4 ms·

I've read that turning down the temperature in the tank can increase the risk of Legionnaires disease. I don't know how much of a risk that actually is, though

• kordless 16y ago
  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.
  • Swannie 16y ago
    +1 for the tankless heater +1 for the efficient tank Great hack, but get a modern heater and a shiny micro controller for it, that may even speak ZigBee or some other home automation protocol.
• bhousel 16y ago
  Yes this is true.. Another thing that people don't usually consider is that any hot water system actually contains a gradient of temperatures, all the way from whatever your water heater is set at, down to almost room temperature where the faucet is. Somewhere along that gradient is the temperature that Legionellae will thrive, so it's a good idea to let the hot water run until it comes up to temperature before using that water.