http://en.wikipedia.org/wiki/Legionellosis#Prevention_of_Legionella_growth http://en.wikipedia.org/wiki/Legionellosis#Prevention_of_Leg... "Legionella will gro

http://en.wikipedia.org/wiki/Legionellosis#Prevention_of_Legionella_growth http://en.wikipedia.org/wiki/Legionellosis#Prevention_of_Leg... "Legionella will grow in water at temperatures from 20 to 50 °C (68 to 122 °F)." 130 °F sounds like a safer compromise.