After researching most brands sold here in Oregon, I finally made the decision on the Columbia Spa brand, built locally in Oregon. The spa uses top of the line electronics and pumps. The box is 2x4 construction with foam-board insulation and foam on shell to support plumbing. It is accessible from all sides for any future repairs. If your looking for a spa that will not break your piggy-bank, this is a great hot tub for the money.