How to Drain a Hot Tub
A hot tub should be drained every 2-4 months, depending on how much use it gets. But if you’ve had a weekend hot tub party or if there is a chemical imbalance in your hot tub, you should drain it and fill it up with fresh water.
To make full use of your hot tub, you also need to maintain it, and you will need to drain the hot tub from time to time. There are many ways of draining the hot tub, and in this article, we are going to take a look at some of these methods and discuss how to drain a hot tub effectively.
Methods for Draining a Hot Tub
1. Using a Submersible Pump
This is the fastest way to drain a hot tub. You can place the pump in the tub, connect the hose to it, and let it pump out all the water. Make sure to direct the hose to an appropriate drainage location.
2. Using the Drain Valve
Most hot tubs come with a drain spigot or valve at the base. Attach a garden hose to the spigot and direct it to a suitable drainage location. Open the valve and let gravity do the rest.
3. Siphoning with a Hose
If there’s no drain spigot or you don’t want to use a pump, you can use a garden hose for siphoning. Fill the hose with water, submerge one end in the tub, and place the other end at a lower level. Gravity will pull the water out of the tub.
4. Vacuuming the Water Out
Use a wet/dry vacuum to remove leftover water. This method is ideal for clearing the last bits of water from hard-to-reach areas like pipes or seats.
Tips to Consider When Draining Your Hot Tub
- Shut Off the Power: Always turn off the power supply to the hot tub before draining to prevent any electrical issues.
- Clean the Tub: Once drained, take this opportunity to clean the tub thoroughly using mild soap and warm water.
- Dispose of Water Properly: Ensure you comply with local regulations regarding water disposal, especially if your tub uses chemicals.
- Refill the Tub Promptly: For wooden hot tubs, avoid leaving them empty for long periods to prevent damage.
FAQs
How often should I drain my hot tub?
Most residential spas need fresh water every 3–4 months (or sooner after heavy bather load). Use our when to drain hot tub water schedule and drain interval formula to pinpoint your exact timing.
Can I drain my hot tub into the yard?
Check local regulations before draining the water into your yard. Ensure the water is free of chemicals if you plan to do so.
How long does it take to drain a hot tub?
Using a submersible pump, it takes about 10-20 minutes. Gravity-based methods can take longer.
Drain Method Speed & Gear Comparison
| Method | Time for 350-Gallon Tub | Remaining Bottom Water | Best For |
|---|---|---|---|
| Electric Submersible Pump | 10 – 20 minutes | ~0.5 inch (wipe/vac remainder) | Fastest deep cleans and routine 3–4 month changes |
| Built-In Gravity Drain Valve | 60 – 120 minutes | 1 – 2 inches depending on spigot height | Zero extra hardware when a sloped drain route is nearby |
| Garden Hose Siphon | 45 – 90 minutes | ~1 inch | Patios located higher than your yard lawn or drain slope |
| Wet/Dry Shop Vacuum | Final 5 – 10 minutes | Zero (bone dry lines/wells) | Clearing residual dirty water out of footwells and jet seats |
Once dry, follow our how to clean a hot tub shell and filter guide before refilling and resetting startup chemistry.
Conclusion
Draining your hot tub is an essential part of maintenance to ensure the water stays clean and safe for use. By using the methods above and following safety tips, you can make the process efficient and straightforward.