Hydronic Heating Radiators – Type 11, Type 22, Type 33 admin2016-02-22T12:08:59+11:00 Today's post is going to explain the difference in radiator 'types'. There are generally three types of radiators available - Type 11, Type 22 and Hydronic Heating Radiators – Type 11, Type 22, Type 33admin2016-02-22T12:08:59+11:00