A complete boiler is as opposed to the traditional assembled boiler, where the traditional assembled boiler consists of transporting the boiler body and individual components to the site for assembly after factory production. The complete boiler, in addition to the basic components, also includes the base and supports, which are already assembled and secured with the base and supports before shipment. Upon arrival at the site, only overall installation and connection of external pipelines are required, significantly reducing the installation time at the construction site compared to the assembled boiler, while also improving the quality of the boiler installation.