1. The output content is different

　　1. Steam boiler: The steam boiler outputs steam, high temperature water or organic heat carrier with certain heat energy.

　　2. Hot water boiler: The hot water boiler outputs hot water of rated temperature.

2. different uses

　　1. Steam boilers: Steam boilers are mostly used in thermal power stations, ships, locomotives and industrial and mining enterprises.

　　2. Hot water boiler: Hot water boilers are mostly used in daily life, hotels, hotels, baths, etc.

3. the classification is different

　　1. Steam boilers: Steam boilers are divided into electric steam boilers, oil-fired steam boilers, gas-fired steam boilers, etc.

　　2. Hot water boilers: Hot water boilers are divided into electric hot water boilers, oil-fired hot water boilers, gas-fired hot water boilers and coal-fired hot water boilers.