customers every week.
A gas pool heater fits if:
- You heat your pool only a few times per month or during a specific season
- You need water warm within hours for a weekend gathering
- You primarily heat a spa or spillover spa
- Upfront budget matters more than long-term operating cost
A heat pump fits if:
- You want comfortable water year-round at the lowest ongoing cost
- You swim multiple times per week
- You prefer a set-it-and-forget-it approach to pool temperature
- You want long equipment life without installing solar panels
This is the most popular choice among our LA customers, and the math backs it up. LA's mild winters, moderate LADWP electricity rates, and strong heat pump pool heater efficiency from modern inverter technology create the sweet spot for most residential inground pools.
Solar fits if:
- You have ample south-facing roof or ground space
- Zero operating cost and minimal environmental impact drive your decision
- You can tolerate slower heat-up times and slightly cooler water during overcast stretches
- You plan to stay in your home long enough to recoup the higher upfront investment
Hybrid setups work well, too. Some customers pair a heat pump with a solar pool blanket to cut overnight heat loss and trim operating costs even further. Others install solar panels as the primary system and keep a small gas heater for on-demand boost heating. Both combinations perform well in our climate.
Hayward Pool Heater and Jandy Pool Heater Lineups at Discount Pool Mart
We're an authorized dealer for both Hayward and Jandy, and we stock heater models across all three categories. Here's how the product lines break down by type.
Hayward Heaters
| Product Line | Type | Standout Features |
|---|---|---|
| Universal H-Series | Gas (natural gas / propane) | Low-NOx compliant, available from 150K to 400K BTU, polymer headers resist corrosion |
| HeatPro | Heat Pump | COP up to 6.2, scroll compressor, ultra-quiet operation, titanium heat exchanger option |
The Hayward pool heater HeatPro line is one of the most requested heat pumps we sell. Its titanium heat exchanger resists corrosion from chemically treated pool water, and the unit carries AHRI certification - a third-party performance guarantee that gives buyers an independent benchmark.
Jandy Heaters
| Product Line | Type | Standout Features |
|---|---|---|
| JXi | Gas (natural gas / propane) | Compact design, fast ignition, available from 200K to 400K BTU, low-NOx compliant |
| Jandy Heat Pumps | Heat Pump | Quiet operation, full-inverter models available, corrosion-resistant cabinet |
Both the Jandy pool heater lineup and Hayward's deliver comparable real-world performance. The best pick often depends on your pool's plumbing configuration, equipment pad space, and personal preference. Stop by any of our LA-area locations to see units side by side and get current pricing.
If you're upgrading other equipment at the same time, our comparison of robotic, suction, and pressure pool cleaners can help you choose the right cleaner to pair with your new heater setup.
FAQ: Pool Heater Types Compared
What type of pool heater is most efficient? Heat pump pool heaters rank as the most efficient type for regular use. With a COP coefficient of performance between 5.0 and 7.0 in mild climates, a heat pump returns five to seven units of heating energy for every one unit of electricity consumed. That makes it far more efficient than gas combustion and, when you factor in upfront investment payback periods, often more cost-effective than solar on a per-BTU basis.
What is the best pool heater for Southern California? For most Los Angeles pool owners, a heat pump wins the all-around comparison. Southern California's mild winters - average lows around 48°F - keep heat pumps running at peak efficiency year-round. Gas heaters remain a strong option for spa-only heating or occasional weekend use. Solar suits homeowners with ample roof space and a long-term outlook.
Are Hayward or Jandy pool heaters better? Both manufacturers carry decades of proven track records. Hayward's HeatPro and Universal H-Series compete head-to-head with Jandy's heat pumps and JXi gas heaters. Performance differences between the two brands are marginal. The better choice usually depends on your existing equipment, plumbing connections, and budget. We carry both at Discount Pool Mart, and our team can walk you through the differences for your specific pool.
How much does it cost to run a pool heater per month in LA? Gas heaters typically cost $200 to $400 or more per month depending on usage and current SoCalGas natural gas rates. Heat pumps generally run $50 to $150 per month at LADWP electricity rates. Solar pool heaters cost near-zero to operate since sunlight supplies the energy and only pump electricity adds to the bill. Actual costs vary by pool size, target temperature, and how often you swim.
Can you run a heat pump pool heater year-round in Southern California? Yes. LA's average winter lows rarely linger below the approximately 50°F ambient threshold where heat pump efficiency starts to drop noticeably. Most of our customers keep their heat pumps running through December, January, and February and enjoy comfortable pool temperatures all year.
What pool heater BTU rating do I need? BTU needs depend on your pool's volume (in gallons) and the temperature rise you want. As a rough guide, a 15,000-gallon inground pool targeting a 20°F rise benefits from a gas heater rated at 300,000 to 400,000 BTU or a heat pump rated at 100,000 to 140,000 BTU. Our team can calculate exact sizing when you share your pool dimensions.
Do solar pool heaters work on cloudy days? Solar thermal panels still absorb some heat on overcast days, but output drops significantly. In LA, extended stretches of heavy cloud cover are relatively uncommon, so solar heaters perform well across most of the year. Pairing solar with a backup gas or heat pump heater covers those occasional grey spells.
What brands of pool heaters does Discount Pool Mart carry? We carry gas heaters (Hayward Universal H-Series, Jandy JXi) and heat pumps (Hayward HeatPro, Jandy heat pumps) as an authorized dealer for both brands. We also stock accessories including solar blankets and pool covers. Visit our stores or call for current inventory and pricing.
Ready to pick the right heater for your pool? Stop by any Discount Pool Mart location in the LA area to compare Hayward and Jandy heaters in person. Our team will help you match the right type, brand, and pool heater BTU rating to your setup - and we'll share current pricing so you can make the smartest investment for years of comfortable swimming.