Inflatable hot tub guide
Inflatable tubs are the easy way in: cheaper, no install, set up in an afternoon. They ask a bit more of you on heating and water care, though, so here is the honest picture, plus the basics that keep one clean.
Inflatable vs hard-side, honestly
An inflatable (Intex, Coleman SaluSpa, Lay-Z-Spa and similar) costs a fraction of a hard tub, needs no electrician, and packs away. The tradeoffs are real: a small plug-in heater warms slowly and struggles to hold temperature in cold weather, the thinner walls lose more heat, and the seats and jets are basic. A hard-side tub costs much more and needs a pad and often wiring, but heats faster, holds heat far better, and lasts longer. If you want a low-commitment soak or a first tub, inflatable makes sense; if you will use it year-round in a cold climate, a hard tub earns its keep.
What it costs to run
Running cost is mostly heat loss, and an inflatable loses more through its walls and lighter cover, so it costs more per month than a well-insulated hard tub of the same size, especially in winter when a 1 to 1.5 kW heater can barely keep up. Put real numbers on it with the running cost calculator, and check the heat-up time before you plan a soak: from cold, an inflatable can take most of a day to reach temperature. A snug, dry cover and an insulating ground mat under it make a bigger difference here than on any hard tub.
How many people does one really fit?
Treat the marketing capacity as optimistic. A "4 person" inflatable seats four shoulder to shoulder with knees together; for room to relax, subtract one. Capacity also sets your water volume, which drives every chemical dose, so confirm your gallons with the volume calculator rather than trusting the box.
| Marketed size | Comfortable for | Typical gallons |
|---|---|---|
| 2 to 4 person | 2 to 3 | 200 to 250 |
| 4 to 6 person | 3 to 4 | 250 to 290 |
Keeping an inflatable clean
The water care is the same chemistry as any tub, just in less water, so doses are small and balance tips quickly. Test often, balance alkalinity then pH then sanitizer, and keep the little filter cartridge clean, since the small filters clog fast. The dosing calculator sizes everything for your gallons, and these guides cover the rest:
- Cloudy water and foam, both common in small tubs.
- Cleaning the filter, which matters more when it is tiny.
- When to change the water, sooner in a small tub with a few bathers.
The starter kit
You need a sanitizer, pH and alkalinity adjusters, shock, and test strips to start. A starter kit bundles them; add a spare filter cartridge because inflatable filters are small and clog quickly.
Get spa chemical starter kit Get hot tub test strips Get replacement spa filter cartridge
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Common questions
Can you use an inflatable hot tub in winter?
In mild winters, yes, but a 1 to 1.5 kW heater struggles to hold temperature in hard freezes and can run almost constantly. An insulating mat underneath, a snug cover, and a sheltered spot all help. In a severe climate, an inflatable is better treated as a three-season tub.
Are inflatable hot tubs expensive to run?
Per month they tend to cost more than a well-insulated hard tub of similar size, because they lose more heat. The gap is widest in winter. The running cost calculator gives you a number for your tub and climate.
How often do I change the water in an inflatable?
Often sooner than a hard tub, because there is less water to dilute the bather load. Use the bather rule on the water change schedule page; small tubs with regular use can need a change every few weeks.