Hot Tub Thermometers: Which Model Is the Best Choice for Your Outdoor Hot Tub?
A relaxing evening in the hot tub can quickly turn into a disappointment if the water is too cold or uncomfortably hot. That’s exactly why a reliable hot tub thermometer is one of the most important accessories for your hot tub.
Although many outdoor hot tubs have a built-in temperature display, it’s still a good idea to have an additional thermometer. It helps you monitor the actual water temperature at all times and detect any potential deviations early on.
But which hot tub thermometer is the best choice? Floating models, digital thermometers, or smart versions with an app—there’s a wide variety to choose from.
Why a Hot Tub Thermometer Is Useful
The right water temperature not only ensures greater comfort but also contributes to a safe bathing experience.
Many hot tub owners rely solely on their hot tub's built-in temperature display. While this display is usually reliable, it may show slight variations depending on the model.
An additional hot tub thermometer lets you monitor the temperature independently. This can be especially helpful after a water change, while the water is heating up, or during maintenance.
It also helps you see more quickly whether your hot tub is actually reaching the desired temperature or if there might be a problem with the heater.
What is the ideal temperature?
The ideal hot tub temperature depends on your personal preferences and the time of year.
The following values serve as a guide:
| Usage | Recommended Temperature |
|---|---|
| Summer | 34 to 36 °C |
| Year-round use | 36 to 38 °C |
| Wellness and Relaxation | 37 to 39 °C |
| Maximum Recommended Temperature | 40 °C |
You should avoid temperatures above 40 °C for extended periods, as they can put a greater strain on your circulatory system.
A Comparison of Different Hot Tub Thermometers
Want to see the differences at a glance? The following table will help you make your choice.
| Thermometer | Advantages | Disadvantages | Recommendation |
|---|---|---|---|
| Floating Thermometer | Simple, affordable, reliable | Must be read directly at the hot tub | ⭐⭐⭐⭐⭐ |
| Digital Thermometer | Highly accurate measurement, easy to read | Requires batteries | ⭐⭐⭐⭐ |
| Smart Thermometer | Monitor Temperature via Smartphone | Higher price | ⭐⭐⭐⭐ |
Our recommendation: For most hot tub owners, a high-quality floating thermometer is more than enough. It’s reliable, durable, and easy to use.
Floating Hot Tub Thermometers
Floating thermometers are among the most popular types.
They float on the water's surface at all times, allowing you to quickly check the water temperature whenever you want.
Advantages:
- inexpensive
- Ready to use right away
- No batteries required
- easy operation
- Suitable for almost any hot tub
Disadvantages:
- The temperature must be read directly from the thermometer
- may occasionally get in the way while bathing
For most outdoor hot tubs, this option is perfectly adequate.
Digital Hot Tub Thermometers
Digital thermometers provide particularly accurate temperature readings.
The readings are shown on an easy-to-read display. Many models also store the highest and lowest temperatures measured.
Advantages:
- high measurement accuracy
- easy-to-read display
- Additional measurement functions
Disadvantages:
- Battery replacement required
- a slightly higher purchase price
If you place a high value on precision, a digital thermometer is a good choice.
Smart Hot Tub Thermometers
Smart thermometers offer the greatest convenience.
They transmit the temperature directly to your smartphone via Bluetooth or Wi-Fi. Some models even automatically notify you when the water temperature changes.
This model is particularly well-suited for tech enthusiasts or owners of high-end outdoor hot tubs.
How to Measure Water Temperature Correctly
To ensure that your hot tub thermometer provides the most accurate readings possible, there are a few things you should keep in mind.
Let the thermometer float freely on the water's surface, and do not place it directly next to a nozzle or the heating element.
After turning on the massage function, you should wait a few minutes before checking the temperature. The reading may fluctuate slightly while the water is moving.
Also, try to always check the temperature at the same spot. That way, you'll get comparable readings.
What should you look for when buying?
Not all hot tub thermometers are equally good.
When making a purchase, pay special attention to the following features.
Easy-to-read display
The temperature should be easily visible both during the day and in the evening.
High measurement accuracy
A good thermometer measures the water temperature as accurately as possible. High-quality models usually deviate from the actual temperature by only about 0.5 °C.
Weather resistance
Since outdoor hot tubs are kept outside year-round, your thermometer should be UV-resistant and waterproof.
Swimming ability
A floating thermometer should rest steadily on the water's surface and not spin around constantly.
Durable Materials
High-quality plastics ensure that your thermometer will work reliably for many years.
Why the temperature should be checked regularly
Water temperature affects more than just your well-being.
If the water is too cold, it detracts from the spa experience.
If the temperature remains too high for an extended period, energy consumption and heating costs will rise. At the same time, water quality can deteriorate more quickly, as microorganisms multiply more easily at higher temperatures.
With a hot tub thermometer, you can detect temperature fluctuations early on and take action in a timely manner.
How to Keep Your Hot Tub Warm Longer
A good thermometer will help you monitor the temperature. However, it’s even more important to keep the heat in the hot tub for as long as possible.
The following will help you:
- a high-quality hot tub cover
- a custom-fit thermal cover
- Regular monitoring of the water temperature
- sufficiently long filter service life
- good thermal insulation
Above all, a high-quality hot tub cover significantly reduces heat loss and helps you save on energy costs.
Frequently Asked Questions
How accurate are hot tub thermometers?
High-quality models typically measure temperature with an accuracy of about ±0.5 °C.
What should the temperature be in the hot tub?
It works best when it floats freely on the water's surface and is not located directly next to the nozzles or the heating element.
Do you need an additional thermometer if your hot tub already has a temperature display?
Not necessarily. However, a separate thermometer is ideal for monitoring and will quickly alert you to any measurement discrepancies.
How long does a hot tub thermometer last?
High-quality mechanical thermometers often last for many years. Digital models are also durable, but they occasionally require new batteries.
Which hot tub thermometer is the best choice?
For most owners of an outdoor hot tub, a high-quality floating hot tub thermometer is the best solution. It is reliable, durable, affordable, and ready to use at any time.
Digital thermometers offer even greater measurement accuracy and additional features. Smart models are particularly well-suited for anyone who wants to conveniently monitor their hot tub via smartphone.
Ultimately, it comes down to which features are important to you. No matter which model you choose, a good hot tub thermometer ensures that you can keep an eye on your water temperature at all times and enjoy your hot tub even more.
Tip from Cover König: To help your hot tub maintain the desired temperature for as long as possible, you should use the thermometer in combination with a high-quality, custom-fit hot tub cover. A well-insulated thermal cover reduces heat loss, saves on energy costs, and ensures that your hot tub stays comfortably warm at all times.
