Abstract
In the Netherlands, 45% of older persons (65+) live in apartments. An increasing number of apartments is equipped with floor heating to achieve added thermal comfort. Since the incidence of Legionnaire’s disease is 8 times higher among older adults (65+) as compared to the 15-45 yrs cohort, it is clear that we should take special care of Legionella abatement for the older cohorts [1]. Another trend in housing construction is the use of poly-ethylene (PEX) piping for potable water systems instead of copper ones. The threshold temperature for noxious Legionella growth on PEX is lower (20°C) as compared to copper surfaces (25°C) [2]. Since potable water piping runs through the same floors as the floor heating system, an additional risk for Legionella growth arises. In this study we investigate if the renewed use of copper piping can significantly reduce the additional risk of floor heating in dwellings for older adults
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