Q: I live in a house that is 100% solar-powered, and I am looking to buy a hot tub. They all say "15 amp." Does this mean they use 15 amps all the time or that they use a 15 amp circuit? If it is all the time that would be roughly 1650-1800 watts. Or is it less because it hooks up to a 15-amp breaker? I am trying to figure out how that relates to how many watts my system puts out.
A: A small 120v hot tub that is rated at 15 amp will only draw 15 amps during its heating cycle. It will draw about 8 amps during jet action and very little power while at rest.
Of course, it all depends on your use habits. Using the tub often, like 2 to 3 times per week, it would be best to leave hot. Once every two weeks of use, it would make sense to turn it down or off between uses. Just keep in mind that with a low amperage heater it will take a while to heat it between uses. You should see 2 or 3 degrees per hour.
-- Answer from Jerry P. , plumber and former pool store owner on JustAnswer.
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