SunSwell 73-Inch Square Hot Tub

In this sunswell 73-inch square hot tub review, the verdict is simple: this is the best square inflatable spa under $550 for buyers who want a corner-friendly footprint. SunSwell sells it for $539.99, and it holds 4.2 stars from 63 Amazon ratings, ranking number 9 in Amazon Outdoor Hot Tubs. The 73-inch by 73-inch square shape and the 25.6-inch wall height make it the pick for small patios, decks and balconies, because straight edges sit flush against a fence or railing. It fits 4 to 6 adults, so couples, small families and anyone who hosts a few friends get real use from it. Meanwhile, shoppers who need app control or cold-weather protection should look at other models in the guide.

The numbers on this spa translate into real evenings in the water. The 600W motor drives 130 bubble jets, which means a full-body bubble massage rather than the targeted nozzles found on pricier models. Water heats to 104 degrees Fahrenheit, and the insulated cover with a child safety lock holds that heat between soaks, which cuts both warm-up time and running costs. On top of that, the laminated PVC wall resists punctures better than ordinary PVC, a useful trait when kids, pets and patio chairs are nearby. Assembly is genuinely quick: plug the heater pump into a standard AC outlet, press one button, and the tub inflates in minutes. The built-in removable filter keeps the water cleaner with minimal fuss. Even so, the 25.6-inch depth is shallower than some rivals, so tall users sit with shoulders exposed.

At $539.99, the SunSwell square hot tub undercuts every round 6-person spa in our guide while offering the same 104-degree heat and a comparable jet count. Because of that, the value case is strong for anyone who wants a square tub that tucks into a corner instead of dominating the yard. However, honest trade-offs exist: there is no app control and no freeze protection, so buyers in cold states should treat it as a three-season spa and drain it before the first hard freeze. By contrast, the round Coleman models run taller walls, which some users prefer for deeper soaking. Still, if you want a square, portable, 4-to-6 person hot tub for less than $550, this is the one to get.