Improvement type double walled kettle Jia Hot Installed set and Should Yong The Installed set plus Hot methods , The Installed set comprising the outer Pans, mono- Let Inner Pans and a Ke for setting Pans Inner outside what The remove Di Let set outside The, Inner Pans Inter Even siphunculus Single it is first. The outer Pans of The include one define Open mouthfuls of a mono- first last week Edge. The Inner Pans include one define one the 2nd Open mouthfuls of the second last week Edge, The the second, first last week of Edge be phase Inter every and cooperatively define a circulation groove mouth. The Even siphunculus Single members include one to Feng Cover The circulation groove Kou Cover plates, and an at least Ge Zi The Cover plates are towards the portions The Inner Pans Inner Yan Shen Even siphunculus. The outer Pans additions one of When whats The plus its Jia Hot Time of Hot Ye And Right, adding Hot liquid to be formed by steam can be drawn Shou The Even siphunculus Guide and directly be acted on to a cooking liquor of The Inner Pans, thereby can be improved plus Hot Xiao Shuai And Minus lack Hot Neng Damage consumptions.改良式二重釜加熱裝置及應用該裝置的加熱法,該裝置包含一外鍋、一設置於該外鍋內的內鍋,及一可移除地設置在該外、內鍋間的連通管單元。該外鍋包括一界定出一第一開口的第一上周緣。該內鍋包括一界定出一第二開口的第二上周緣,該第二、第一上周緣是相間隔且相配合地界定出一流通槽口。該連通管單元包括一用以封蓋該流通槽口的蓋板,及至少一個自該蓋板朝該內鍋內部延伸的連通管。當於該外鍋添加一加熱液並對其加熱時,加熱液所形成的蒸汽可受該連通管導引而直接作用至該內鍋的一蒸煮液,藉此可提高加熱效率並減少熱能的損耗。