Which boiler type is typically factory-made and designed for easy transport?

The correct answer is the packaged boiler, as it is specifically designed to be factory-made, which allows for efficient production and consistency in quality. Packaged boilers come pre-assembled with necessary components, such as burners, controls, and safety devices, so they are ready for immediate installation upon arrival at the job site. This makes them highly portable compared to other boiler types, facilitating easy transport and quicker commissioning.

Unlike packaged boilers, field-erected boilers are constructed on-site, which involves assembling large components and often requires complex logistical planning, making them more challenging to transport. Shop assembled boilers are similar but generally refer to systems that may require some assembly on-site; they are not as compact and ready-to-install as packaged boilers. Pressure vessel boilers encompass a variety of designs intended for containing fluids under pressure but may not be specifically designed for ease of transport like the packaged boiler.