Most hot tubs are made with an acrylic shell, usually in your choice of color. Look for the exterior cabinetry to be made of cedar, which can endure harsh weather. Removable cabinetry walls are also a plus, making the tub easier to service.

The real difference in construction technique is what kind of insulation is used under the shell. A poorly insulated tub will cause massive heat loss, the result being a higher electric bill! Newer technologies utilizing polypropylene insulation and foil-type blankets is preferred over the full foam method. Full foaming refers to filling the entire cavity with a foam, which then hardens. This type of insulation should be avoided (unfortunately, about 3/4 of the hot tubs manufactured today still utilize full foam insulation) because in the event of a leaking water line, the foam hides the plumbing lines, meaning the foam must be completely cut away just to find the leak! More labor equals a higher-priced repair. Full foaming also wastes the heat generated by the spa engine by being vented out and actually could create a nesting home for rodents and insects.