It's a big risk because most people that get Legionnaires get Pneumonia. A few years ago my neighbor got Pnemonia and almost died. He was 41, fit, and otherwi

It's a big risk because most people that get Legionnaires get Pneumonia. A few years ago my neighbor got Pnemonia and almost died. He was 41, fit, and otherwise healthy. It's nasty business, and you do not want to risk it just to save a few bucks a year. If you want to do your part, go out and buy a new efficient tank, or even a tankless heater. Both of them will save you a bundle over that older model.