If you lag your hot water tank, you'll save money on your fuel bills.如果你给热水箱装上外套，你就可以少付燃料费帐了。The hot water tank should be insulated with proper insulating materials.热水箱应该使用适宜的隔热材料进行保温处理。If you lag your hot water tank, you'll save money on fuel bills.如果给热水箱装上绝热层，就能节省燃料费。