hello would like to install me a webasto thermo top c or p. it is enough for me if it is only heated up. if it is installed as a stand-up heater, so that it also runs on its own, can it continue to be used as a heater? if I don’t have a control element now what then?? (only heater?) if I want to retrofit a remote control later on that’s possible? (expensive?) would also be pleased about experiences with self-installation. before all electrics. socst have I ne kfz mech der das kann mfg