Lass dir keine der besten geschichten entgehen, während sie passieren. Sorry, this service is currently unavailable. We could then say that an electric steam boiler works in a similar way as a fire heated boiler, the difference being the means by which the water is heated. Another key benefit is their size since there is no requirement for a heating tank they take up hardly any room comparatively making them ideal for smaller homes and flats where space is at a premium. Source: careers directorate.