Upgrade your spa with reliable performance and modern convenience. This BP5 Water Pro 3-Load Retro-Fit Spa Control Kit is designed for easy installation, efficient operation, and long lasting durability. Featuring a fixed 15" heater assembly, it provides consistent water heating to keep your spa comfortable. The included TP600 topside control makes operation simple with access to standard, economy, and sleep modes. A built-in heater-on indicator light ensures you always know when your spa is actively heating, while freeze protection safeguards against cold weather damage.