Water heaters located in unconditioned spaces (i.e., attics, basements, etc.) may require the water piping and drain piping to be insulated to protect against freezing.

• 如果热水器安装在不具备条件的地方（如：阁楼，地下室，等等），可能要求水管和排水管加装保温层以防止被冻结。