Insulation tanks refer to the addition of special industrial and insulation materials in the sandwich of the tank, so that the tank can maintain a certain temperature to meet the needs of life or industry. Insulation tanks can be divided into: stainless steel insulation tanks, pressure-retaining insulation tanks, and fiberglass insulation tanks, depending on the materials used. Insulation tanks are divided into: cylindrical heat tanks and modular splicing tanks. Cylindrical tanks can generally do 1-12 tons, and then the large volume can be modular splicing tanks. Module splicing water tank refers to welding with 1M*1M and 1m*0.5m stainless steel plates. It is composed of a high water tank, a storage tank and a low water tank. The high water tank is provided with a mechanically controlled water distributor, a flush valve, a drain valve, and an electrode float switch. The valve seats of the water retainer and the flush valve are respectively connected to a three-way flush pipe installed in the storage tank, and the water is discharged. The valve is opened, and the high water tank is connected with the storage tank; a lever type float switch is arranged in the low water tank, the float valve core is opened, the storage tank is connected with the low water tank; the submersible pump, the filter and the sewage pipe are also arranged in the low water tank, and the submersible pump outlet pipe The port is located in the high water tank, and the submersible pump is turned off by the electrode float switch in the high tank. The use of medium water tanks can save a large amount of clean water for drinking, with significant social and economic benefits. The water tank can be used with all kinds of existing toilets. For large-scale hotels, restaurants, enterprises and institutions can be installed and used.