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Calorifiers & Water Heaters
Calorifier is a fairly generic term which covers several types of equipment which produce hot water such as:-
- Immersion heaters
- Hot Water Cylinders
- Electric water heaters
- Gas fired water heaters
- Combination units
Calorifiers must store 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.
Advice on Taking the Sample
| Outlet | Drain Valve |
|---|---|
| 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. |