How To Drain A Hot Tub In The Winter – Protect Your Investment
Most hot tub owners love a soak in the snow, but sometimes you need to shut things down for the season. Learning how to drain a hot tub in the winter correctly is the difference between a functional spa in the spring and a series of shattered pipes.
I will walk you through the precise steps to empty your tub and winterize every internal component. You will learn the professional tricks to ensure no moisture remains to cause havoc when the mercury drops.
By following this guide, you can confidently close your spa for a long vacation or a winter hiatus. We will cover everything from the initial power-down to the final protective covering of your outdoor retreat.
Table of Contents
Essential Gear for Winterizing Your Outdoor Spa
Before you start the process, gather the right tools to make the job efficient and safe. You do not want to be running back and forth to the garage when the wind is biting.
A submersible pump is your best friend during a winter drain. While every tub has a built-in drain valve, they are notoriously slow. A pump can empty hundreds of gallons in under thirty minutes.
You also need a high-quality wet/dry vacuum (shop vac). This tool is non-negotiable for removing water from the plumbing lines and jet housings. Leaving even a small amount of water in the pipes can lead to cracks.
Keep several microfiber towels nearby to wipe down the shell once the water is gone. You may also need a screwdriver or wrench to open the equipment panel and access the pump unions.
Finally, consider purchasing non-toxic RV antifreeze. This is specifically for the plumbing and is different from the stuff you put in your car. It provides an extra layer of insurance for your pipes.
Step-by-Step Instructions: how to drain a hot tub in the winter
The first and most important step is to cut the power completely. Locate your circuit breaker or the GFCI disconnect box and flip the switch to the off position.
Never attempt to drain the water while the power is on. The pumps could activate without water flow, leading to catastrophic motor failure or dry-firing the heater element.
If you are wondering about how to drain a hot tub in the winter without a pump, gravity is your only option. Attach a garden hose to the internal drain valve and run it to a lower point on your property.
However, using a submersible pump is much faster and prevents the water from freezing in the hose during the process. Place the pump at the deepest point of the footwell and monitor the discharge.
As the water level drops, use your shop vac to suck out any remaining puddles in the seats and footwell. You want the shell to be as dry as possible before moving to the plumbing.
Clearing the Plumbing Lines
Draining the shell is only half the battle. The real danger lies in the water trapped inside the internal PVC pipes and the heater manifold.
Set your shop vac to the “blow” setting if possible. Place the nozzle against every single jet face and blow air through the lines until no more water mists out.
If your vacuum doesn’t blow, use the suction setting on each jet for at least thirty seconds. This mechanical force pulls water out of the small crevices where it likes to hide.
Don’t forget the air channel if your tub has one. Briefly turn the power back on for 30 seconds to run the air blower, then immediately shut it off again.
Managing the Pump and Heater Unions
Open the side panel of your hot tub to access the equipment compartment. You will see large plastic nuts, known as unions, connecting the pipes to the pump and heater.
Carefully loosen these unions by hand or with a strap wrench. This allows any trapped water to drain out of the equipment and prevents the pump housing from cracking.
Remove the drain plugs from the bottom of the pump housing if they are present. Store these plugs in a safe place, like the filter basket, so you don’t lose them over the winter.
Cleaning and Protecting the Spa Shell After Draining
Once the water is gone, you have a perfect opportunity to clean the acrylic surface. Use a specialized spa cleaner or a mixture of white vinegar and water to wipe away the waterline scale.
Avoid using household soaps or abrasive sponges. These can damage the finish or cause massive foaming issues when you refill the tub in the spring.
Dry the shell completely with your microfiber towels. Any standing water left in the bottom can freeze and cause surface crazing, which looks like tiny spiderweb cracks in the acrylic.
Remove your filter cartridges and take them indoors. Clean them thoroughly and store them in a dry, temperature-controlled environment to prolong their lifespan.
If you choose to use antifreeze, pour a small amount into each jet and the filter canister. This ensures that any residual moisture that settles will not turn into solid ice.
Securing the Cover for the Deep Freeze
Your hot tub cover is the primary line of defense against the elements. Inspect it for any heavy water absorption or structural sagging before locking it down.
If your area receives heavy snowfall, consider placing a plywood board over the cover. This helps distribute the weight of the snow and prevents the foam inserts from snapping.
Use locking straps to secure the cover to the cabinet. High winter winds can easily catch the edge of a cover and flip it off, exposing the dry shell to debris and damage.
A spa cap or a heavy-duty tarp over the entire unit provides an extra layer of waterproofing. This keeps meltwater from seeping into the cabinet or through the cover seams.
Check the tub periodically throughout the winter. Make sure the cover remains secure and that no rodents have tried to make a nest inside the warm equipment bay.
When to Call a Professional for Winter Maintenance
While most DIY enthusiasts can handle a standard drain, some high-end spas have complex plumbing that is difficult to clear. If your tub has multiple pumps or an intricate waterfall system, it might be tricky.
If you feel any resistance when loosening unions or if you cannot find the drain plugs, stop. Forcing a plastic fitting in freezing temperatures often results in it snapping off.
Professional spa technicians have high-powered air compressors designed to “blow out” lines more effectively than a standard shop vac. This is a small investment compared to the cost of pipe repair.
Seek professional help if you notice any existing leaks before draining. These leaks need to be addressed before the tub sits empty, as the seals may dry out and worsen over the winter.
If you are moving into a home with an existing hot tub and are unsure of its history, a professional inspection is a smart move. They can ensure the winterization is done to manufacturer specifications.
Frequently Asked Questions About how to drain a hot tub in the winter
Can I just leave the water in the tub and turn the heater off?
No, this is the most common mistake owners make. Without the heater running and the pumps circulating, the water will freeze, expand, and destroy the plumbing and equipment within days.
How long does it take to winterize a hot tub?
If you have a submersible pump and a shop vac, the entire process takes about two to three hours. Taking your time ensures you don’t miss any critical steps in the plumbing.
Is it better to keep the hot tub running all winter?
From a mechanical standpoint, it is better for the seals to keep the tub running. However, if you are concerned about energy costs or will be away for months, a proper drain is the safer financial choice.
What happens if I don’t get all the water out of the lines?
Water expands by about 9% when it freezes. This expansion creates enough pressure to burst PVC pipes and crack the plastic manifolds inside your heater and pumps.
Should I put a heater inside the equipment cabinet?
This is generally not recommended as it poses a fire risk. It is much safer to properly drain the lines and use non-toxic antifreeze than to rely on a small space heater.
Closing Your Spa with Confidence
Taking the time to learn how to drain a hot tub in the winter is an essential skill for any self-sufficient homeowner. It protects your investment and ensures that your first soak in the spring is stress-free.
Remember that the key is in the details. Draining the water is the easy part; removing the moisture from the hidden lines is what truly saves your spa from the ice.
Follow these steps closely, stay dry while you work, and keep your tools organized. Once the cover is locked and the tarp is tied down, you can head inside and enjoy the winter from the warmth of your home.
Stay prepared, stay proactive, and keep your gear in top shape for the next season of adventure!
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