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# Best Hot Tub for Greenhouses When Floor Space Is Tight
- URL: https://udiwg.org/best-hot-tub-greenhouses/
- Published: 2026-09-07T07:32:29.000Z
- Updated: 2026-09-07T09:49:27.000Z
- Description: Six inflatable spas compared on footprint, wall height and jet count, plus what a glass structure changes about heat, humidity and drainage before you buy.
- Author: Dane Jones
- Tags: Pools, Hot Tubs & Supplies, Outdoor Living, Hot Tubs

The best hot tub for greenhouses is the CO-Z 6ft Inflatable Hot Tub, because its 70.9 x 70.9 in footprint and 25.6 in wall height fit inside a modest clear span without crowding the door. The INTEX PureSpa 6 Person is the runner-up, and it wins the moment your structure gives you a full 94 x 94 in of clear floor.

What splits this field is not jet count. It's the pair of numbers that decide whether the thing physically fits: outside footprint and wall height. Four of these six listings publish a usable size, and two do not. That gap is the whole story.

In this guide
1. [Best hot tub for greenhouses at a glance](#best-hot-tub-for-greenhouses-at-a-glance)
2. [How I narrowed six listings down to a ranking](#how-i-narrowed-six-listings-down-to-a-ranking)
3. [Why footprint decides the best hot tub for greenhouses](#why-footprint-decides-the-best-hot-tub-for-greenhouses)
4. [1\. CO-Z 6ft Inflatable Hot Tub — Best overall](#1-co-z-6ft-inflatable-hot-tub-%E2%80%94-best-overall)
5. [2\. INTEX PureSpa 6 Person Inflatable Hot Tub — Runner-up](#2-intex-purespa-6-person-inflatable-hot-tub-%E2%80%94-runner-up)
6. [3\. UHOMEPRO Inflatable Hot Tub Spa Set — Best minimal setup](#3-uhomepro-inflatable-hot-tub-spa-set-%E2%80%94-best-minimal-setup)
7. [4\. Bestway SaluSpa Hawaii 4 to 6 Person — Best for pros](#4-bestway-saluspa-hawaii-4-to-6-person-%E2%80%94-best-for-pros)
8. [5\. Bestway SaluSpa Cancun Energy-Efficient 2-4 Person — Best budget pick](#5-bestway-saluspa-cancun-energy-efficient-2-4-person-%E2%80%94-best-budget-pick)
9. [6\. Inflatable Hot Tub Swimming Pool Enclosure Solar Dome — Best premium](#6-inflatable-hot-tub-swimming-pool-enclosure-solar-dome-%E2%80%94-best-premium)
10. [What does a glass structure change about a spa?](#what-does-a-glass-structure-change-about-a-spa)
11. [CO-Z vs Intex: which square footprint wins?](#co-z-vs-intex-which-square-footprint-wins)
12. [What the listings do not tell you](#what-the-listings-do-not-tell-you)
13. [The verdict](#the-verdict)
14. [FAQ](#faq)

## Best hot tub for greenhouses at a glance

| Pick                                                                                                           | Footprint                | Jets                       | Price                                                            |
| -------------------------------------------------------------------------------------------------------------- | ------------------------ | -------------------------- | ---------------------------------------------------------------- |
| **Best overall**[CO-Z 6ft Inflatable Hot Tub](https://www.amazon.com/dp/B0HB4YLJBZ?tag=udiwg-20)               | 70.9 x 70.9 x 25.6 in    | 94 air jets (claim)        | [Check Price](https://www.amazon.com/dp/B0HB4YLJBZ?tag=udiwg-20) |
| **Runner-up**[INTEX PureSpa 6 Person](https://www.amazon.com/dp/B09J99GXYM?tag=udiwg-20)                       | 94 x 94 x 28 in          | Heated air bubbles (claim) | [Check Price](https://www.amazon.com/dp/B09J99GXYM?tag=udiwg-20) |
| **Best minimal setup**[UHOMEPRO Inflatable Hot Tub Spa Set](https://www.amazon.com/dp/B0GZ452QTP?tag=udiwg-20) | 72.8 x 72.8 x 25.6 in    | 130 air jets (claim)       | [Check Price](https://www.amazon.com/dp/B0GZ452QTP?tag=udiwg-20) |
| **Best for pros**[Bestway SaluSpa Hawaii 4 to 6 Person](https://www.amazon.com/dp/B0FTBVGNJQ?tag=udiwg-20)     | 71 x 28 in in title only | 140 AirJets (claim)        | [Check Price](https://www.amazon.com/dp/B0FTBVGNJQ?tag=udiwg-20) |
| **Best budget pick**[Bestway SaluSpa Cancun](https://www.amazon.com/dp/B0FTB5SMB9?tag=udiwg-20)                | Not published            | 120 bubble jets (claim)    | [Check Price](https://www.amazon.com/dp/B0FTB5SMB9?tag=udiwg-20) |
| **Best premium**[Inflatable Solar Dome Cover Tent](https://www.amazon.com/dp/B0H4WBPT7M?tag=udiwg-20)          | 12 x 5 x 3 m dome        | Enclosure, not a spa       | [Check Price](https://www.amazon.com/dp/B0H4WBPT7M?tag=udiwg-20) |

## How I narrowed six listings down to a ranking

I weighted four criteria, in this order, and then checked which listings could actually satisfy them.

1. **Published outside footprint.** A spa that doesn't fit is not a candidate. This carried the most weight because it's the only criterion a reader cannot fix after delivery.
2. **Wall height.** Under a low eaves line or a sloping roof, 25.6 in and 28 in are different decisions.
3. **Published weight.** Filled water weight dwarfs shipping weight, but a stated dry weight still tells you whether one person can carry the box in through a narrow door.
4. **Jet count and control.** Real differences, but they come last, because every listing here claims a heated bubble system.

Why that order? Because a glass or polycarbonate structure is a fixed box. You can add a stronger floor, you can vent it, you can run a longer cable. You cannot widen it. So the specification that survives every other change goes first.

Applying it dropped the SaluSpa Cancun to fifth despite it being the cheapest of the six: its listing publishes a size value of "Energy Efficient 2.0" and dimensions of 0 x 0 x 0 in, which tells a shopper nothing about fit. The solar dome tent went last on a different basis. It's a 12 x 5 x 3 m cover in the hot tub accessories category, not a spa.

## Why footprint decides the best hot tub for greenhouses

Most guides to the best hot tub for greenhouses lead with jet count. Here that number ranges from 94 to 140 across the four listings that state one, and every one of those figures is the manufacturer's claim rather than a standardised measurement. You cannot compare 94 air jets on one brand's pump against 140 on another's with any confidence.

Footprint you can compare, because it's a physical measurement in inches.

Line up the three listings with full dimensions and the spread is stark:

- CO-Z: **70.9 x 70.9 in**, 25.6 in tall
- UHOMEPRO: **72.8 x 72.8 in**, 25.6 in tall
- INTEX PureSpa: **94 x 94 in**, 28 in tall

That's a difference of just under 2 ft per side between the smallest and largest. In a backyard, nobody notices. Inside a structure with a fixed frame and a door on one gable, 2 ft is the difference between walking around the tub and squeezing past it.

Here's the trick with clear span. Measure at bench height, not at floor level, because most glasshouse frames taper. Then subtract at least 18 in on one side for the pump unit and access. The CO-Z at 70.9 in square leaves usable room in an 8 ft wide structure. The PureSpa at 94 in square does not.

## 1\. CO-Z 6ft Inflatable Hot Tub — Best overall

**The only pick here that pairs a published 70.9 in square footprint with a 25.6 in wall and a stated 54 lb dry weight, which is the combination a tight indoor span actually needs.**

[![CO-Z four-person blue inflatable spa with control unit — its 70.9 in square footprint is the smallest fully published size in this set](https://m.media-amazon.com/images/I/41j2FtJfS1L._SL500_.jpg)](https://www.amazon.com/dp/B0HB4YLJBZ?tag=udiwg-20)

**Best for:** a compact glass or polycarbonate structure with a 6 ft clear span **Skip it if:** you need seating for five or six

Three numbers make the case. The footprint is 70.9 x 70.9 in, the smallest fully documented size in this comparison. The wall is 25.6 in, tied with the UHOMEPRO for the lowest here, which matters under a sloping roof or a low eaves line. And the shipping weight is 54 lb, the lightest published figure of the six, so getting the box through a standard door and around a potting bench is a one-person job.

CO-Z describes a 5 ft 11 in wide interior with a 228-gallon capacity for up to four adults, and lists 94 air jets. Treat the jet figure as a claim. The capacity figure is worth more attention than the jets, because 228 gallons of water is roughly 1,900 lb sitting on your floor once filled. Plan the base for that.

The listing also states reinforced puncture-resistant PVC, filter cartridges and a built-in drain. The drain matters more indoors than out, since you want water leaving on your terms rather than across a gravel floor.

The trade-off against the PureSpa is straightforward. You give up two seats and 28 in of wall depth, and you get a spa that fits where the bigger one won't. It's also the second-cheapest of the six, which is unusual for a pick that leads on documented specifications.

**Pros:**

- Smallest fully published footprint at 70.9 x 70.9 in
- Lowest wall height here, 25.6 in
- Lightest stated dry weight of the set, 54 lb
- 228-gallon capacity claim for four adults
- Second-cheapest pick in this comparison

**Cons:**

- No published warranty, unlike the INTEX PureSpa
- Lowest jet claim of the four listings that state one
- Only one seller lists it
- Four-person capacity caps group soaks

[Check Price on Amazon](https://www.amazon.com/dp/B0HB4YLJBZ?tag=udiwg-20)

## 2\. INTEX PureSpa 6 Person Inflatable Hot Tub — Runner-up

**The only pick in this set with a published warranty, and the one buyers choose most often here, but its 94 x 94 in footprint demands a genuinely wide structure.**

[![Intex PureSpa gray six-person round spa with insulated cover — the 94 x 94 in footprint is the largest documented size in this set](https://m.media-amazon.com/images/I/41bVT1xIoML._SL500_.jpg)](https://www.amazon.com/dp/B09J99GXYM?tag=udiwg-20)

**Best for:** a large structure with 8 ft of clear floor and a solid slab **Skip it if:** your clear span is under 8 ft

This is the most documented listing of the six. Dimensions of 94 x 94 x 28 in, a 130.5 lb weight, a gray finish, model 28451EP and a 1 Year Limited Warranty. No other pick here publishes warranty terms at all, and that single field is a real differentiator when everything else in the category ships with silence on the subject.

It also sells faster than the rest of this set, and two sellers list it rather than one.

The size is the catch. At 94 in square it needs almost 8 ft of clear floor before you add pump access, so it belongs in a wide walk-in structure rather than a hobby frame. The 28 in wall is the tallest here, which is more comfortable to sit in and more awkward to squeeze past.

Intex lists heated air bubble technology, a thermal-resistant foam cover, Fiber-Tech beam construction and a built-in hard water treatment system. That last one is worth noting if you fill from a rainwater butt or a hard mains supply, though it's a manufacturer claim rather than a verified performance figure.

The trade-off against the CO-Z is space for reassurance. You're paying a premium position in this set and surrendering roughly 2 ft per side to gain two seats, a deeper wall and stated warranty cover.

**Pros:**

- Only pick here with a published warranty, 1 Year Limited
- Tallest wall in the set at 28 in
- Most complete specification list of the six
- Sells faster than the rest of this set
- Two sellers stock it, more than any other pick

**Cons:**

- Largest footprint here at 94 x 94 in
- Heaviest spa in the comparison at 130.5 lb
- Premium price position among these six
- No stated jet count to compare against rivals

[Check Price on Amazon](https://www.amazon.com/dp/B09J99GXYM?tag=udiwg-20)

## 3\. UHOMEPRO Inflatable Hot Tub Spa Set — Best minimal setup

**Ships as a set with two covers and a tool kit, so the first fill needs nothing you don't already have in the box.**

[![UHOMEPRO natural-finish square inflatable spa with external heater pump — 72.8 in square and 25.6 in tall, close to the smallest footprint here](https://m.media-amazon.com/images/I/51UmvMUMvUL._SL500_.jpg)](https://www.amazon.com/dp/B0GZ452QTP?tag=udiwg-20)

**Best for:** someone who wants the accessory kit and covers in one box **Skip it if:** you need a published weight before you commit

The measured case is close to the CO-Z: 72.8 x 72.8 x 25.6 in, so under 2 in wider per side and identical in height. If your clear span accommodates one, it very likely accommodates the other. It's a square 73 in shell in a natural finish, model OHT003, and it sits at the middle of the price range here.

What separates it is what UHOMEPRO says comes with it. The listing describes an inflatable cover for faster heating plus a separate thermal cover with a child safety lock, a high-quality filter, an inflation hose, a repair sheet, a small wrench and four filter elements. Two covers is unusual. Under glass, a thermal cover earns its keep during the hours nobody's soaking, when a lidless tub is dumping heat and moisture into the structure.

The jet claim is 130 air jets from a 600W bubble system, and the heater is external with a claimed 104°F ceiling.

The gap is weight. The listing publishes no figure, so you can't plan the carry or the floor loading from the page alone. Against the CO-Z you trade a documented 54 lb dry weight and a slightly tighter footprint for a richer accessory bundle. It also has the highest position in this set on how quickly it moves, meaning it's the slowest seller of the six.

**Pros:**

- Two covers claimed, including a thermal cover with child lock
- 72.8 in square footprint, second-smallest documented here
- 25.6 in wall matches the lowest in the set
- Accessory kit claim includes hose, wrench and four filter elements

**Cons:**

- No published weight for planning floor load or carry
- Slowest seller of the six
- No stated warranty
- Only one seller lists it

[Check Price on Amazon](https://www.amazon.com/dp/B0GZ452QTP?tag=udiwg-20)

## 4\. Bestway SaluSpa Hawaii 4 to 6 Person — Best for pros

**App control from indoors is the one genuinely different capability in this set, though the listing's own specification fields are close to empty.**

[![Bestway SaluSpa Hawaii blue square spa with digital control panel — the 140 AirJet claim is the highest jet figure in this comparison](https://m.media-amazon.com/images/I/41UwSChD0JL._SL500_.jpg)](https://www.amazon.com/dp/B0FTBVGNJQ?tag=udiwg-20)

**Best for:** app-based temperature and filter scheduling from indoors **Skip it if:** you need published dimensions to plan a tight layout

Bestway says this one works with the Bestway Connect app, so you can set temperature, timer, filter cycles and the massage system from a phone. That's the standout here. If your structure sits at the end of the garden, being able to bring the water up to temperature before you walk out in a dressing gown is a practical win rather than a gimmick.

The claimed jet count is 140 AirJets for up to six people, the highest figure among these six. Bestway also claims insulated walls and cover up to 40% more energy-efficient than similar hot tubs, and states APSP-14 and Title 20 compliance. MaxHold fabric internal beams handle pressure retention. Digital panel, 104°F ceiling.

Now the problem. The product title carries 71" x 28", but the specification fields publish a colour of Blue, a count of 1, a weight of 0 g and dimensions of 0 x 0 x 0 in. I'd treat the title figure as indicative and measure your span with a generous margin before ordering, because there's nothing in the specifications to confirm it.

Against the CO-Z, you gain app scheduling and a higher jet claim, and you give up the documented footprint and weight that make a tight indoor fit predictable. Mid-range on price in this set.

**Pros:**

- Highest jet claim here, 140 AirJets
- App control for temperature, timer and filter
- Insulation claim of up to 40% better heat retention
- Stated APSP-14 and Title 20 compliance

**Cons:**

- Specification fields publish 0 x 0 x 0 in dimensions
- Weight listed as 0 g, so no carry or load planning
- No stated warranty
- Only one seller lists it

[Check Price on Amazon](https://www.amazon.com/dp/B0FTBVGNJQ?tag=udiwg-20)

## 5\. Bestway SaluSpa Cancun Energy-Efficient 2-4 Person — Best budget pick

**The cheapest of the six and the smallest stated capacity, which is exactly the pairing a two-person soak under glass often wants.**

[![Bestway SaluSpa Cancun round inflatable spa in Cancun colourway — a 2 to 4 person size and the cheapest pick in this set](https://m.media-amazon.com/images/I/41c7y9C7DXL._SL500_.jpg)](https://www.amazon.com/dp/B0FTB5SMB9?tag=udiwg-20)

**Best for:** the cheapest way into a 2-4 person soak **Skip it if:** you want the biggest jet count here

Sized for 2 to 4 people, this is the entry point of the group on price. Bestway claims 120 bubble jets, insulated walls and a cover up to 40% more efficient than similar tubs, APSP-14 and Title 20 compliance, and MaxHold fabric internal beams for pressure retention and portability. Model 6003YE, in the Cancun colourway, with a digital panel reaching 104°F.

One claim stands out for anyone soaking through winter. Bestway describes Freeze Shield protecting the pump and liner from cold-weather damage, and says the tub stays up all year. An unheated glasshouse can drop below freezing on a clear night even when the day was mild, so a stated freeze protection feature is more relevant here than it would be for a summer-only backyard spa.

The listing's weakness is the same one that pushed it down my ranking. The size field reads "Energy Efficient 2.0" and the dimensions read 0 x 0 x 0 in. There is no published footprint, no wall height and no weight, so you cannot plan a tight layout from the page. For a 2-4 person round tub you should expect something smaller than the CO-Z, but expecting is not measuring.

Against the CO-Z you save money and lose every dimension you'd want to check first.

**Pros:**

- Cheapest pick in this comparison
- Freeze Shield claim for pump and liner in cold weather
- 120 bubble jet claim for a 2-4 person size
- Insulation claim of up to 40% better heat retention

**Cons:**

- No published footprint, height or weight
- Smallest stated capacity of the spas here
- No stated warranty
- Only one seller lists it

[Check Price on Amazon](https://www.amazon.com/dp/B0FTB5SMB9?tag=udiwg-20)

## 6\. Inflatable Hot Tub Swimming Pool Enclosure Solar Dome — Best premium

**This is a 12 x 5 x 3 m inflatable cover, not a spa, so it only makes sense if you already own the tub.**

[![Inflatable white solar dome cover tent for pools and spas — a 12 x 5 x 3 m enclosure in 0.6 mm PVC, sold as an accessory rather than a tub](https://m.media-amazon.com/images/I/41Gt0Ag0yfL._SL500_.jpg)](https://www.amazon.com/dp/B0H4WBPT7M?tag=udiwg-20)

**Best for:** covering a spa you already own with a 12 x 5 x 3 m dome **Skip it if:** you are shopping for the tub itself

Worth being blunt: this listing sits in hot tub accessories, not hot tubs. It's a white inflatable dome measuring 12 x 5 x 3 m, built from 0.6 mm airtight PVC, weighing 350 lb, model 902817, supplied with a pump.

It earns a place because it answers the other half of the question. Plenty of people searching for a spa to put under glass are really trying to solve enclosure, not tub. If you already own a spa and your structure is full of tomatoes, a 12 m dome gives you a heated, sheltered space over the tub without touching the glasshouse at all. At 12 m long it's also large enough to cover a swim spa or a small pool.

The specifications are thin. Beyond the size, the 0.6 mm material and the 350 lb weight, there's nothing published: no anchoring detail, no ventilation description, no warranty. And 350 lb is a serious lump to move and site, which makes this a permanent installation rather than something you pack away.

It's the most expensive pick here, and it buys square metres rather than jets, seats or heat. Anyone who wants to soak this weekend should buy one of the five spas above instead.

**Pros:**

- Large 12 x 5 x 3 m footprint covers spa or small pool
- 0.6 mm airtight PVC construction stated
- Pump included per the listing
- Solves enclosure without altering an existing structure

**Cons:**

- Not a hot tub, so it heats nothing on its own
- Most expensive pick in this set
- 350 lb weight makes siting a multi-person job
- Single feature line published, no warranty or anchoring detail

[Check Price on Amazon](https://www.amazon.com/dp/B0H4WBPT7M?tag=udiwg-20)

## What does a glass structure change about a spa?

Amazon's search treats "greenhouses" loosely here, and none of these six listings is specified for indoor or under-glass installation. So treat the structure as your responsibility, not the manufacturer's, and judge these four points yourself before you buy.

- **Humidity.** A 228-gallon open water surface at 104°F releases a lot of moisture. Under glass with the vents shut, that condenses on every cold surface. Ridge vents, a louvre and a genuinely tight thermal cover between soaks are the difference between a pleasant room and a dripping one.
- **Floor loading.** Water is the weight, not the tub. The CO-Z's 54 lb shipping weight is irrelevant once you've added 228 gallons. Slab or paved base, level, and no timber staging.
- **Drainage.** The CO-Z lists a built-in drain system. Indoors you need somewhere for that water to go that isn't the border you just planted.
- **Chemistry and glazing.** Sanitiser vapour in a sealed space is more concentrated than outdoors. Ventilate during and after treatment.
- **Power.** A spa pump on a long extension lead run through a damp structure is a bad idea. Get a proper outdoor-rated supply installed.

## CO-Z vs Intex: which square footprint wins?

The head-to-head comes down to one measurement and one document.

**Footprint.** CO-Z is 70.9 in square, the PureSpa is 94 in square. That's 23.1 in per side. In an 8 ft wide structure, the CO-Z leaves a walkway and the PureSpa doesn't. If your clear span is 10 ft or more, the gap stops mattering and the PureSpa's extra seats start to.

**Height.** 25.6 in against 28 in. Under a sloping roof or a low eaves line, the shorter wall gives you more headroom where you actually sit.

**Weight.** 54 lb against 130.5 lb. The CO-Z is a one-person carry. The PureSpa is not.

**Documentation.** The PureSpa publishes a 1 Year Limited Warranty. The CO-Z publishes none. That's the single strongest argument for spending more.

**Capacity.** Four adults against six.

My read: the CO-Z wins on the criterion you cannot change after purchase, and the PureSpa wins on the criterion you can compensate for. You can accept a spa with no stated warranty. You cannot accept one that doesn't fit.

## What the listings do not tell you

Five gaps run through this whole comparison, and none of them is filled by any of the six pages.

1. **Running cost.** Bestway claims up to 40% better efficiency than similar tubs, and both Bestway picks state Title 20 compliance. Neither figure translates into a heating cost for your climate and usage.
2. **Noise.** Air-jet pumps are loud. Nobody publishes a decibel figure. Inside a hard-surfaced glass box, that gets amplified.
3. **Heat-up time.** Every spa here claims a 104°F ceiling. None states how long it takes to reach it from cold, which is the number that actually shapes how you use it.
4. **Liner lifespan.** PVC under direct sun through glass ages faster than PVC in dappled shade. Only the solar dome states a material thickness, at 0.6 mm.
5. **Warranty, for five of the six.** The INTEX PureSpa is the only pick here with published terms.

Buy on what's measured, then verify the rest on the live page before you commit.

## The verdict

Three tiers, three different answers.

At the entry end, the SaluSpa Cancun is the cheapest way in and claims 120 jets plus Freeze Shield cold-weather protection, but it publishes no dimensions at all. The CO-Z sits at the same tier and is the pick I'd actually buy: 70.9 x 70.9 in, 25.6 in tall, 54 lb, a 228-gallon claim for four adults. Documented, compact, light, and second-cheapest here. For a tight span it's the obvious default.

In the middle, the UHOMEPRO gets you within 2 in per side of the CO-Z's footprint plus a two-cover bundle with a child-locked thermal lid, and the SaluSpa Hawaii trades published dimensions for app scheduling and a 140-jet claim. Take the UHOMEPRO if the covers matter, the Hawaii if remote control does.

At the premium end, the INTEX PureSpa is the runner-up and the upgrade, with the only published warranty in the set, a 28 in wall and 94 x 94 in of seating for six. Its exact advantage over the CO-Z is that warranty, and the cutoff is your clear span: below 8 ft, buy the CO-Z; above it, the PureSpa. The solar dome is a 12 x 5 x 3 m enclosure and belongs in a different shopping trip entirely.

## FAQ

### Is the best hot tub for greenhouses worth buying over an outdoor spa?

The best hot tub for greenhouses is worth it if the structure solves a real problem: wind, rain and leaf fall on the water surface. The same tub costs the same either way, since none of these six is a dedicated indoor unit. What you're paying for is shelter you already own. Budget for ventilation and a hard base instead.

### How much floor space do I need for a four-person inflatable spa?

Floor space for a four-person spa starts at the published footprint plus access. The CO-Z is 70.9 x 70.9 in, so add roughly 18 in on the pump side and you're at about 8 ft by 6 ft of clear floor. The UHOMEPRO needs marginally more at 72.8 in square. The six-person PureSpa jumps to 94 x 94 in.

### CO-Z or INTEX PureSpa for a narrow structure?

CO-Z or INTEX PureSpa comes down to width. The CO-Z is 70.9 in square and 25.6 in tall against the PureSpa's 94 x 94 x 28 in. In anything under an 8 ft clear span the CO-Z is the only realistic fit. Choose the PureSpa when you have the room and want its 1 Year Limited Warranty and six seats.

### What is the cheapest way into this category?

The cheapest way into this category among these six is the Bestway SaluSpa Cancun, sized for 2 to 4 people with a claimed 120 bubble jets and Freeze Shield cold-weather protection. The catch is documentation: its listing publishes no footprint, height or weight. The CO-Z costs a little more and gives you 70.9 x 70.9 x 25.6 in and 54 lb in writing.

### Does the solar dome replace a greenhouse for a hot tub?

The solar dome replaces a greenhouse in the sense that it encloses the tub, at 12 x 5 x 3 m in 0.6 mm PVC with a pump included. It heats nothing itself and weighs 350 lb, so siting is a group job and effectively permanent. Buy it only if you already own a spa and need shelter over it.

Start by measuring the clear span inside your structure at seat height, then subtract 18 in for pump access. If what's left is under 8 ft, the CO-Z 6ft Inflatable Hot Tub is your pick, and its 70.9 x 70.9 in footprint with a 25.6 in wall is the reason. It's also the lightest box here at 54 lb, which matters more than you'd expect when the doorway is 30 in wide and there's a potting bench in the way. Check the live listing for current dimensions and included accessories before you order, then sort your base and ventilation before the box arrives.

*Last updated: September 28, 2026\. Product availability re-checked.*

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