The Wacker Neuson Thermocouple is a genuine OEM component designed for the E-series ground heaters, hydronic surface heaters, and Pureheat hydronic heaters — including the E1100, E2200, E3000, E3000 ES, E5000, HSH350, HSH650, HSH700, S3000, HP252, CH5000, MC5200, and E700M families. As a direct OEM replacement, part is manufactured to the same specifications as the original and installs in the same location without modification. Broad fitment across diesel, gas, and electrically powered configurations makes this a smart stocking part for fleet operators and service technicians supporting multiple Wacker Neuson hydronic heating units.
Key Features
- Genuine OEM Temperature Sensing Accuracy — Manufactured to the original calibration spec so the burner control circuit receives the correct temperature signal, keeping combustion management precise across all supported heater configurations.
- Direct Drop-In Replacement — Matches the original connector type and probe dimensions for a straightforward swap on E-series ground heaters, HSH-series surface heaters, Pureheat units, and CH5000 cross heaters.
- Wide Model Coverage — Compatible with E1100, E2200, E3000, E3000 ES, E5000, HSH350, HSH650, HSH700, S3000, HP252, CH5000, MC5200, E700M, and Pureheat hydronic heater families — diesel, gas, and generator-equipped variants included.
- Protects the Burner System — A functioning thermocouple is the safety link between the pilot flame and the gas valve; a failed unit causes nuisance shutdowns or prevents ignition entirely, halting ground-thawing or surface-heating operations.
- Fuel System Safety Component — The thermocouple directly controls fuel valve operation; installing a correctly rated OEM unit ensures the valve closes as designed if the pilot flame is lost, preventing uncontrolled fuel release.
A thermocouple is a temperature-sensing probe that generates a small electrical voltage when its tip is heated by the pilot flame. In hydronic heaters and ground heaters, this voltage signals the gas valve to stay open, confirming that a live flame is present. When the thermocouple wears out or fails, it can no longer generate sufficient voltage, causing the gas valve to close and the heater to shut down — even when ignition conditions are otherwise normal. Replacing a faulty thermocouple restores reliable burner operation and ensures the heater's flame-failure safety circuit functions as intended.
Part Details
| Part Number | 5000166712 |
|---|---|
| Old Part Number | 0166712 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Thermocouple |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| E3000 Hydronic Surface Heater with generator | E3000 | 5000620219, 5000620679, 5000620158, 5000620678, 5200014677, 5200004952, 5100017807, 5100017809, 5200014678, 5200014679, 5200014720, 5100017806, 5100017808, 5200014721, 5100017810, 5100017811, 5100025046, 5100055568, 5100056441, 5100017801, 5100056440, 5100025045 |
| HSH700 | HSH700G | 5000620243 |
| E2200 GROUND HEATER, W/ LIFT BAIL | E2200 | 5000620215, 5000620176, 5000620216, 5000620226, 5100017448, 5100017449 |
| E5000 GROUND HEATER, W/GAS BURNER | E5000 | 5000620898, 5000620897, 5000620899 |
| Hydronic Surface Heater | HSH350 | 5000620254, 5200001677 |
| HP252 | HP252 | 5000620249 |
| Pureheat Hydronic Heater, Oil Burner | Pureheat | 5000620245, 5000620246, 5000620190, 5000620220 |
| E1100 GROUND HEATER | E1100 | 5000620172, 5000620244, 5200001676 |
| E3000 ES Hydronic Surface Heater | E3000ES | 5000620968, 5000620967 |
| Hydronic Surface Heater w/ Gen erator, 3000 ft hose | S3000 | 5000620218, 5000620182 |
| HSH650 | HSH650 | 5000620991 |
| Mobile Drying System | MC5200 | 5000620201, 5000620232 |
| Hydronic Surface Heater, 700m hose | E700M | 5000620195 |
| Cross Heater with oil burner | CH5000 | 5000620240, 5000620242 |
Verify Before You Order
Fitment is machine-number and revision-specific; always confirm your model and serial number against the fitment list.
Why Buy From DHS Equipment
Every part is verified against the manufacturer's part number before it ships, so what you order is what arrives. We carry parts from leading OEM brands and our own DHS Quality Parts line of professional aftermarket components. Need help finding the right part? Our team is available to confirm compatibility whenever you need it. Orders are processed fast to keep your jobs on track. We don't just sell parts. We keep you jobsite ready.
Questions? Contact our team at [email protected] or 866-611-9369 — DHS Equipment is here to help you maintain peak performance.
