We make the tanks out of the galvanized steel that we twist on the construction site. We make the tank insulation in two variants. Internal and external. First variant is mineral wool isolation reinforced additionally with a trapezoidal sheet. You choose the color of the sheet by yourself. You have the whole RAL palette at your disposal. External variant is the XPS boards isolation. The tightness of the tank is guaranteed by the PVC membrane accepted for contact with drinking water.