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Unlike most markets, in the US and Canada, electrical systems in homes have been standardized at 110V, with the exception of kitchen stoves and washer dryers.
Unfortunately, 110V power has its limits, namely the installation of sophisticated hydromassage systems, as these require a considerable amount of power, which is simply unavailable due to the limited wire size and considerable AMP draw that would be required.
For instance, a typical top of the line Aquatica hydromassage system consists of:
Even with the water heating function which is automatically deactivated when the hydromassage is activated, the above-described hydromassage system would require at least a minimum 3.5kW of constant power.
Now, a standard US 110V electrical outlet is configured to handle a maximum current of 20A, of which, according to the UL safety standards only 80% can be drawn from.
0.8 x 20A = 16A per outlet
16A x 110V = 1760W or 1.76kW is what is available to power electrical systems from a standard US electrical outlet.
This also explains why many low-end hydromassage bathtubs are nothing more than noisy and useless water splashing devices with outdated, ugly user interfaces. There is no therapeutic effect whatsoever.
There are two ways the above problem can be solved:
A hydromassage bathtub is intended to be emptied after every use. The bath electronics are protected by low water level sensors that are programmed to turn off the pumps in the blowers if there is no water. These bathtubs are intended for use with soaps, lotions, shampoos, bath salts, oils, and other personal hygiene products
Water to be removed and tub to be cleaned after each use
Water stays in the tub and is kept clear by filters, Ozonator, and chemicals
Soaps, lotions and hygiene products can be used with this bathtub
Soaps, lotions etc. MUST NOT be used in these spa’s as they WILL clog filters