Multiple layers of polymer foam form structural concrete into a desired planar shape that retains a foam panel when flat or upright. A pressure control valve communicates with the feed device, a dosing pump is fluidically connected to the pressure control valve, a driving motor that drives the dosing pump, a discharge valve discharges the medium as a volume flow modifiable over time. After identification of the type of glow plug, stored sets of parameters, which correspond to the type of glow plug determined, are likewise called upon to control the glow plugs.