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.
