Yes, solar thermal tubes can indeed be integrated with existing hot water systems. They can work as a supplemental or pre-heating source for your current hot water setup. The solar thermal tubes heat the water before it enters your conventional water heater or boiler, reducing the workload of the traditional system and thus saving energy. This integration can be relatively seamless, with the addition of a solar collector and some plumbing adjustments. It’s recommended to consult with a professional installer, like Nationwide Energy Solutions Ltd., to assess the compatibility of your existing system and design an effective integration for optimal efficiency and cost savings.