How efficient is the coal-fired heating boiler?

Coal-fired heating boilers generally use coal-fired hot water boilers. At present, the thermal efficiency of coal-fired hot water boilers can reach 85%-89%, and the specific thermal efficiency depends on the type of coal-fired boilers, among which SHW reciprocating grate coal-fired boilers and DHL angle tube coal-fired boilers have relatively high thermal efficiency. However, coal-fired boilers below 10 tons are now prohibited. If you want to build a new coal-fired boiler, you'd better consult the local environmental protection bureau to find out the detailed boiler prohibition scope.

References:

http://www.ranmeiguolu.wang/coalFired-boiler- 160/