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Rainwater batch heaters and pathogens

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If I built a small, rainwater collection system that fed directly into a batch heater that might sit full of rainwater for a few days before taking a shower, being heated by the sun, can anyone think of problems with pathogens that might grow? I read the thread on Legionnaires disease and still am not clear on wheter it is in rain water. Any help? Thanks, Morgan.
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Location: Alaska
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Sunlight prevents its growth, and airation of the water does as well. Also if the water is above 120f or under 60f
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Location: FL
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from Treehugger.com

Legionnaires Disease, or Legeionellosis, is caused by "Legionella pneumophila, a ubiquitous aquatic organism that thrives in warm environments." It was identified after 34 veterans died after attending an American Legion Convention in the Bellevue-Stratford Hotel in Philadelphia in 1976. It is temperature sensitive:

    * 70 to 80 °C (158 to 176 °F): Disinfection range
    * At 66 °C (151 °F): Legionellae die within 2 minutes
    * At 60 °C (140 °F): Legionellae die within 32 minutes
    * At 55 °C (131 °F): Legionellae die within 5 to 6 hours
    * Above 50 °C (122 °F): They can survive but do not multiply
    * 35 to 46 °C (95 to 115 °F): Ideal growth range
    * 20 to 50 °C (68 to 122 °F): Legionellae growth range
    * Below 20 °C (68 °F): Legionellae can survive but are dormant

I have a 55 gallon drun in the grenhouse which if filled with water.  i pump it through a loop layin gin the sun, back to the tank.  The tanks typically heats up to 120 degrees.  The top is open and the water is not cycled or changed out.  I get some growth in there, mostly on the bottom.

UV radiation can destroy bacteria in just a couple of hours.  The depth of water that the sunlight must penetrate will reduce the UV rays that reach the core of a tank.  A shallow pan with large surface area covered with glass can go a long way to destroying bacteria.
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