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Watlow
Watlow WATROD Duct Heater
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Watlow WATROD duct heater: non-pressurized air to 1200 °F class, 0.430 in elements. RFQ + selection help.
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Key parameters
Measuring range
Non-pressurized air heating; process temperatures to 1200 °F class per HAN-DH-0618 duct heater sheet
Accuracy
N/A (heater assembly)
Output
N/A (heating assembly; optional thermostats for control)
Supply
Up to 600 VAC class per duct heater specification sheet
Ambient temperature
Per Watlow duct heater application limits
Mounting
Modular air duct heater packages for non-pressurized systems
Fits non-pressurized duct air heating when you need a Watlow WATROD-based D / LDH modular package with 0.430 in tubular elements and process temperatures to the 1200 °F class per HAN-DH-0618.
Key advantages
- Non-pressurized duct air — process temperatures to 1200 °F class per HAN-DH-0618.
- 0.430 in WATROD elements — tubular elements in D / LDH modular duct packages.
- ~40 W/in² class — watt density up to ~40 W/in² on 0.430 in elements.
- To 600 VAC class — supply and optional process thermostats/sensors by order option.
Typical applications
- HVAC and process duct air heating on non-pressurized systems.
- OEM air handlers specifying modular D/LDH duct heater packages.
- Retrofits matching airflow, kW, and duct flange dimensions.
Selection guide
- Duty — Non-pressurized air heating; process temperatures to 1200 °F class per HAN-DH-0618 duct heater sheet.
- Element — 0.430 in. WATROD tubular elements in LDH / D-series duct packages.
- Watt density — Up to ~40 W/in² on 0.430 in WATROD elements (per HAN-DH-0618).
- Supply — Up to 600 VAC class per duct heater specification sheet.
- Sensor / control options — Optional process thermostats / sensors per options.
- Mounting — Modular air duct heater packages for non-pressurized systems.
- Notes — Values aligned with Watlow HAN-DH-0618 duct heater specification sheet. Heater assembly — not a measuring instrument.
Common mistakes
- Specifying for pressurized vessels or liquid immersion — this family is listed for non-pressurized air duct packages.
- Confusing duct packages (this SKU) with bare WATROD tubular elements (see 21697).
- Leaving duct cross-section, airflow, and inlet/outlet temperature blank — lock thermal duty before RFQ.
- Assuming thermostats ship standard — process thermostats/sensors are optional per options list.
- Expecting a measuring accuracy line — this is a heater assembly.
- Heaters · Duct heater buying guide
When to RFQ / what to tell us
- Duct size, airflow, inlet/outlet temperature, and target kW / watt density (≤~40 W/in² on 0.430 in elements).
- Voltage (≤600 VAC class), thermostat/sensor options, and LDH / D-series preference if known.
- Quantity, ship-to, and any material/termination constraints.
Request a Quote · Get selection help
Specs
| Spec | Value |
|---|---|
| SKU | 21698 |
| Brand | Watlow |
| Model | WATROD Duct Heater |
| Product type | heater |
| Duty / temperature | Non-pressurized air heating; process temperatures to 1200 °F class per HAN-DH-0618 |
| Element type | 0.430 in. WATROD tubular elements in LDH / D-series duct packages |
| Watt density | Up to ~40 W/in² on 0.430 in WATROD elements (per HAN-DH-0618) |
| Supply voltage | Up to 600 VAC class per duct heater specification sheet |
| Sensor options | Optional process thermostats / sensors per options |
| Mounting | Modular air duct heater packages for non-pressurized systems |
| Notes | Values aligned with Watlow HAN-DH-0618. Heater assembly — not a measuring instrument. |
Documents
FAQ
Q: Pressurized or liquid service? A: This SKU covers non-pressurized air duct packages — not pressurized vessels or immersion.
Q: How does this differ from WATROD tubular (21697)? A: 21698 is a modular duct heater package using 0.430 in WATROD elements; 21697 is the bare tubular heater family for immersion/air with bend formations.
Q: What should I send for a quote? A: Duct size, airflow, temperatures, kW, voltage, thermostat need, quantity. Compatible with systems using Watlow WATROD duct heaters — we do not claim authorized-dealer status.
Links
| Parameter | Value |
|---|---|
| Measuring range | Non-pressurized air heating; process temperatures to 1200 °F class per HAN-DH-0618 duct heater sheet |
| Accuracy | N/A (heater assembly) |
| Output | N/A (heating assembly; optional thermostats for control) |
| Supply | Up to 600 VAC class per duct heater specification sheet |
| Ambient temperature | Per Watlow duct heater application limits |
| Mounting | Modular air duct heater packages for non-pressurized systems |
| Sensor type | Optional process thermostats / sensors per options |
| Notes | WATROD-based duct heaters (D / LDH series family). Specs from Watlow HAN-DH-0618 duct heater specification sheet. |
| Watt Density | Up to ~40 W/in² on 0.430 in WATROD elements (per HAN-DH-0618) |
| Element Type | 0.430 in. WATROD tubular elements in LDH / D-series duct packages |