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Posted by Rod Speed on March 29, 2008, 10:38 pm
> Bill wrote:
>> "Logan Shaw" wrote in message
>>> There's only one thing that I'd want to verify: what kind of germs
>>> are going to grow in water that is above 70F but below the
>>> temperature of a regular water heater's tank? They say one reason
>>> not to turn your water heater's thermostat too low is that the
>>> lower temperatures encourage germs to multiply. If that's true, it
>>> seems like this might apply to the tank next to your wood stove.
>
>> The water is from the city and is chlorinated.
>
> All right, I did some more research. From what I could dig up, the
> "growth range" for Legionella bacteria is 20C to 50C (68F to 122F)
> and the "ideal growth range" is 35C to 46C (95F to 115F). That
> information is from here:
>
> http://www.relianceworldwide.com/site/fs_legionella.htm
>
> As to whether chlorination kills it, the same site says that a
> concentration of 10 mg/L will do the trick. According to what
> I could find other places, chlorinated drinking water seems to
> contain chlorine in a concentration of something more like
> 0.5 mg/L. But it may have been initially treated with a much
> higher level, something on the order of 5 mg/L to 10 mg/L.
>
> Here's a site that talks about chlorinating well water:
>
> http://www.water-research.net/watertreatment/chlorination.htm
>
> So, I don't know, you may be safe. If they kill the bacteria
> before they send the water down the pipe to your house, there
> wouldn't be any worry as long as nothing reintroduces it anywhere
> in the distribution network. But whether that happens is beyond my expertise.
That last does happen. Which is why the recommendation on the temperature of
storage hot water systems.
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