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Cylindrical metal cartridge heater with brass screw plug and PTFE flange, 5 3/4 inches long

Tempco

Tempco HDL00025 375W 120V Cartridge Immersion Heater hvac control

SKU CH-E889-QT45G

375 W cartridge immersion heater with Incoloy sheath and brass screw plug, 120 V single-phase, 37 W/sq in density, 266 °F control range, 3/4 in NPT fitting, epoxy-sealed leads for water use

  • 375 W output gives strong heating for water applications
  • 120 V single-phase supply fits standard North American circuits
  • 37 W/sq in density balances rapid heat-up with element life
  • Incoloy sheath resists corrosion in hot water environments
  • 266 °F control range suits industrial process temperature needs

Product Identity

The Tempco HDL00025 is a 375W cartridge immersion heater designed for direct liquid heating in HVAC and industrial control systems. It operates on 120V AC single-phase power with an Incoloy sheath and brass screw plug for corrosion resistance. The unit features a 3/4 inch NPT fitting and requires a minimum immersion depth of 4 3/4 inches. An epoxy seal at the lead end protects electrical connections from moisture ingress.

Ideal Use Cases

This heater suits applications requiring precise temperature control of water up to 266 degrees Fahrenheit. It fits systems with standard 3/4 inch NPT ports and sufficient tank depth for the 5 3/4 inch overall length. Installations needing higher wattage, three-phase power, or voltage ratings other than 120V AC should select a different model. Buyers requiring sheath materials other than Incoloy or flange materials other than PTFE must look elsewhere.

Sustained Operation

Under continuous load the heater maintains its rated 37 W/sq in watt density through the Incoloy sheath for consistent thermal transfer. The PTFE flange and epoxy-sealed lead end remain stable at the maximum 266 degree Fahrenheit control range. Brass screw plug threads resist scaling during extended immersion cycles. The single-phase design delivers steady output without the harmonic distortion associated with multi-phase units.

How it compares

Measured against everything we stock in Heating & Cooling Controllers, at today’s prices. Recalculated every night.

Price $91.99
Pricier than about 66% of the 1,762 comparable items (median $45.99).

Specifications

Product
Brand nameTEMPCO

Questions about this item

Does the 3/4 in NPT screw plug thread directly into my tank port?

Yes, the brass screw plug has a 3/4 in NPT thread and includes the plug, so it threads straight into a matching 3/4 in NPT tank opening.

Will the 120V AC single-phase supply in my older control panel run this 375W heater without changes?

The heater is rated for 120V AC single-phase, matching a standard 120V panel feed, so no voltage conversion is needed.

How can I confirm the 266°F control range is active after wiring the heater?

With power applied, the control circuit will cycle the heater to maintain temperature up to 266°F; a calibrated thermometer at the immersion point verifies the limit.

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