Where did the rubber fever come from in Hangzhou Jiande Zhongce?

1. Coal-fired, gas-fired or oil-fired boilers: The heating company will use coal-fired, gas-fired or oil-fired boilers to generate steam, and then deliver the steam to users through pipelines.

2. Thermal power plant: Thermal power companies may use the waste heat generated by thermal power plants to transport it to users through pipelines.

3. Geothermal resources: Thermal companies may use geothermal resources to convert geothermal energy into heat energy through special equipment and then deliver it to users.

4. Waste incineration power plant: The heating company can use the heat energy generated by waste incineration power plant to deliver it to users through pipelines.