.Learn More Straw Burning Hot Water Boiler | Streblenergy.com Straw Burning Hot Water Boiler | Streblenergy.comLearn More Straw to Energy - Hermes EPC Group The straw boiler is built as a natural circulation boiler. The water which reached a high level of pressure caused by the feed water pump vaporizes in the walls of the boiler. This vapor is heated up to the final, required temperature by the super heater in the steam drum and is fed to the turbine.Learn More 