An ink jet print head has first nozzles (10) of a first diameter for ejecting droplets of ink having a first mass, and second nozzles (12) of a second diameter for ejecting droplets of ink having a second mass. The first diameter is larger than the second diameter, and the first mass is larger than the second mass. First and second heater-switch pairs are connected in parallel on a substrate of the print head. The first heater-switch pairs include first heaters adjacent corresponding first nozzles, and the second heater-switch pairs include second heaters adjacent corresponding second nozzles. The first (14) and second (16) heaters are composed of electrically resistive material occupying first and second heater areas on the substrate (4).