Calorifiers store provide water at 60°C minimum.
Most calorifiers have the cold inlet at the bottom so the water nearer the base is much cooler, often a perfect temperature for legionella growth. So it’s important that the remainder of the stored water is hot enough to deactivate or kill the legionella within a few minutes.
If the stored temperature is not high enough, it permits legionella bacteria to be distributed around the property and colonise taps and showers.
|If there is not a sample point on the outlet pipework, use the FIRST direct fed hot water outlet.
|Water can be taken from the bottom drain valve (if fitted).
|The result will show if there are legionella living in the stored hot water.
|The result will also show if there are legionella living in the stored hot water.