Compatible with: Heatrae Sadia Amptec Electromax Combination Cylinder and Boilers Heatrae Sadia Megaflo Unvented Cylinders Heatrae Sadia Megaflo Eco Unvented Cylinders Heatrae Sadia MegaFlo Eco SolaReady Unvented Solar Cylinders Heatrae Sadia Megaflo Eco SystemReady Unvented Cylinders Heatrae Sadia Megaflo HE Unvented Cylinders Heatrae Sadia Megaflo HE Unvented Mark 1, 2 & 3 Control Cylinders Heatrae Sadia Megatech Solar Cylinders Santon Premier Plus (MK1 Control) Cylinders Santon PremierPlus Solar Cylinders Heatstore HSU Unvented Cylinders Main Unvented Cylinders