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

Compatibility and installation notes

Compatibility note: 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.