The immersion i fitted only heats it upto about 30/40 but lower out of the brush.........Legionaries needs bacteria to help grow.algae,sludge,metal etc all of which i dont have in my tank.....it is also found in car washer bottles and radiators. Its also found in rivers,streams and canals.
New research from the US has identified home hot water pipes and domestic hot water systems as a common source of Legionnaires’ disease. Although more often associated with the air conditioning systems fitted to hospitals and large office buildings, Janet Stout, a microbiologist at the Veterans Administration Medical Center in Pittsburgh said "The evidence suggests that the residential water system is an under appreciated source of Legionnaires’ disease".
Waterfed pole tanks also get heated up in the summer when people go on holiday and leave water in the tank that a huge no no for legionaries disease to grow
Where do we stop..... swimming pools,air conditioned offices , etc etc etc etc
Its not just about heating water to a certain temp it also has to be able to breed from water storage sources that have the above mentioned not just by heating the water. But we could go on all day over and over .... ive seen more people use their mobiles and put my life at risk that way than me heating the water for a short peopriod of time ie....a few days here and there through this winter.