Look for spa manufacturers that use certified manufacturing practices, namely ISO9001 Certification. ISO has developed more than 17,000 International Standards on a variety of subjects and 1,100 new ISO standards are published every year.
Spa manufacturers - Warranties: Additionally, you'll want to take a very close look at the hot tub warranty. Keep in mind that just as when you buy a car, you'll have a relationship with your hot tub dealer and spa manufacturer for years. Your dealer will be servicing your hot tub, selling you chemicals and accessories, and acting as your spa consultant should you ever need one.
Take time to ask your friends, neighbors, or others in your community about hot tub manufacturers and local dealers. Buy a product with a sound reputation from a dealer who has a well-established business in your community.
You'll find peace of mind from dealing with someone you can rely on for advice.