FAQ FOR IMMERSION HEATERS

FAQs

What kind of immersion heater do I need?
Depending on your application, there are a variety of different models to chose from. For smaller applications, screw plug heaters are useful for their low cost and ease of replacement.  For larger applications flanged heaters are used for their ability to handle high loads of power and larger volume of liquids. For applications that require elements from the top of a container, over the side heaters are selected.  Each product has the option of coming with a mechanical thermostat or a digital controller for more precise temperature requirements. Standard NEMA 1 terminal housing is always available, NEMA 4 moisture-proof and NEMA 7 explosion proof housing for more volatile environments.

How often should I maintain the heater?
Heaters should be maintained on a regular basis. Depending on the medium you are heating, each application should be thought out carefully. Water based liquids might have calcium deposits that stick to the sheath and, would require frequent maintenance. Heavy water should be treated to prevent calcium deposit (normally identified as a white powdered substance) from sticking on the individual elements.

Do I need a high limit safety switch?
High limit safety switches are an inexpensive and valuable tool to help protect heaters and the solution you are trying to heat up. Often inserted into a thermowell within the bundle of elements, they are set to a maximum temperature range that would shut off in case of overheating.

Do I need a mechanical thermostat or a digital controller?
Mechanical thermostats are an inexpensive tool to set your temperature of your heater using a capillary and bulb that is inserted in a thermowell within your heater. The limitations of this device are the amperage load it can handle (often around 15 Amps for a 3 phase, and 25 amps for single phase). Applications that require more precise measurements use digital controllers that have relays, fuses, contactors and are available in standard NEMA 1 terminal housing, NEMA 4 moisture-proof and NEMA 7 explosion proof housing for more volatile environments.

If I have a sample from another company, can Wattco make it?
Our facilities offer the flexibility of making most any heater in the market. We would normally require the sample to be sent to us to verify dimensions, power rating etc…

What is the warranty of your heaters?
Wattco offers a 1 year warranty against manufacturing defect. Please see our Terms and conditions for more information.

What is Watt density?
Watt density (WPSI) is a term used in the heating industry that describes the amount of permissible wattage over a surface area of a heater. Water has a typical watt density of 65 WPSI where as Oil would have much less because of its viscosity. When ordering a heater, it is always important to indicate to our sales group the medium for which you are heating.

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