This motorised zone valve from Drayton is an excellent addition to your heating system. It is specifically designed for use with storage tank water heaters and comes in a 28mm size. The valve features two ports and is powered by a 6-wire actuator. With this valve, you can easily control the flow of water to different areas of your home, ensuring that each room is heated to your desired temperature. It is a reliable and efficient solution for managing your heating system. The Drayton ZA6 / 779-2 motorised zone valve is perfect for those looking to enhance their home's heating capabilities.