Would my Megaflow hot water storage cylinder (unvented) be compatible with your Solar Thermal Sunstation or would I require a new boiler?
Megaflow cylinders are not designed to accept pre-heated water from ANY solar system. The inlet control valve on a Megaflow unvented cylinder is only designed to accept water upto approx 30’C. Changing the valve invalidates the guarantee on the cylinder. Megaflow are introducing a twin coil cylinder in the near future. A replacement twin coil cylinder (NOT a new boiler!!!) would be necessary to install a solar system.