Ceramic heaters for test rig

My current project requires producing a test rig for testing and optimising different cooling methods of an electric motor powertrain inverter.For this we are going to require heaters to represent the heat energy given off by the power modules which is roughly in the range of 2kW at maximum output.We will need to provide this 3x2kW output on an area measuring 210x133.5mm or 3 lots of 70x133.5mm. The number of heating elements can vary in order to meet this need while using an \\\'off the shelf\\\' solution. We are looking to vary heat output via voltage control.Any advice on product selection would be useful.Let me know what you think.Once a product has been determined I would like to request a quote.