... 500L. 600L,700L,800L,1000L.2. Type of tank: Pressurized, vertical or horizontal, working pressure up to ... more than 3 days. Installation Knowlege: 1. If tank is not full, you can add water anytime, please ... 3. Before using electric heater, please make water tank full, do not use it without water inside. ... and raining. 8. In winter, keep the pipeline insulated to protect it from freezing in cold area ...