Boilers in real life are not 100% efficient. Real life boilers have the following efficiencies: "Stoker" fired, commonly seen on locomotives and historic boilers: 50-70% depending on fireman skill, boiler condition, and fuel quality. "Package boiler", modern automatic-controlled...

I thought about storing a heated liquid (or steam) in tanks as an energy storage, as is done commonly in reality even at large scale. To generate the heat I wanted to use surplus electrical energy when it is available. However, there is no electric boiler in Factorio. Duh. While I was searching the ...