The Wacker Neuson Switch (185°F) is a genuine OEM temperature switch designed for the HI750 and HI900 series indirect-fired air heaters. Sourced directly from Wacker Neuson, this part carries the same specifications as the original component installed at the factory. Fitment covers a broad range of HI750 and HI900 configurations, including diesel, natural gas, LP, skid-mounted, and surge-brake variants. When your heater's temperature switch needs replacement, installing the correct OEM part keeps your heating system operating within its designed parameters.
Key Features
- Calibrated Trip Point: — Factory-set to open at 185°F, ensuring the heater shuts off at the correct threshold to protect the heat exchanger and internal components.
- Genuine OEM Component: — Supplied by Wacker Neuson, this switch matches the original electrical and thermal specifications of the unit it replaces — no guesswork on compatibility.
- Broad HI Series Fitment: — Compatible across diesel, natural gas, LP, skid-mounted, and surge-brake variants of the HI750 and HI900 indirect-fired air heater families.
- Direct-Swap Installation: — Designed to connect into the existing wiring harness and mounting position, making replacement straightforward during scheduled service or field repair.
- Safety-Critical Function: — A faulty or out-of-spec temperature switch can allow the heater to exceed safe operating temperatures, risking damage to the heat exchanger or creating a hazardous condition on the worksite.
A temperature switch is a safety and control device that monitors heat levels within the heater's combustion or exhaust path and cuts power to the burner circuit when a set temperature is reached. In indirect-fired air heaters like the HI750 and HI900, this switch acts as a high-limit protection device — if the unit overheats, it trips and shuts down the burner before damage can occur. When the switch fails or drifts out of calibration, the heater may shut down prematurely, fail to ignite, or — more critically — continue running past safe temperature limits, which can accelerate wear on the heat exchanger and pose a safety risk in enclosed work environments.
Part Details
| Part Number | 5000181859 |
|---|---|
| Old Part Number | 0181859 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Switch (185°F) |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI750 DGM HEATER-INDIRECT | HI750GM | 5000620859, 5000620930 |
| Mobile Indirect Fired Air Heat er, Diesel | HI750D | 5000620856, 5000620923, 5000620924 |
| HI 750GM HD-Mobile Indirect Ai r Heater-Surge, -40 | HI750GMHD | 5000620969 |
| HI750G HEATER-INDIRECT | HI750G | 5000620857, 5000620928, 5000620929 |
| HI900 Heater-DGM,Srg,-40 | HI900DGM | 5200014221, 5200014222, 5200014165, 5200014166 |
| HI 900D Heater-Indirect | HI900D | 5200014158, 5200014159, 5200014160 |
| Skid Indirect Air Heaters Natu ral Gas | HI900G | 5200014161 |
| HI 900G Heater-Indirect,3x16 | HI900 G | 5200014163, 5200014164 |
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.
