How do I know how many BTUs i need for a gas boiler to heat my home?
The only way to determine what your actual requirement is to have a heat load done on your home by a qualified heating technician. This calculation looks at the size of the structure, insulation, doors and windows along with your climate area for outdoor design temperature. A heat loss is then calculated to determine what is required for the boiler and the heating elements to heat the structure. It is an exercise worth the time and effort to know that you have the sufficient sized equipment and radiation to do the required job next winter, with out over sizing the unit and loosing efficiency.