An inflatable hot tub is definitely at the smaller end of the “size” spectrum. When the specifications declare it's a 4-person hot tub, what that really means is 2 children and 2 adults all sitting close together, or 4 adults all sitting very close together. The average 4-person blow up hot tub that holds around 200-250 gallons is best thought of as a 2-person hot tub, with plenty of room to stretch out and relax. That’s not to say that any more people is out of the question, but more than 2 and you’re likely to find yourself making contact with someone else. For some this closeness may not be a problem.
Your inflatable hot tub should not be placed in an environment with temperatures less than 4ºC or 40ºF. This can cause irreversible damage to your hot tub’s pump and heater. If your inflatable hot tub is placed in your patio, backyard or lawn, it is best to transfer it to a warmer location inside your home or just pack and store it away during the winter season.
We have been reviewing inflatable hot tubs since 2015. In that time we have spent more than 40 hours researching them to find the best portable hot tubs on the market. The best hot tub we found was the Coleman Lay-Z-Spa 54131E. The Coleman hot tub is attractive and built for durability with a synthetic leather exterior, polyester-mesh-enforced PVC walls and vertical beams to prevent it from buckling and bending after repeated use. It has 120 bubble jets and can heat to 104 degrees Fahrenheit, and it can fit up to six adults.  
This product fit's the Coleman Lazy Spa very well. The cover does not fit over it very well so I suggest removing it before attaching the cover, otherwise it will just get knocked loose when you remove the cover, and you will have to put it back on. We set a small light on it and two 12oz adult beverages, and had no problems with it being unstable. I will probably purchase one more.

And since you will be using the same water for a long while, all the best models come with a chemical floater dispenser which will treat the water and block the formation of algae deposits.All inflatable hot tubs come with the pump system to inflate the set, and all that is automated, so all you have to do is connect the tubes and let it inflate by itself. These hot tubs also are designed with an electrical controller to set all adjustments of water temperature, stirring and filtering for the amount of time you wish.
Intex’s PureSpa Bubble Massage hot tub is a very spacious tub by pretty much all standards, managing to accommodate up to four people at the same time. It also benefits from a built-in hard water treatment system that makes water more gentle and an insulated cover with a lock to minimize heat loss. At the same time, the tub uses a PureSpa patented heating system, a 3-way test strip, a floating pool chlorine dispenser, a thermal ground cloth, an inflation hose, and two filter cartridges.
At first, we were unsure of an inflatable hot tub. We were even concerned that it may look cheap or not hold up. I mean you get this vision of someone sitting on the edge and it popping, flooding your backyard during a relaxing time or a fun party. But after doing our research and now becoming owners, well, just let that vision fade away because that is not what these inflatable Lay-Z-Spa hot tubs are all about.
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