In a multiple heating boiler plant, how are the boilers or modules typically connected?

In a multiple heating boiler plant, the boilers or modules are typically connected in parallel. This configuration allows for efficient load sharing among the boilers, enabling them to operate simultaneously based on the heating demand. By connecting the boilers in parallel, the system can maintain efficiency, improve redundancy, and provide more consistent temperature control throughout the heating system.

When boilers are connected in parallel, each boiler can be brought online or offline as necessary without disrupting the overall system performance. This flexibility helps manage varying heating loads and minimize energy waste, as only the required number of boilers will operate to meet the demand.

Connecting the boilers in series, as suggested in one of the options, would not be practical for most heating applications, as it would significantly limit the flow of water and the overall efficiency due to the pressure drops that occur through every unit. Random connections would create an unreliable and inefficient system that would be difficult to control. Independent operation of each boiler also does not provide the benefits of coordinated operation under varying load conditions that a parallel system does.