How Much Does Hot Tub Water Evaporate?


Water vapor that evaporates at a rate of approximately 1 gallon per hour from a standard hot tub.

This means that if your hot tub holds 500 gallons of water, it will lose water approximately 500 gallons per day to evaporation.

Keep in mind that this figure assumes optimal conditions and does not take into account wind or other factors that may affect the water evaporation rate.

How Often Do I Need To Add Water To The Hot Tub?

Answer: It depends on your tub’s make and model, but generally speaking you should add water to a hot tubs top at least every other day.

You can also test the water’s pH level and chlorine levels to make sure they’re in the safe range, and add more chemicals as necessary.

Why Does My Hot Tub Keep Losing Water?

There could be a few reasons why your hot tub’s water well is losing water.

One possibility is that there’s a leak in the tub cover itself, which can cause water to seep out slowly over time.

Another possibility is that your plumbing may not be fully tightened, which can also cause leaks.

Additionally, if you have an automatic fill hose connected to your hot tub, the float switch may not be working properly, causing water to continuously run into the hot tub pump, and causing it to overflow.

Whatever the reason may be, it’s important to identify and fix the problem as soon as possible to avoid expensive damage or repairs down the line.

How Long Does Water Last In A Hot Tub?

Answer: It can last anywhere from a few days to a week, depending on hot tub’s temperature, the water temperature and how often the hot tub is used.

If the water temperature is over 104 degrees Fahrenheit, then it’s not safe for human contact after about 48 hours.

If the water temperature is below 104 degrees Fahrenheit, then it’s not hot water and not safe for human contact after about a week.

However, if the hot tub isn’t being used frequently, then it will last longer than most hot tubs do if it’s being used every day.

Does Hot Tub Water Evaporate In Summer?

Yes, the same amount of water will evaporate from a front heater or hot tub in summer as it does in winter.

The amount of water that evaporates from a still pool or hot tub is based on the ambient temperature and humidity.

In winter, when the air is colder and drier, more water will evaporate from a hot tub’s bottom than in summer, when the air is warmer and more humid.


  • Jason

    Jason is an experienced writer, having contributed to many popular websites over the years. He currently writes for Big Hot Tub, a blog about everything hot tubs. When he's not writing or working on his blog, Jason enjoys spending time with his wife and two young children.