Waste-heat installation for hot-water generation comprising at least one heating device for heating circulation water, which has a heating-device entry and a heating-device exit, a feed line suitable for circulation water with a feed temperature of above 110°C, at least one heat consumer, which has a heat-consumer entry and a heat-consumer exit, a return line for circulation water, wherein the heating-device exit and the heat-consumer entry are connected to the feed line and the heating-device entry and the heat-consumer exit are connected to the return line and a circulation pump, characterized by - the return line being suitable for conveying circulation water with a return temperature of above 105°C, - a compensating degassing apparatus suitable for a degassing pressure above atmospheric pressure, having a gas collection space and a water collection space for circulation water, - a pressure-maintaining pump, which is arranged between the compensating degassing apparatus and the return line and is suitable for constantly conveying circulation water into the return line, - a pressure-maintaining valve, which is arranged between the compensating degassing apparatus and the return line and is suitable for allowing a constant return flow of circulation water from the return line into the compensating degassing apparatus, - the compensating degassing apparatus having an inlet suitable for non-degassed water, - the compensating degassing apparatus having an opening apparatus, which is arranged in the gas collection space and is suitable for removing gases that are produced by way of degassing of the non-degassed water or circulation water, - a control and/or regulating device, which is configured to actuate and/or regulate the pressure-maintaining pump and the pressure-maintaining valve in such a way that an operating pressure of the circulation water - in the feed line and the return line - that is at all times above the steam pressure of the circulation water in the feed line is established. at least one heating device for heating circulation water, which has a heating-device entry and a heating-device exit, a feed line suitable for circulation water with a feed temperature of above 110°C, at least one heat consumer, which has a heat-consumer entry and a heat-consumer exit, a return line for circulation water, wherein the heating-device exit and the heat-consumer entry are connected to the feed line and the heating-device entry and the heat-consumer exit are connected to the return line and a circulation pump, characterized by - the return line being suitable for conveying circulation water with a return temperature of above 105°C, - a compensating degassing apparatus suitable for a degassing pressure above atmospheric pressure, having a gas collection space and a water collection space for circulation water, - a pressure-maintaining pump, which is arranged between the compensating degassing apparatus and the return line and is suitable for constantly conveying circulation water into the return line, - a pressure-maintaining valve, which is arranged between the compensating degassing apparatus and the return line and is suitable for allowing a constant return flow of circulation water from the return line into the compensating degassing apparatus, - the compensating degassing apparatus having an inlet suitable for non-degassed water, - the compensating degassing apparatus having an opening apparatus, which is arranged in the gas collection space and is suitable for removing gases that are produced by way of degassing of the non-degassed water or circulation water, - a control and/or regulating device, which is configured to actuate and/or regulate the pressure-maintaining pump and the pressure-maintaining valve in such a way that an operating pressure of the circulation water - in the feed line and the return line - that is at all times above the steam pressure of the circulation water in the feed line is established. - the return line being suitable for conveying circulation water with a return temperature of above 105°C, - a compensating degassing apparatus suitable for a degassing pressure above atmospheric pressure, having a gas collection space and a water collection space for circulation water, - a pressure-maintaining pump, which is arranged between the compensating degassing apparatus and the return line and is suitable for constantly conveying circulation water into the return line, - a pressure-maintaining valve, which is arranged between the compensating degassing apparatus and the return line and is suitable for allowing a constant return flow of circulation water from the return line into the compensating degassing apparatus, - the compensating degassing apparatus having an inlet suitable for non-degassed water, - the compensating degassing apparatus having an opening apparatus, which is arranged in the gas collection space and is suitable for removing gases that are produced by way of degassing of the non-degassed water or circulation water, - a control and/or regulating device, which is configured to actuate and/or regulate the pressure-maintaining pump and the pressure-maintaining valve in such a way that an operating pressure of the circulation water - in the feed line and the return line - that is at all times above the steam pressure of the circulation water in the feed line is established.