In the past, local heating was mainly provided by decentralized small boilers mostly using coal, which has low thermal efficiency and wastes energy, putting pressure on local environmental protection during winter heating season.

过去，当地供暖主要由分散式小锅炉提供，主要使用煤炭，热效率低，浪费能源，冬季供暖时，给当地环境保护带来压力。