How big are the units?

The sizes vary depending on which model you go for. The heat batteries come in 4 sizes and the one you go for will depend on the size of your property and how many water outlets you have. You can refer to the product listing to find out which option would work best in your property.
See below the sizes for each size (Depth x Width x Height):
Model 70 – 575mm x 365mm x 440mm
Weight: 79kg
Model 150 – 575mm x 365mm x 640mm
Weight: 139kg
Model 210 – 575mm x 365mm x 870mm
Weight: 178kg
Model 300 – 575mm x 365mm x 1050mm
Weight: 233kg
In comparison to standard water tank heaters, Thermino heat batteries are up to 4 x smaller than the hot water cylinder they replace.