Watt-Flex® Cartridge Heaters | Better than Conventional Cartridge Heaters

When you choose the Watt-Flex Cartridge Heater by Dalton Electric Heating Co., Inc., you are choosing the best cartridge heater in the industry. Here are several of the features and benefits.

Maximum Heat Transfer

The unique split-sheath design of the Watt-Flex Cartridge Heater allows for the independent, bilateral expansion of each half of the heater outward against the walls of the surrounding bore.

The result is greatly improved heat transfer under normal fit conditions of .005" to .007", assuring superior heat transfer, more uniform process heat, greater efficiency, and reduced consumption of electricity. If bores are oversized from previous use and drill-outs, the bilateral sheath expansion will maximize heater-to-bore contact for the most efficient conduction heating.

  Conventional Cartridge Heater   Watt-Flex Heater Energized   Watt-Flex Heater De-energized
Limited to ordinary thermal expansion, cannot compensate for oversized bores.   The unique bi-lateral expansion of an energized Watt-Flex cartridge heater produces superior metal-to-metal contact with the surrounding bore, thereby maximizing heat transfer.   When de-energized, the Watt-Flex heater contracts for easy removal from bore.

Better Than Conventional Cartridge Heaters

Conventional cartridge heaters are limited to ordinary thermal expansion and cannot compensate for oversized bores. The Watt-Flex, on the other hand, is able to produce superior metal-to-metal contact with the surrounding bore, thereby maximizing heat transfer. When it's de-energized, the Watt-Flex Cartridge Heater contracts for easy removal from the bore.

Watt-Flex Heaters Last Longer

Cartridge heater life is directly related to its internal operating temperature. The Watt-Flex Cartridge Heaters run substantially cooler and have a more uniform temperature profile than conventional heaters. Because of this, Watt-Flex heaters last up to 5 times longer, have less downtime, and have lower operating costs than conventional cartridge heaters.

Efficient Heat Transfer

The high-purity MgO dielectric in Watt-Flex heaters is compacted to extreme density, ensuring maximum heat transfer away from the core to the heater sheath. As the energized split-sheath expands, it creates intimate contact with the bore wall, efficiently transferring heater sheath to the host metal.

Conventional ceramic core cartridge heaters (shown below) use multiple heating cores that can independently burn out, causing a cold section on the sheath. And voids of coil at core junctions produce cold sections on the heater profile.

Unlike conventional ceramic heaters, Watt-Flex heaters use a continuous heating coil to achieve a more uniform temperature profile. With Watt-Flex heaters, there are no independent heating element sections to burn out. Watt-Flex heaters are either totally on or totally off.

Watt-Flex Cartridge Heaters Eliminate Bore Seizure

The patented split-sheath design of the Watt-Flex Cartridge Heater reduces your heater change-out costs by preventing heater bore seizure. Dalton Electric will replace, free of charge, any Watt-Flex heater that cannot be withdrawn from the bore.

What Causes Conventional Heaters to Warp and Bind?

In conventional cylindrical heaters, temperature can vary from one side of the heater diameter to the other. These differentials are caused by heat deflection within a close fitting bore, and are the most frequent cause of heater warping and binding during removal.

How the Watt-Flex Split-Sheath Prevents Bore Seizure

With the Watt-Flex heaters' unique split-sheath design, each half of the heater expands and contracts independently. When energized, the heater expands to make intimate contact with the bore wall. When de-energized, the sheath contracts for ease of removal.

Dalton Electric's standard warranty covers the removal of Watt-Flex heaters from bores, provided that the bore fir is a minimum of 0.005" and there is no bore contamination to cause seizure.

Contact us to learn more about the benefits of the Watt-Flex Cartridge Heater.

Bore Seizure

Uneven Heat

Cost of Heating