Modular boilers are designed as an alternative to large single boilers and offer a very efficient approach to tertiary heating. Each module can be a separate boiler installed alongside another in a horizontal arrangement, or as a vertical stack of boiler modules one above another.
It is more efficient to operate smaller boilers when the heating load is 25% to 50% of the design capacity than it is to use one large boiler to meet a partial load
Easier to install
Increase system security
Load matching and control
Cost reduction and energy savings
Managers should employ controls to stage the boilers on as required to match the load
The drawback to install multiple high-efficient boilers is the large initial capital cost. Often a high-efficient boiler is two to three times the cost of a similar capacity mid-efficient boiler. In many cases using a combination of high efficient and mid-efficient boilers in a boiler plant can achieve the same efficiency performance as a system with all high-efficient boilers.