Why is it critical to perform heat loss calculations when selecting heating equipment?

Performing heat loss calculations is essential for selecting heating equipment because it allows for the accurate matching of boiler size and heating output with the specific heat requirements of a space, particularly under varying outdoor design temperatures. This calculation takes into account factors such as insulation levels, the size of windows and doors, and the overall structure of the building, which directly influence how much heat is lost to the outside environment. By determining the heat loss accurately, a suitable boiler or heating system can be chosen that will efficiently maintain the desired indoor temperature without excessive energy use. This ensures comfort while minimizing operational costs and extending the lifespan of the heating equipment.