The Wacker Neuson Thermostat is a genuine OEM thermostat designed for the HI and HDR series indirect and direct-fired heaters, including the HI110HD D, HI110D, HDR155, HDR45, HD50, and HI35. As a factory-sourced component, the is built to the exact specifications required by these heating units, ensuring accurate temperature regulation from the moment it is installed. This thermostat is a direct-fit replacement, compatible across multiple Wacker Neuson heater models so you can source one part to cover a wide range of your fleet.
Key Features
- Accurate Temperature Sensing: — Genuine OEM construction ensures the thermostat opens and closes at the precise calibrated setpoint these heaters require — no drift, no guesswork.
- Direct-Fit Replacement: — Engineered to match the original mounting configuration and connection points, allowing a straightforward swap with no modification to existing hardware.
- Broad Heater Compatibility: — Fits the HI110HD D, HI110D, HDR155, HDR45, HD50, and HI35 heater models, making it a versatile stocking part for mixed-fleet operations.
- Sustained Heat Output: — A correctly functioning thermostat keeps combustion and airflow cycles on schedule; a failed unit can cause overheating, short-cycling, or a complete shutdown of the heating system.
- Fuel System Safety Relevance: — In combustion-based heaters, proper thermostat operation is essential to preventing runaway heat conditions — using the correct OEM-rated component matters for safe, code-compliant operation.
A thermostat in an indirect or direct-fired heater monitors the internal temperature of the heat exchanger or combustion chamber and signals the burner or airflow controls to cycle on or off to maintain a set operating range. When it is working correctly, the heater delivers steady, consistent warmth without overheating or wasting fuel. When a thermostat fails — whether it sticks open or closed — the heater may run continuously, fail to reach temperature, or shut down on a fault code, leaving a job site without the heat it needs during cold-weather concrete curing, thawing, or enclosed-space warming operations.
Part Details
| Part Number | 5000186821 |
|---|---|
| Old Part Number | 0186821 |
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Thermostat |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| HI 110HD D Indirect Air Heater, Diesel | HI110HD D | 5000620864 |
| HI 110D, HEATER-INDIRECT, DIESEL, -20° | HI110D | 5000620915 |
| HDR 155 Direct Fired Radiant Heater | HDR155 | 5200007530 |
| HDR 45 | HDR45 | 5200013800 |
| HD 50 | HD50 | 5200019335 |
| HI35 | HI35 | 5200019337 |
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.
