... 500L. 600L,700L,800L,1000L.2. Type of tank: Pressurized, vertical or horizontal, working pressure up ... more than 3 days. Installation Knowlege: 1. If tank is not full, you can add water anytime, ... 3. Before using electric heater, please make water tank full, do not use it without water inside. ... , avoiding to swell from the tank. 7. Keep the tank fully while winding. Please pull off the electric plug ...