ELECTRIC IMMERSION HEATERS

When you’re selecting an electric immersion heater, it is important to consider the quality of the water you’ll be heating. This will affect the element material and watt density. The quality of tap water can vary considerably, from soft water to very hard or aggressive water. Even if you’re in a soft water area, introducing additives, such as sterilising chemicals, can affect the water quality.  Our application guide will attempt to guide you to an immersion heater that will suit your water quality.

Products

Immersion heater design fall into three main categories: fixed elements, glanded replaceable elements and removable core elements.

• Fixed elements are brazed into the boss or heater flange.  An individual element cannot be replaced and instead the whole heater requires to be replaced.
• Glanded replaceable elements are fixed into the element plate using special glands.  If these elements fail they can be replaced but first the vessel requires to be drained and the immersion heater removed from the vessel.
• Removable Core elements are fitted in metal tubes.  If the element fails the element can be replaced without requiring the vessel to be drained and the immersion heater removed.  Removable core elements also have low watts densities which tends to make them more resistant to corrosion.   It should be noted that removable core heaters are much larger and more expensive than the equivalent fixed or glanded element heater.

The product literature will refer to which type of element fixing is utilised in the construction of the particular immersion heater range.

Speak to us first

If your immersion heater is being used with very hard or aggressive water, sea water, or water containing additives, speak to our Technical Department.