Local Showroom

Select Store

Local Showroom

Select Store

Home
C-430 Marathon 21 Tri-Temp

C-430 Marathon 21 Tri-Temp

A premium, above-ground swim spa with three zones for a cold plunge, a hot tub, and a swim lane.
ONLINE PRICE
MSRP: $59,999
$39,999
Save $20,000
ADDITIONAL COUPON SAVINGS
Save an extra $900-$3000
June Clearance Event – Ends 6/30
GET COUPON
FINANCE PRICE
MSRP: $59,999
$44,199
Save $15,800

In-House Financing
100% Approval Rate

Special Financing
60 months 0% interest*
June Clearance Event – Ends 6/30
APPLY NOW
Click below for local showroom details.
Loading...
Search
Number Of Shops:
PRINT
Request A Quote

*60 months no-interest financing available to well-qualified buyers.

Manufacturer’s instant rebate & sale coupon are only available to cash/credit card buyers.

Standard Features

  • Premium Lighting Package: Includes underwater, perimeter, fountain, jet, backlit cup holder, and waterfall lighting for a fully immersive spa experience.
  • SpaTouch 3 Digital Control Panel: Easy-to-use control system for all spa functions.
  • Multi-Layered Fiberglass Reinforcement: Provides exceptional strength and long-term durability.
  • Insulated Cover: Energy-efficient cover helps retain heat and protect the spa.
  • Heat Flow Manifolds: Efficient system captures and distributes heat for improved performance.
  • UV Sanitation System: Enhances water purification for cleaner, clearer water.
  • 100% Anti-Fungicide Plumbing: Prevents bacterial buildup for cleaner water and reduced chemical use.
  • User-Friendly System Controls: Simple controls for temperature and swim settings.
  • ABS Bottom Protection: Shields spa from moisture, pests, and ground contact.
  • Integrated Energy Efficient Technology: Reduces operating costs while maximizing performance.
  • Made in the USA: Built with quality materials and trusted workmanship.

Swim Side

  • 42 Stainless Lit Jets: Designed with 42 stainless jets for hydrotherapy and visual appeal.
  • 4 River Jets: Powerful jets for continuous in-place swimming.
  • Floating Crystal Balls: Two decorative floating crystal accents enhance ambiance.
  • ClearView H-500 Ozonator: Improves water clarity and reduces chemical use.
  • Exclusive Swim Spa Accessories (Tri-Therapy Swim):
    • Dual Stand Up Body Massagers
    • Swim Tether Pole Base
    • Komin Mat on Foot Well and Steps
    • Row Kit with Exercise Resistance Band Therapy
    • Standing Body Massager
    • Stainless Steel Exercise Bar
  • 100 Sq. Ft. High-Performance Filtration: Ensures superior water clarity and cleanliness.

Spa Side

  • Four-Person Seating: Comfortable seating for up to four people.
  • 31 Jets: Powerful hydrotherapy jet system.
  • Pop-Up Waterfalls: Three waterfalls create a soothing sound and visual effect.
  • Standard Foam Insulation: Improves heat retention and energy efficiency.
  • Comfort Cushion Headrests: Provides neck and head support for relaxation.
  • Bluetooth Water-Resistant Audio System: Built-in speakers and subwoofer for immersive sound.
  • Control My Spa (CMS) Module: Simplifies spa system management.
  • ClearView H-100 Ozonator: Reduces contaminants and chemical use.

Cold Tub Side

  • One-Person Seating: Solo cold plunge design.
  • 12 Jets: Targeted hydrotherapy jets for recovery.
  • Comfort Cushion Headrest: Provides enhanced comfort during use.
  • Extreme Foam Insulation: Maximizes temperature retention and efficiency.
  • 120V 1 HP Chiller: Powerful cooling system for consistent cold therapy.

Product Information Sheet

Technology

Product Highlights

FAQs

Swim Spa Accessories
Product information sheet

Product Highlights

Stainless Interior Lit Jets

Bluetooth Water Resistant Audio System

Interior Tile Design

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 during our June Clearance Event Ends 6/30

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.

"*" indicates required fields

This field is for validation purposes and should be left unchanged.
First Name*
Last Name*
Opt-in
This field is hidden when viewing the form
This field is hidden when viewing the form
This field is hidden when viewing the form

Exclusive savings awaits

Save up to $3,000 during our June Clearance Event Ends 6/30

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

Get your exclusive Savings

Your next day on the water starts here. 

"*" indicates required fields

This field is for validation purposes and should be left unchanged.
Opt-in
This field is hidden when viewing the form
This field is hidden when viewing the form
This field is hidden when viewing the form

Exclusive savings awaits

Save up to $1,800 during our June Clearance Event Ends 6/30
Special financing for all credit types — low monthly payments, easy approvals. Get your personalized savings sent straight to your inbox.

Get your exclusive Savings

Built for what’s out there.

"*" indicates required fields

This field is for validation purposes and should be left unchanged.
Opt-in
This field is hidden when viewing the form
This field is hidden when viewing the form
This field is hidden when viewing the form

Exclusive savings awaits

Save up to $5,000 during our June Clearance Event Ends 6/30
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.

"*" indicates required fields

This field is for validation purposes and should be left unchanged.
Opt-in
This field is hidden when viewing the form
This field is hidden when viewing the form
This field is hidden when viewing the form