How do you drain a hot tub without a hose bib nearby?

Use a submersible utility pump instead of the tub's gravity drain valve. Drop the pump near the lowest point of the tub, run the discharge hose to wherever the water is allowed to go (check local greywater rules first), and it empties a 300-400 gallon tub in roughly 15-20 minutes rather than the hour-plus a gravity valve alone can take.

Can you drain a hot tub into the sewer or storm drain?

Sanitary sewer (a laundry drain, utility sink, or cleanout) is the usual answer once the sanitizer level has dropped, since that water is treated at a plant. Storm drains are a different system in most municipalities — they run straight to local waterways untreated, and draining chlorinated or bromine water into one is a code violation in many areas. Check your city or county's greywater discharge rules before choosing a spot.

Do you have to unplug a hot tub before draining it?

Yes, always. Unplug a 120V plug-and-play or inflatable tub, or shut off the breaker for a 240V hardwired spa, before disconnecting any hose or opening the drain valve. Pumps and heaters are not designed to run dry, and a heater element that fires up with no water around it can crack in seconds.

How long does it take to drain a hot tub?

A gravity drain valve on a 300-400 gallon tub typically takes 45-90 minutes depending on hose diameter and how much downhill slope the water has to work with. A submersible utility pump cuts that to roughly 15-20 minutes for the same volume, which is why most owners upgrade to one after the first all-afternoon gravity drain.

How to Drain a Hot Tub: Step-by-Step (Inflatable & Hard-Shell, 2026)

Quick Answer: Unplug the tub (or shut off its breaker), disconnect the filter, and either open the built-in drain valve and run a garden hose to a sanitary drain, or drop a submersible utility pump into the tub for a much faster empty. A 300-400 gallon inflatable or plug-and-play spa takes 45-90 minutes with the gravity valve alone, or about 15-20 minutes with a pump. Never drain into a storm drain, and never let the heater run dry — both are the two mistakes that turn a routine drain day into a real problem.

Last updated: August 7, 2026.

Every hot tub eventually needs a full drain and refill — our maintenance guide covers when (the gallons-÷-3-÷-bathers formula). This guide covers how: the actual step-by-step process, the tool that turns an hour-long chore into a 20-minute one, and the two mistakes that cause real damage.

Hot tub draining by the numbers

A gravity drain valve alone typically empties a 300-400 gallon residential tub in 45-90 minutes, depending on hose diameter and how much downhill slope is available to help the flow.
A submersible utility pump cuts that same job to roughly 15-20 minutes, according to spa-parts retailers who sell them specifically for this use — the biggest single time-saver in the whole routine.
The Pool & Hot Tub Alliance recommends treating 1,500 ppm above your fill water’s baseline total dissolved solids (TDS) as the trigger to drain, on top of the standard gallons-÷-3-÷-bathers day-count formula covered in our maintenance guide.

Before you start: two safety steps that matter

Cut the power. Unplug a 120V plug-and-play or inflatable tub at the outlet, or switch off the dedicated breaker for a 240V hardwired spa — see our wiring guide if you’re not sure which circuit that is. A heater element that energizes with no water around it can crack within seconds, and it’s the single most expensive mistake on this list.
Pull the filter. Rinse it and set it aside (or replace it if it’s overdue — see our filters guide) so it isn’t sitting in draining water picking up sediment you’ll just rinse off again.

Step-by-step: gravity valve method

Locate the drain valve or spout. Inflatable tubs (Intex, Coleman/SaluSpa) usually have a small barbed drain fitting near the base of the liner. Hard-shell spas (AquaRest, Lifesmart) have a threaded garden-hose drain port on the cabinet, usually low on one side.
Attach a garden hose to the fitting and run the other end downhill to wherever the water is allowed to go — a sanitary cleanout, a lawn area far from garden beds (chlorinated water can stress plants), or a laundry drain. Check your municipality’s greywater rules first; see the FAQ below on storm drains.
Open the valve and let gravity do the work. A garden hose with more downhill slope drains noticeably faster than one running level or slightly uphill.
Once flow slows to a trickle, tip the tub gently (inflatables) or use a wet-vac on the last inch or two (hard-shell) to get the remaining puddle out before it sits and grows anything.

Step-by-step: submersible pump method

Follow the same power-off and filter-pull steps above.
Lower the pump to the deepest point of the tub — most residential spas have a slight low spot near the drain fitting or the equipment bay.
Run the discharge hose to your chosen drain location, same rules as the gravity method.
Power the pump on and let it run until it starts drawing air, then finish the last inch or two by hand the same way as the valve method.

Submersible Utility Pump (Sump/Transfer Style)

Cuts a 45-90 minute gravity drain down to roughly 15-20 minutes

A 1/4 to 1/3 HP submersible transfer pump handles the 300-400 gallon volume of a typical inflatable or plug-and-play spa in one pass.
Pairs with any standard garden hose for the discharge side — no special fittings needed on most models.
Doubles as a sump pump for basement or crawl-space flooding, which is why it's worth owning even if you only drain the tub a few times a year.

Check price on Amazon →

Soak time is story time — start a free Audible trial and get your first audiobook free, so the next drain-and-refill wait (or the next actual soak) has something worth listening to.

While it’s empty: the two-minute jobs worth doing

Wipe down the liner or shell with a soft cloth and diluted spa surface cleaner — see our foam guide if you’ve been fighting bubbles, since an empty tub is the easiest time to break that cycle.
Check the filter housing and jet faces for any mineral scale while there’s no water in the way.
Inspect for leaks around fittings and the pump/heater unions — an empty tub makes a slow leak far easier to spot than a full one; see our leak repair guide if you find one.

Method	Time (300-400 gal)	Tools needed	Best for
Gravity drain valve	45-90 min	Garden hose	Occasional drains, downhill drain spot available
Submersible pump	15-20 min	Utility pump + garden hose	Frequent drains (inflatables), flat yards, no downhill run

The bottom line

Draining a hot tub is a 20-90 minute job depending on whether you’re relying on gravity or a submersible pump, and the process is nearly identical across inflatable and hard-shell spas: cut the power, pull the filter, open the valve or drop the pump, and route the water somewhere your local rules actually allow. The two mistakes that turn this into a real problem — running the heater dry and draining into a storm drain — are both easy to avoid once you know to check for them. For the when half of this routine, see our full maintenance guide, and if the water looks cloudy before you even get to drain day, our cloudy water guide may fix it without a full drain at all. Draining ahead of a relocation rather than routine maintenance? Our how to move a hot tub guide covers the dolly, crew size, and weight math for the actual move once it’s empty.