As before, but with thermostat and stepless regulation of the thermostat temperature.
Once this is reached, the heater switches back to the lowest heating level (2.5 kW).
Technical data: Nominal heat load 4200 W, heat output 2500 - 4200 W, heating levels infinitely variable, gas consumption 181 - 305 g/h, nominal connection pressure 50 mbar, cylinder size max. 11 kg.