Yes, Clamps Are Necessary
The vast majority of hot tubs companies DO NOT clamp their plumbing lines!
Yes, you read that right - most manufacturers do not clamp their plumbing lines. Why not? Because you, the customer, can’t see the lines when you’re shopping for a hot tub and the savings in clamps and labor means millions over the course fo a year with all of that cash going right to the bottom line!
If you are building a home then, at some point during construction, a plumbing inspector will come and inspect the plumbing and, if they see any soft hose plumbing joints without clamps, the inspection will fail until clamps have been added to all soft lines. That’s because the home building industry is regulated so inspections are done pretty much every step of the way and a core component of a properly built plumbing system is clamps at every joint where a softer style hose is used.
The hot tub industry on the other hand is not regulated so manufacturers can do pretty much anything they want and that means that most manufacturers forego clamps on all the lines knowing that glue alone will prevent leaks for the first 5-7 years until the warranty has expired. The problem with a lack of clamps is that with hot water running through the hoses, the hoses are going to get softer and water will work its way up between the hose and the barbed fitting on the jet. Over time that will cause the glue between the hose and the jet fitting to break down and in seven or eight years you’ll be dealing with a leak and keep in mind that every jet in a hot tub will have two joints, one at the manifold and one at the jet. So that means if you have a hot tub that has, for example 40 jets, you have 80 potential leak points. On the other hand a properly clamped line is never going to leak because the line is crimped it onto the jet fitting and there is no way that water is going to work its way past the clamp.
Some manufacturers have moved away from standard vinyl hose with clamps towards a product called Shur-Grip and this is simply slightly more rigid hose with a spiral reinforcement and these hoses are better than unclamped vinyl but make no mistake even this type of hose without a clamp can’t measure up to a properly clamped plumbing joint.
So when you’re out hot tub shopping tell the salesperson to pull aside off the hot tub and have a look for clamps on the hoses which run from the manifolds to the jets. If you don’t see spring type clamps on all the joints then you’re looking at a tub which is going to leak at some point so it’s time to look somewhere else.