Hydro Systems 2 Button Thermal Air System

Restore the full Thermal Air experience of your tub without the guesswork or risk of used parts. This ready-to-install retrofit from Whirly Bros is designed to upgrade a discontinued Legacy Hydro Systems 2 Button Thermal Air System with fresh, factory-new hardware. It's engineered to bring back precise control, reliable power, and modern electrical standards while keeping downtime to a minimum.

Why this retrofit stands out

• Compact 120V 60Hz Control Box delivers steady, code-aligned power to the thermal air system, reducing nuisance outages and ensuring consistent performance.
• Variable-Speed 3-Button Keypad with a 2.5" square trim and built-in 3M adhesive backing for a clean, professional install that neatly covers the old mounting hole.
• 6-foot interconnect cable provides flexible routing inside the cabinet or spa area, so you don't have to reshuffle the entire setup to accommodate the new hardware.
• 20-Minute Timer adds precise control over bath duration—great for routine hydrotherapy, family baths, or a relaxing soak without second-guessing the timing.
• Air-Flow Compatibility pairs with a compatible air blower (sold separately) for a cohesive, integrated feel that mirrors your tub's original performance.
• 2.5" trim replaces a 1-1/2" opening with a clean, tidy finish, reducing wall modifications to a minimum.

Key benefits you'll notice

• Reliable, factory-new components replace aging or discontinued parts, lowering the risk associated with sourcing secondhand units.
• Simple, straightforward installation that fits into your existing wall opening, often without major remodeling.
• Enhanced control with multiple speed settings, plus wave and pulse modes for a personalized spa experience.
• Intuitive operation that's easy for homeowners, service techs, and property managers—uptime matters in every setting.

What's included

• 1 x 120V 60Hz Compact Control Box
• 1 x Variable-Speed 3-Button Keypad (2.5" square trim) with 3M tape backing
• 1 x 6-foot interconnect cable

Need an Air Blower?

Air blower sold separately. Click here to add a compatible blower to your order.

Compatibility and installation notes

An air blower can be added separately to complete the system. The kit is designed to pair seamlessly with existing spa plumbing and electrical, delivering a cohesive upgrade without overhauling the tub's footprint.

Who this is for

• Homeowners seeking a hassle-free retrofit to restore Therma Air or Hydro Systems functionality without replacing the entire tub.
• Spa technicians performing quick, reliable replacements for discontinued 2-button systems.
• Property managers or vacation-rental owners who want durable, up-to-date controls with minimal maintenance.

Use cases and practical scenarios

• Replacing aging 2-button keypads and control boxes to restore full thermal air functionality with new hardware.
• Upgrading to a more controllable system featuring adjustable speeds and timed sessions for consistent hydrotherapy routines.
• Covering an old 1-1/2" mounting hole with a clean 2.5" trim for a neat, professional look.

Restore your Hydro Systems experience with a retrofit built for lasting performance. It installs with minimal wall disruption, offers precise control, and delivers the reliability your tub deserves.