The Rheem RTG20253 Recess Box Kit is specifically designed for condensing tankless water heaters, providing a secure and efficient installation solution. This kit protects the unit from environmental factors while ensuring proper ventilation. Made from durable materials, it meets industry standards for safety and performance. The compact design allows for easy installation, making it suitable for both new and retrofit applications. Enhance the efficiency and longevity of your Rheem condensing water heater with this essential recess box kit.