How to Set Up an Inflatable Hot Tub in Winter (By Model)

By Jake Weber · Published October 26, 2026

Yes, if your pump has Freeze Shield and you follow the winter steps in Bestway’s 2020 SaluSpa AirJet manuals: below 50°F outside, keep the box at least 2 hours in a room above 59°F, inflate it there with its pump, then fill it outside with water above 42.8°F, or E03 appears. Never use it once the air reaches 14°F. The 2017 Coleman 90363 manual shows no Freeze Shield and says not to set it up or leave it out below 40°F.

Check which model you have first. Winter rules change with the pump. I checked four Bestway owner’s manuals: AirJet Plus (2020, pump S100205: Vancouver, Milan), AirJet (2020, pump S100105: Miami, Bahamas, St. Moritz, Helsinki and others), S400 (2023, pumps S400105/S400205) and Coleman 90363 (2017). The model number is on the pump’s label; your own manual is the tiebreaker.

Safety note: check your pump against the 2024 recall. In September 2024 the U.S. Consumer Product Safety Commission announced a recall of about 866,000 Bestway AirJet and HydroJet spa pumps sold with SaluSpa, Coleman and Hydro-Force spas from May 2021 to May 2024, because they can overheat and catch fire (recall 24-359). Before troubleshooting anything below, read the model number on the label on the side or back of your pump. The recalled models are P05332, P05339, P05711, P05807, P07000, P07001, P05511, P07034 and P07572. If yours is one of them, stop using it and follow the CPSC recall notice or Bestway’s recall page for a free replacement or a refund. The SaluSpa pump recall guide walks through the label check and what to do next.

Read that label before step one. The tub’s name on the box doesn’t tell you; only the pump label does. The pump inflates the tub, so check it before you plug it in, even just to inflate. Recalled? Don’t use it, and don’t fill the tub until an unaffected pump arrives: no pump, no heater, no Freeze Shield.

Does your inflatable hot tub have Freeze Shield?

Both 2020 manuals put the FREEZE SHIELD™ badge on their “SET-UP INSTRUCTION IN WINTER” page (AirJet Plus p. 11; AirJet p. 14), and the S400’s winter instructions describe the same system (p. 13).

Although several online guides say Coleman SaluSpas have Freeze Shield, the 2017 Coleman 90363 manual has no Freeze Shield and says not to set it up or leave it out below 40°F (p. 3). The Coleman name doesn’t tell you — check the manual. Search it for “Freeze Shield”; if you can’t confirm it, treat your tub as one without it.

How cold is too cold to set up an inflatable hot tub?

Each manual draws the line in a different place:

The “Using it” figures are cut-offs, not comfortable soaking weather.

Bestway’s web pages vary. Its winter blog (updated February 2025) says that at 14°F “you also don’t want to set up or take down your hot tub.” Its setup blog (August 2026) moves indoors only “below 42.8°F.” The manuals are stricter; follow yours.

How to set up an inflatable hot tub in cold weather, step by step

These steps follow the 2020 Freeze Shield manuals. The S400 repeats them (p. 13) but doesn’t recommend a first setup below 50°F outside at all. No Freeze Shield? Skip ahead. ⚠️ marks a warning to read before its step.

1. Decide if it can stay plugged in all winter. Full and below 42.8°F outside, the heater “must always be on” (AirJet Plus pp. 5, 17). My reading: plan for power cuts, trips away and a bigger bill. Freeze Shield explained covers what it doesn’t protect.
2. Prepare the spot.
   • ⚠️ Surface: “smooth, flat, level and capable of supporting the weight for the entire time,” never carpet (AirJet Plus p. 8). Filled weights: 1,833 lb (Vancouver), 2,103 lb (Milan) (pp. 9–10), which I read as tub and water only. Snow, ice or frozen ground can settle as it thaws (my inference): clear down to a solid base. Doubtful deck? Ask a professional.
   • ⚠️ Power: straight into a grounded outlet; no extension cord or multi-plug adaptor, which “can cause the plug to overheat.” Unsure about the supply? Bestway says consult a qualified electrician (AirJet Plus p. 13). A new outdoor outlet is an electrician’s job too.
   • ⚠️ Clearances: 5 feet from metal surfaces, or 8 AWG bonding (an electrician’s job); no electric appliance within 5 feet, so no space heaters or heat lamps; don’t bury the cord (AirJet Plus p. 4).
3. Warm the box. Below 50°F outside, keep it at least 2 hours in a room above 59°F, so the liner is “more flexible and easier to set up” (AirJet Plus p. 11). Check with a thermometer: an unheated garage may not get there.
4. Inflate it indoors.
   • ⚠️ Test the GFCI before you turn the pump on, even just to inflate: plug in (red light), TEST (off), RESET (red). “Do not use the pump if this test fails” (AirJet Plus p. 13).
   • Measure the doorway: inflated, the Milan is 77 inches across, the Vancouver 61 (pp. 9–10).
   • Inflate with the spa’s pump, per your manual’s drawings (AirJet Plus p. 11). No air compressor, and don’t cover the holes on the inflation hose’s base: that “will over inflate the liner” (p. 13).
   • Go to your model’s pressure: 1.2 PSI on the Milan (p. 10), 7–10 PSI on the Vancouver, with the hand pump and gauge its drawing shows (p. 12).
   • Carry it out with help; don’t drag it (p. 13).
5. Position it outside and connect the pump.
   • ⚠️ Test the GFCI again. The manual asks for it “before turning on the pump each time” (p. 13); repeating it after the move is my rule.
   • Remove the stopper caps before heating (AirJet Plus p. 25).
6. Fill it.
   • ⚠️ Never add water above 104°F (40°C) (AirJet Plus p. 5). Measure it with a thermometer.
   • Fill between MIN and MAX with water above 42.8°F (AirJet Plus pp. 11, 13).
7. Cover on, heat on.
   • ⚠️ Never run the massage with the cover on: “Air can accumulate inside the spa and cause irreparable damage to the cover and bodily harm” (AirJet Plus p. 16).
   • Keep the cover on whenever it heats (AirJet Plus p. 17).
8. Keep an eye on it.
   • ⚠️ Don’t use it in the rain, put the cover back after every use (“Water attracts children”), and mind wet surfaces (AirJet Plus p. 5). In freezing weather, splashes turn to ice.
   • Below 42.8°F outside, check its status: “If the Freeze Shield™ system isn’t working, alarms will pop up on the spa” (AirJet Plus p. 5).
   • Long absence with a risk of dropping below 42.8°F? Bestway “strongly suggest[s] disassembling the spa and storing it” (p. 5); see how to winterize and store it.
   • Once the air reaches 14°F, don’t use it: don’t get in, but don’t switch it off either: never leave it full and unheated when it can freeze. If that’s normal where you live, drain and store it rather than leaving it full. Draining is my call, not a manual line.

What if your hot tub doesn’t have Freeze Shield?

Then the cold is a hard stop. The Coleman 90363 manual gives two separate figures: the spa “should not be setup or left out in temperatures lower than 40°F (4°C)” (p. 3), and “Please do not use the spa when ambient temperature is lower than 39°F (4°C)” (p. 4). Why: “Freezing can severely damage the spa. Improper winterization of your spa can void your warranty” (p. 10).

Bestway’s online FAQ is the most cautious: “For the models without the Freeze Shield system, we don’t recommend using the spa when the outdoor temperature is lower than 10°C/50°F.” And a 43°F restart after an E03 doesn’t make outdoor use at 40°F OK on a Coleman 90363.

My recommendation: set it up once your nightly lows stay above 50°F. Until then, wait for spring, or use an indoor space that stays above those limits and meets the manual’s indoor rules; the winter guide covers that option.

Should you fill it differently when it’s cold?

Common cold-weather tips, checked against the manuals:

How long does it take to heat up after a winter setup?

Bestway’s reference figures assume water and air start at the same temperature, with the cover on:

No row goes below 50°F, and the 2020 manuals say the heater’s rate “may change” below 59°F outside (AirJet Plus p. 16). Bestway’s setup blog says “about 24 hours”; that’s not a promise, and in the cold, plan for more. (The Coleman’s 2–3°F per hour comes from a lab test at “77°F (25°C) and above,” p. 5.) More in how long a SaluSpa takes to heat up.

Why does it show E03 or E02 right after filling?

E03 means the pump reads the water below 40°F (4°C). After a winter setup, the usual suspect is cold fill water (AirJet Plus p. 11).

⚠️ If it’s freezing and you can’t get the water to 43°F, don’t leave it full and unplugged — drain it. That’s my call, not a manual line. And no hair dryer or heater on the pump: nothing electric within 5 feet (AirJet Plus p. 4).

Otherwise, every manual I checked gives the same fix: unplug the pump and restart it only when the water reaches 43°F (AirJet Plus p. 25; AirJet p. 26; Coleman p. 8; S400 p. 17). Details in the SaluSpa E03 guide.

E02 is the no-flow alarm. Bestway’s error-code blog lists “It’s too cold outside to set up your hot tub” as a cause, with the same fix: inflate indoors, fill outside with water “warmer than 42ºF.” The manual’s first E02 cause is simpler: stopper caps left in (AirJet Plus p. 25).

FAQ

Can you set up an inflatable hot tub when it’s below freezing? Not outdoors from start to finish: with Freeze Shield, inflate indoors and fill outside above 42.8°F. A Coleman 90363 stays boxed below 40°F. None of the four manuals allows use at 14°F.

Can I inflate it in the garage and keep it there? Inflating in a garage above 59°F fits the 2020 manuals. Keeping it there is another setup: the indoor rules start with “plenty of ventilation” and a floor that carries the full weight (AirJet Plus p. 8).

Do I really need to warm the box for two hours? Below 50°F outside, yes: the winter steps “prevent damage to the PVC material” (AirJet Plus p. 11). Two hours is the 2020 manuals’ minimum; the S400 gives no time (p. 13).

My pump is on the recall list. Can I still set it up? No. The CPSC says to “immediately stop using the recalled spa pumps,” and setup uses the pump to inflate and heat. Contact Bestway for the replacement or refund; leave the tub boxed until an unaffected pump arrives.

Does the heater have to stay on after setup? On a Freeze Shield pump, yes, while it’s full and below 42.8°F: “do not switch off the spa heater if the temperature is lower than 42.8°F” (AirJet Plus p. 17). A Coleman 90363 has no such mode: below 40°F it shouldn’t be outside (p. 3).

Setting yours up this fall? Tell me which model you have and what your thermometer read. Owner reports are how this page gets better.

Jake Weber — Jake Weber is the pen name of Rookie Spa’s editor. I don’t sell spas or chemicals, and I’m not affiliated with any brand. Every guide here starts from the manufacturer’s manual, is cross-checked against the questions and fixes owners report most often, and is written in plain English for first-time owners — with a clear warning whenever something involves electricity or water safety.