| 摘要 |
<p>A self-supporting plastic material water heater, comprises an inner container (1) and an outer container (3) located inside said inner container (1) with an insulating material (5) being disposed between said containers (1, 2). The inner container (1) comprises peripheral surfaces (6, 10; 22, 23, 25) and a plurality of partitioning walls (9) intersecting with each other to form a stiffening grid structure (15) defining a plurality of compartments (11) together with said peripheral surfaces of said containers (1, 2). Opening (13) are provided in said partitioning walls (9) to form passages between adjacent compartments (11).</p> |
