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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 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.
According to the Power Formula: P (Power) =V x I (electrical power is a function of voltage multiplied by current).
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.
0.8x20A=16A per outlet
16AX110V=1760W or 1.76kW is what is available to power electrical systems from a standard US electrical outlet.
In conclusion from the above example, a standard electrical outlet won’t even be able to handle a single pump and a blower, therefore making any hydromassage system design severely compromised.
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explains why many low-end hydromassage bathtubs are nothing more than noisy and useless water splashing devices with outdated, ugly user interfaces.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.
An indoor spa implies that there is always water inside the tub. In order to contain bacteria growth and keep the water clear, a combination of chemicals, ozonators and filters is used. Just like swimming pools, indoor and outdoor spas are intended for relaxation and not for bathing. It is expected that the users use the indoor spa after taking a shower. Use of soaps, lotions, shampoos, bath salts, oils and other personal hygiene products is not allowed as these will clog the filters and cause the spa system to malfunction.
Water to be removed and tub to be cleaned after each use
Water stays in the tub and is kept clear by filters, ozonators 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
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