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Table 3 Average total number of planktonic L. pneumophila gene copies in each reservoir during each sampling (for each sampling, n = 18 for distal taps; n = 2–6 for tank + recirc)

From: Water heater temperature set point and water use patterns influence Legionella pneumophila and associated microorganisms at the tap

  

Baseline

Exp. 1

Exp. 2

Exp. 3

System

Reservoir

(5 months)

(8 months)

(13 months)

(15 months)

Control (always 39 °C)

Distal taps (water)

5.01E + 07

3.02E + 07

1.02E + 08

2.17E + 08

Tank + recirc (water)

1.30E + 09

2.94E + 08

7.55E + 08

1.55E + 09

Experimental

Distal taps (water)

5.60E + 07

5.92E + 06

2.44E + 07

4.98E + 06

Tank + recirc (water)

3.94E + 09

1.55E + 08

2.63E + 07

7.12E + 07

Control normalized to experimental

39 °C/39 °C

39 °C/42 °C

39 °C/51 °C

39 °C/58 °C

Total system L. pneumophila genes (water)

0.30

2.0

16.9

23.2

Tank + recirc L. pneumophila genes (water)

0.33

1.9

28.7

21.8

Distal tap L. pneumophila genes (water)

0.89

5.1

4.2

43.6