... 500L. 600L,700L,800L,1000L.2. Type of tank: Pressurized, vertical or horizontal, working pressure up to ... than 3 days. Installation Knowlege: 1. If tank is not full, you can add water anytime, please add ... water after using up hot water. If tank is ... 3. Before using electric heater, please make water tank full, do not use it without water inside. For safety ...