ALTERNATIVE, ALTERNATIVENERGIE, BIRGIT, CONSUMPTION, COSTS, ELECTRIC, ELECTRICITY, ENERGIEVERSORGER, ENERGY, GAS, GRASMATTE, HEAT, HEIZTECHNIK, HEIZUNGSREGLER, KOENERGIE, NONPOLLUTING, OF, POWER, REGENERATIVE, REGULATE, REITZ-HOFMANN, RULES, SCALE, SUPPLY, THERMOSTAT, THERMOSTATVENTIL, VALVE,