Why heating matters in Southern California
Southern California pool water averages around 65–70°F by late October and drops into the low 60s through February. Comfortable swimming starts around 78–82°F. Without a heater, most pools sit unused from November through March — five months of asset you own but cannot use.
A heater extends a typical SoCal pool season to ten or twelve months. Pair it with a pool cover and you can realistically swim year-round in most inland and coastal communities.
There are three main options: solar heating, gas heaters, and electric heat pumps. Each has a different upfront cost, running cost, and behavior. None is universally best — the right choice depends on your usage pattern, budget, and what your permit requires.
Note: heating and solar are paid add-ons to the NEXA Series base package. They are not included in the from-$54,900 package price. The design review is where you size and price the right system for your specific home.
Solar heating — lowest running cost, often required by code
Solar heating uses roof-mounted panels (typically black polymer collectors) to circulate pool water through the sun and return it warmed. On a clear SoCal day, solar can raise water temperature 10–15°F above what it would otherwise be.
Upfront cost: approximately $3,000–$6,000 for a standard residential system, depending on roof area, panel count, and plumbing runs.
Running cost: near zero — solar panels use no fuel and add very little to your electricity bill beyond the existing variable-speed pump cycles.
Heat-up speed: slow. Solar is a steady supplement, not a rapid heater. It cannot warm a cold pool quickly or maintain temperature on cloudy stretches. It works best as a season-extender paired with a cover.
Title 24 and local code. California's Title 24 Building Energy Code sets energy efficiency standards for new residential construction, including pools. Many California jurisdictions require new pools to either install a solar heating system or include solar-ready pre-plumbing (stub-outs positioned so panels can be added later without major rework). Your permit may also require an automated, variable-speed pump — which is standard on every NEXA build. Because Title 24 requirements are updated periodically and vary by jurisdiction, the design review is the right place to confirm exactly what applies to your permit. The information here is general; it is not a substitute for current code review at your site.
Gas heaters — fastest warm-up, higher running cost
A gas heater (natural gas or propane) burns fuel to heat water directly. It can raise pool temperature several degrees per hour — fast enough to warm a cold spa in 20–30 minutes and bring a full pool up to temperature in a day.
Upfront cost: approximately $2,500–$5,000 installed, depending on BTU rating and gas line work.
Running cost: the highest of the three options. Natural gas rates vary, but running a 400,000 BTU gas heater for a full swim season in SoCal can add $50–$200+ per month to your gas bill depending on how cold the starting water is, how long you run it, and whether you use a pool cover. A cover can cut running costs by 30–50% by retaining heat overnight.
Heat-up speed: fast — the clear winner for rapid on-demand heat.
Best use: gas heaters are ideal for spas, where you want fast heat for short sessions, or for homeowners who swim on an unpredictable schedule and need the pool warm quickly. Many homes pair a gas heater for the spa with solar for the main pool.
Electric heat pumps — efficient middle ground
An electric heat pump does not generate heat — it moves it. It pulls warmth from the ambient air and transfers it to the pool water, working like an air conditioner in reverse. This makes it 3–5 times more efficient than a gas heater per dollar of energy input.
Upfront cost: approximately $3,000–$6,000 installed, varying by capacity and electrical panel work needed.
Running cost: moderate — lower than gas, higher than solar. A heat pump running in SoCal shoulder months might add $30–$80 per month to your electricity bill.
Heat-up speed: slow to moderate. A heat pump cannot match the rapid output of a gas heater. In cold weather (below ~50°F ambient) its efficiency drops and output falls. For SoCal winters, where ambient temperatures rarely dip below 50°F even at night, a heat pump performs well.
Best use: heat pumps suit homeowners who swim frequently on a consistent schedule and want lower running costs than gas without depending entirely on sun exposure. They work best maintaining a temperature that is set and held — not cranking up from cold for a single session.
Comparing the three options at a glance
Solar heating — lowest running cost, slow heat-up, may be code-required, relies on sun and roof space.
Gas heater — fastest heat-up, highest running cost, best for spas and on-demand use, works regardless of weather or time of day.
Electric heat pump — efficient and moderate running cost, slower heat-up, needs ambient air above ~50°F to perform well, good for consistent daily swimmers.
Many homeowners in SoCal combine options — solar panels as the primary pool heater to satisfy code requirements, plus a gas heater on the spa for fast on-demand heat. That combination covers the most use cases at a reasonable blended running cost.
What you pay to run any system depends on your local utility rates, how often you heat, what temperature you target, whether you use a cover, and your specific pool volume. The numbers in this article are honest ranges — not guarantees. Your design review can model a cost estimate for your chosen combination.
Pool covers: the cheapest heating upgrade you can make
Whatever heating system you choose, a pool cover is the single most cost-effective thing you can add. Pools lose most of their heat overnight through evaporation. A good cover — solar cover, automatic cover, or thermal blanket — cuts that heat loss dramatically and can reduce heater run time by 30–50%.
Automation matters too. NEXA pools come standard with Pentair automation, which means you can program the heater and pump schedules so the pool reaches your target temperature before you plan to swim — not after. Heating a pool on a schedule is far cheaper than heating one on demand from a cold start.
A pool cover is not included in the base NEXA package but is a straightforward add-on. Discuss options at the design review — the payback in lower running costs is real.
How to choose and what to do next
The right heating setup depends on four things: your typical swim schedule, whether your permit jurisdiction requires solar, your roof's solar exposure, and your comfort with ongoing running costs.
A Genesis-certified NEXA designer will walk through all of this at the free design review. They can assess your roof for solar feasibility, confirm what your local permit requires under current code, recommend a heater sizing for your pool volume and spa, and give you a confirmed price for the add-ons you choose.
NEXA Series pools start from $54,900 complete with Pebble Tec finish, LED lighting, Pentair variable-speed pump and automation, and Baja shelf. Heating, solar, and pool covers are priced as paid add-ons based on your selections and site.
Timeless Pools holds CSLB #1019202 and has been recognized in the Pebble Tec World's Greatest Pools program. The design review is free and covers your heating options alongside the full pool design — book it and get a number confirmed to your home.
