What are the differences between commercial and domestic boilers?

The boiler industry distinguishes between domestic and commercial boilers. A boiler is considered domestic if it is with the range of a 70 kW maximum limit. Any installation above 70kw is considered commercial. This is measured by the installation as opposed to the range of an individual boiler. An installation of two 50kw boilers which are connected to the same system is considered to be a commercial installation as the total amount of kW is higher than 70.