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Hydro Air
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Every hot tub has a handful of small controls along its rim that most people never think about. Turn one and the jets suddenly roar with bubbles. That little knob is an air control, and Hydro Air has been one of the long-standing names behind parts like it, from jet assemblies to valves and drains.
For years Hydro Air was part of ITT Corporation, with operations in North America and in Varde, Denmark. In early 2009 ITT sold HydroAir USA and HydroAir Denmark to Balboa Water Group, a maker of spa control systems, and the business became HydroAir International, a division of Balboa. Hydro Air's product range at the time included jet assemblies, drains, valves, suctions and air controls for whirlpool baths and hot tubs. In 2020 Helios Technologies agreed to buy Balboa Water Group for $218.5 million, bringing Hydro Air into a larger industrial family.
A spa jet mixes water from the pump with air drawn in through a separate line. The air control is the valve at the top of that line, usually mounted on the spa rim. Open it and more air flows into the jets for a stronger, bubblier massage; close it for a smoother stream of water. Over time sun and chemicals can crack the cap or stiffen the valve, and replacing it is one of the simplest ways to restore a spa's feel.
HVAC365 carries a Hydro Air small air control in tan, a replacement for spas and whirlpool baths that use this style of rim-mounted control. Find it with similar parts in spa air buttons and switches and the broader spa equipment collection.
Hydro Air was sold by ITT Corporation to Balboa Water Group in 2009, and Helios Technologies agreed to acquire Balboa Water Group in 2020.
Hydro Air is known for spa and whirlpool bath components, including jet assemblies, drains, valves, suctions and air controls.
It adjusts how much air is drawn into the jets. Opening it adds bubbles and intensity, and closing it gives a smoother flow of water.
A cracked cap, a knob that will not turn, or jets that no longer respond when you adjust it are common signs that the air control is worn.