The firetube boiler is designed around its furnace and tube passes and many different arrangements have been evolved. In this type of boiler, efficiency is far higher than in the simple shell type of boiler due to the increased heat absorption surface, therefore the output for the same dimensions increases and the fuel consumption is reduced.
Fuel-fired steam boilers, or fire-tube boilers, are widely used across industries due to their efficiency, cost-effectiveness, and versatility.
In summary, fuel-fired steam boilers remain a dominant choice due to their efficiency, adaptability, and long-term cost benefits.