Whirlpool Bathtubs

A whirlpool bath is essentially a conventional bathtub with a circulating pump, supply jets and a return intake added.  Whirlpool baths can be very large, and contains a great deal of water when filled.  In some cases, engineering consideration to the floor structure below should be given.  A conventional residential floor system is designed for thirty to forty pounds per square foot of live load.  Typical floor loads imposed by whirlpools range from forty to sixty pounds per square foot.  A visual inspection will not reveal the framing details below a whirlpool in most circumstances. Sometimes, evidence of deflection below the tub can be seen.

GFCI - The electric supply to the whirlpool should be protected by a ground fault circuit interrupter.  This is a special, highly sensitive device which will shut off the electricity in the event of a very small electrical fault. This additional safety is important, of course, wherever water and electricity come together.

Pump and Motor - problems may develop with the electric motor or the pump mechanism.  Leaks or obstructions in the piping lines around the tub can appear, and may be difficult to access and repair.  Connection points of the tub may be potential leakage areas as well.

Controls - The electrical control for the whirlpool should be located at least three feet from the tub.

Many codes also require that the switch be a timer.  There is danger of people staying in the whirlpool for long periods of time.  As a result, the whirlpool should only be able to be turned on for a fixed number of minutes. Some tubs have an air (pneumatic) switch with a timer right on the tub.

Service Access - it is good practice to provide a readily accessible service door to work on the pump and motor.  Where this is not available, repairs will be more expensive.

Larger Water Heater - Larger whirlpool may require larger water heaters to ensure the tub can be filled with hot water.  Some manufacturers recommend water temperatures not exceed 104 F, to avoid discoloration of the acrylic.