采暖为北方地区住宅必不可省的功能。世界供热业有两大模式,一种是以城市集中供热和单元式建筑集中供热,一种是分户独立家庭供热和热水系统,前者发源于苏联,后者盛行于欧洲。随着新技术、新产品的出现,集中供暖方式一统天下受 Heating is an indispensable feature of residential areas in the north. There are two major modes of heating industry in the world. One is centralized heating in urban areas and central heating in unitary buildings, and the other is heating in separate homes and hot water systems. The former originates in the Soviet Union and the latter in Europe. With the advent of new technologies and new products, centralized heating systems dominate the world