Why?
The low temperatures of a radiant floor system can become a breeding ground for potentially fatal bacteria. This opinion is based upon our experience along with national, state and university studies and warnings.
Contracting potentially fatal, pneumonia-like Legionnaires' disease from hot water that isn't hot enough (Legionella is a water-borne bacterium and is the cause of Legionnaires disease).
Indeed, the federal Centers for Disease Control website ( www.cdc.gov) says that 8,000 to 18,000 people contract Legionnaires' disease each year, with the illness fatal in 5%-30% of the cases. The study recaps data documenting the presence of Legionella bacteria in residential water systems because of water heaters being set above 95°F and below 140°F is a perfect habitat for growth. Because the bacterium enjoys warm water environments, it's a potential problem in hot water distribution systems.
When your domestic hot water tank exceeds temperatures above 120°F, it is important to put in an anti scalding mixing valve to prevent scalding injuries.
We would be happy to help you with a closed system using a heat exchanger or primary/secondary loops.
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