A heater , comprising a burner device , a combustion air blower , a circulating air blower , a control device and a data storage device , wherein the combustion air blower feeds combustion air to the burner device , wherein the burner device burns a gas-air mixture consisting of the combustion air and a gaseous fuel or a fuel converted into a gaseous state, wherein the burner device at least serves for the heating of air, wherein the circulating air blower discharges heated air from the heater , wherein the control device acts on at least one component of the heater , wherein at least one night mode parameter set associated with an operation of the heater in a night mode and a default parameter set associated with an operation of the heater in a mode different from the night mode are stored in the data storage device , wherein the control device is configured to access the associated night mode parameter set and use it for acting on the at least one component after activation of the night mode, wherein the night mode parameter set effects a reduction of a background noise generated by the heater , characterized in that a fluid container is present, wherein the burner device serves for the heating of air and additionally also for heating a fluid contained in the fluid container , wherein the control device is configured to take a prioritization from the night mode parameter set, and wherein in the case that air and fluid are to be heated at the same time, the control device acts on the component of the heater in dependence on the prioritization such that a thermal energy generated by the burner device primarily serves for heating the air or for heating the fluid. comprising a burner device , a combustion air blower , a circulating air blower , a control device and a data storage device , wherein the combustion air blower feeds combustion air to the burner device , wherein the burner device burns a gas-air mixture consisting of the combustion air and a gaseous fuel or a fuel converted into a gaseous state, wherein the burner device at least serves for the heating of air, wherein the circulating air blower discharges heated air from the heater , wherein the control device acts on at least one component of the heater , wherein at least one night mode parameter set associated with an operation of the heater in a night mode and a default parameter set associated with an operation of the heater in a mode different from the night mode are stored in the data storage device , wherein the control device is configured to access the associated night mode parameter set and use it for acting on the at least one component after activation of the night mode, wherein the night mode parameter set effects a reduction of a background noise generated by the heater , characterized in that a fluid container is present, wherein the burner device serves for the heating of air and additionally also for heating a fluid contained in the fluid container , wherein the control device is configured to take a prioritization from the night mode parameter set, and wherein in the case that air and fluid are to be heated at the same time, the control device acts on the component of the heater in dependence on the prioritization such that a thermal energy generated by the burner device primarily serves for heating the air or for heating the fluid. <EOS>