We discussed this in the question about cost of running a hot tub, but let’s go into more detail. The short answer is YES. And any retailer of a spa that is not full-foamed will tell you all about this. Here are the real facts: If there is a leak in the plumbing contained in the foam, it will take your service person a few minutes longer to find the leak. There will also be a minor cost in replacing any waterlogged foam. With that said, you’re going to be charged for a minimum of an hour for your service call. Whether they get the job done in 30 (non-full foam) verses 45 (full foam) minutes, it really doesn’t impact the cost of the repairman’s time. You will save several dollars per month with a full-foam hot tub versus a non-full-foam hot tub. If you are planning to own your hot tub for several years, the full-foam option will save money. Plus, full-foam helps to hold the plumbing in place. When your jet pump is turned on and off it gives a powerful jolt to your plumbing. If your plumbing is not locked in place with foam, this process will develop leaks in your spa over time. So, we recommend you choose the design that is more energy efficient and built to prevent leaks, not make them easier to repair – Full Foam.