The centre manager considered using electric cartridge heaters to boost the temperature of the water to eliminate the bacteria, until a user at the centre suggested connecting a Mini disinfection generator from DCW to the centre’s hot water system.
“We started using the Mini generator in January 2023. The hot water is now free of biofilm and Legionella, and we can keep it at the 45 degrees it is when it has gone through the heat pump. Before installing the Mini generator, we had considered replacing the gas boiler with cartridge heaters to boost the temperature. The generator means that we don’t need to do any of that, saving us on both gas and electricity. It’s a win-win situation: the water is free of Legionella, and we save on energy costs,” says centre manager, Jan Nielsen.
Jan Nielsen soon expects to scrap the gas boiler completely and instead invest in three air-to-water heat pumps for heating, as there is no longer a need to boost the water temperature to above 50 degrees.
“The boiler’s heat exchangers need replacing and that alone will cost DKK 20,000. A new boiler will cost DKK 60,000–70,000. We’d rather have air-to-water heat pumps to produce cheaper, efficient and green heat,” he explains.