Main Unvented Hot Water Cylinders are designed help save the environment and minimise fuel bills. Designed to work with Main Eco Elite System boilers, providing the complete solution for your project. The indirect heating coil is fitted with an electric immersion heater as back up, so you can be confident of having hot water, whenever you need it. The cylinders are easy to install, with front access to controls and connections. The coil-in-coil heat exchanger ensures rapid heat recovery and 50mm of factory injected polyurethane foam ensures that heat loss and running costs are kept to a minimum. The high grade stainless steel inner cylinder ensures a long product life with low maintenance.