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C-410 Marathon 18 Dual-Temp

C-410 Marathon 18 Dual-Temp

An above-ground swim spa with a swim lane and a spa zone with 4 seats and 42 therapy jets. 
ONLINE PRICE

MSRP: $44,099

$28,199
save $15,900
ADDITIONAL COUPON SAVINGS
Save an extra $700-$1,400

Spring Sales Event – Ends 4/28

FINANCE PRICE
MSRP: $44,099

$31,199

save $12,900

In-house financing – 100% approval rate 

60 months – 0% interest*
Spring Sales Event – Ends 4/28
Click below for local showroom details.
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Manufacturer’s instant rebate & sale coupon are only available to cash/credit card buyers.

Standard Features (C-410 & C-411)

  • Above-Ground Swim Spa: An above-ground swim spa with a hot tub zone and a swimming lane.
  • User-Friendly Touchscreen Controls: Sleek, easy-to-use touchscreen controls.
  • Multi-Layered Fiberglass Reinforcement: Reinforced fiberglass construction delivers superior strength and long-term durability.
  • Heat Flow Manifolds: Efficient system captures and distributes heat to enhance performance.
  • Insulated Cover: Energy-efficient insulated cover helps retain heat and protect the swim spa when not in use.
  • 100% Anti-Fungicide Plumbing: Prevents bacterial buildup in plumbing lines for cleaner water and reduced chemical use.
  • User-Friendly System Controls: Simple, intuitive controls for managing temperature and swim settings.
  • ABS Bottom Protection: Shields the spa from moisture, pests, and ground contact.
  • Catalina Skirting: Stylish exterior skirting with long-lasting durability.
  • Integrated Energy Efficient Technology: Reduces operating costs while maximizing performance.
  • Made in the USA: Expertly crafted with quality materials and trusted workmanship.
  • 3 River Jets: Three powerful river jets for continuous in-place swimming.

Premium LED Lighting Package

  • 8 LED Backlit Fountains
  • 8 LED Side Lights
  • LED Step Lights
  • 24 LED Perimeter Lights
  • 2 LED Backlit Waterfalls

Swim Side Features

  • Two Stainless Steel Exercise Bars: Heavy-duty bars for workouts and resistance training.
  • Standing Body Massager: Targets key muscle groups for therapeutic relief.
  • Swim Lane & Water Line Tile: Premium ceramic tile options (Mayan Copper, Navy) and glass tile options (Blue Steel, Gold Iridescent Bronze).
  • ClearView H-500 Ozonator: Improves water clarity and reduces chemical use.
  • UV Sanitation System: Enhances water purification for a cleaner swimming environment.
  • 100 Sq. Ft. High-Performance Filtration: Large-capacity system ensures superior water clarity.
  • Auxiliary Control Panel: Convenient secondary access to spa functions.

Hot Tub Side Features

  • Four-Person Seating: Ergonomic seating for up to four people.
  • 24 Jets: Powerful hydrotherapy jets for relaxation.
  • Fixed See-Through Divider: Separates zones while maintaining an open feel.
  • Premium Lighting Package: Includes underwater and perimeter lighting plus 2 LED backlit fountains.
  • Therapy Seating: Comfortable seating for targeted hydrotherapy.
  • Neck, Shoulder, Calf & Foot Jets: Full-body therapeutic coverage.
  • UV Sanitation System: Helps maintain cleaner, clearer water.
  • H-100 Ozonator: Enhances water purification and clarity.
  • Bluetooth Water-Resistant Audio System: Built-in speakers and subwoofer for immersive sound.
  • 2 LED Cabinet Lights (End Panels): Enhances exterior appearance and nighttime visibility.
  • 100 Sq. Ft. High-Performance Filtration: Ensures superior water cleanliness.

Available Upgrades

  • AnyTemp® Hot and Cold Spa System
  • Swim Pole & Harness System
  • (3-Pack) CopPure Filters
  • Swim Spa Steps
  • Spa Booster Seat
  • Spa Startup Chemical Kit
  • (3-Pack) Nature2 Spa Water Purifier
  • Rechargeable Floating Drink Station
  • Fresh Water Mist System
  • Balboa SmartSwim™ (Not available on 4 pump swim spa models)
  • Row Kit:
    • Includes a rowing kit
    • Two resistance bands for arms (2)
    • Two resistance bands for legs (2)
    • Attach at the wrists and ankles
Swim Spa Accessories

Discover pioneering swim spa technology

UVSanitationSystem

UV Sanitation System

The advanced UV sanitation system technology helps maintain cleaner, clearer water, reducing chemical demand.
CustomCeramicTile

Custom Ceramic Tile

Choose from a variety of custom ceramic tile options to define the swim lane and waterline,
enhancing the swim spa's design.
MultiZoneSwimSpas

Multi-Zone Swim Spas

Multi-zone layouts provide a personalized wellness experience, with dedicated areas for swimming,
relaxation, and targeted massage.
VariousLightingPackages

Various Lighting Packages

Various lighting packages enhance the aesthetics and ambiance of our swim spas,
offering a personalized experience.

FAQ

Q: Does Whisper Outdoor sell swim spas?

A: Yes. Whisper Outdoor offers a full range of swim spas through the Catalina brand, including the Swim Series, Dual Temp Series, and Pool Series. Swim spas combine the relaxation benefits of a hot tub with the ability to swim in place against a current, making them a year-round exercise and therapy solution that fits in a fraction of the space of a traditional pool.

Q: How much does a swim spa cost at Whisper Outdoor?

A: Swim spas at Whisper Outdoor generally range from approximately $13,000 to $45,000, with most models falling in the $20,000 range. Because LPI sells them factory-direct, prices are significantly lower than comparable swim spas from brands like Endless Pools, Master Spas, or TidalFit. Instant factory rebates and periodic promotional coupons are available to reduce costs further. Financing options include 0% APR for up to 60 months when available as part of current promotions.

Q: What is the most popular swim spa at Whisper Outdoor?

A: The Catalina C-210 Malibu (12.6’ Fitness Series) is the #1 best-selling swim spa. It’s a portable model that delivers a full aquatic workout and hydrotherapy experience in a 12.6-foot footprint — great for buyers who want swim spa benefits without the size and cost of a full dual-temp unit. The Catalina C-420 Marathon 21’ Dual Temp is the #2 best seller — a premium dual-temperature swim spa that features separate spa and swim zones, each with independent temperature controls, built-in chiller capability, and a full suite of luxury features.

Q: What is a dual-temp swim spa?

A: A dual-temperature swim spa has two separate zones — a heated spa side for soaking and hydrotherapy (typically 100–104°F) and a swim/exercise side that can be kept at a cooler temperature for swimming, aquatic fitness, or even chilled for cold plunge therapy. Catalina’s Dual Temp models feature independent controls on each side, allowing you to maintain different temperatures simultaneously. This gives you the benefits of a hot tub, swim spa, and cold plunge all in one unit.

Q: How do Whisper Outdoor swim spas compare to Endless Pools or Master Spas?

A: Whisper Outdoor’s Catalina swim spas are manufactured by one of the largest swim spa producers in the United States and include premium features like touchscreen controls, Balboa SmartSwim™ technology, river jets, UV sanitization, and LED lighting packages. Because they’re sold factory-direct through Whisper Outdoor’s company-owned stores, buyers avoid the dealer markup that drives up prices on Endless Pools, Master Spas, and similar brands. The result is comparable or superior features at a significantly better value.

Frequently asked questions

A swim spa is a long, rectangular spa that combines the swimming benefits of a pool with the hydrotherapy and convenience of a hot tub. A powerful current at one end lets you swim continuously in place — no wall to flip off, no laps to count — while the other end functions as a traditional hot tub with jets and seating. Swim spas are popular because they deliver year-round swimming, fitness, hydrotherapy, and recovery in a fraction of a pool’s footprint and cost.
A swim spa offers most of what a pool does at a fraction of the cost, footprint, and maintenance burden. Pools require excavation, permits, decking, separate heaters, and seasonal opening and closing. A swim spa installs above-ground in a fraction of the time, runs year-round (including in cold climates), uses far less water, and combines swimming, hydrotherapy, and hot tub functions in a single unit. For most homeowners, a swim spa delivers the lifestyle benefits of a pool without the ownership burden.
Whisper Outdoor swim spas typically range from around $15,000 for compact single-zone models to $30,000+ for premium dual-zone units with full swim currents, hydrotherapy seats, and cold-zone capability. Because we manufacture our swim spas in Tennessee and sell factory-direct through our own showrooms, our pricing typically runs significantly below comparably equipped swim spas sold through traditional dealer networks. Most swim spa buyers finance through one of our three financing paths to spread the cost into manageable monthly payments.
Yes — and that’s one of the main reasons people choose swim spas over pools. Swim spas are insulated, heated, and built for year-round use in any climate. The water stays at your preferred temperature 365 days a year, so you can swim, do hydrotherapy, or relax whether it’s 90 degrees or below freezing outside. Many owners report using their swim spa more often in winter than summer.
Swim spas typically range from about 12 feet to 21 feet in length. Shorter models (12–14 ft) are ideal for fitness swimming, hydrotherapy, and households with limited space. Mid-size models (14–17 ft) offer more swim distance and often include separate hot tub seating. Larger dual-zone models (17–19+ ft) feature a dedicated swim zone and a separate hot tub zone, ideal for households who want a complete wellness solution.
Every Whisper Outdoor swim spa is designed and manufactured in Tennessee, USA — in the same facilities where we build our hot tubs, golf carts, and UTVs. American materials, American labor, and direct factory oversight on every unit. Building in-house gives us complete control over quality and means warranty service goes directly through the manufacturer, not a third-party dealer.
Swim spa delivery is more involved than a hot tub but far simpler than building a pool. Most swim spas install above-ground on a level concrete pad, deck, or properly prepared base — no excavation required. Our team coordinates delivery directly to your home, and your local Whisper Outdoor showroom can help connect you with installation resources in your area. A licensed electrician will be needed for the 220V hookup; the rest is typically straightforward.
Because swim spas are a larger purchase, our extended financing terms make a meaningful difference. We offer three financing paths: in-house financing with a 100% approval rate and terms up to 84 months — meaningful for higher-ticket purchases — plus third-party financing through Wells Fargo and promotional 0% APR offers when available. Most applicants receive a decision within 1 business day of applying online.

Exclusive savings awaits

Save up to $3,000 on swim spas during our
May Clearance Event
Ends 5/31

Special financing for all credit types — low monthly payments, easy approvals. Get your personalized savings sent straight to your inbox.

Get your exclusive Savings

Resort-level wellness, factory-direct pricing.

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Exclusive savings awaits

Save up to $5,000 during our
May Clearance Event
Ends 5/31
Special financing for all credit types — low monthly payments, easy approvals. Get your personalized savings sent straight to your inbox.

Get your exclusive Savings

A few seconds – and your exclusive savings are on the way.

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