Chinese Patent, high heat efficiency, long service life, no leakage of water in the tube, scaling resistance, no tube explosion Water tank inner cylinder: thickened SUS304 stainless inner cylinder, diameter Φ360mm, thickness δ=0.31mmWater tank outer cylinder: white pearl board, diameter Φ470mm, thicknessδ=0.32mmInsulated layer: adopting full-automatic constant temperature quantitative foaming ...