The Wacker Neuson Spring is a genuine OEM component designed for the E1250 and HSH380 series hydronic surface heaters. This includes E1250S, E1250B, and E1250P models across Standard, Basic, and Premium configurations, as well as HSH380S and HSH380B units in both LP/NG and Diesel variants — with or without an integrated generator. As a direct OEM replacement, the is manufactured to the same specification as the original part, ensuring a correct, drop-in fit with no guesswork at installation. Keep this spring on hand to restore proper function quickly when servicing any of these hydronic heater models.
Key Features
- Genuine OEM Tension and Geometry — Manufactured to the exact spring rate and dimensional spec of the original, ensuring correct mechanical response within the heater assembly.
- Broad HSH and E-Series Coverage — A single part number covers E1250S, E1250B, and E1250P hydronic heaters as well as HSH380S and HSH380B models across fuel types and generator configurations.
- Direct Drop-In Replacement — Engineered to seat and function identically to the factory spring, with no modification to surrounding components required at installation.
- Restores Correct Mechanical Action — A fatigued or broken spring can prevent valves, actuators, or control linkages from returning to their proper rest position, compromising heater operation and output consistency.
- Sourced from Wacker Neuson — Supplied as a genuine OEM part, backed by Wacker Neuson's parts program for confidence in quality and long-term availability.
A spring in a hydronic surface heater typically serves as a return or tensioning element within a valve, actuator, or mechanical control linkage. It holds components under the correct pre-load or returns them to a defined position after actuation, allowing the heater's fluid or fuel circuits to open and close as intended. When a spring loses its tension, deforms, or breaks, the affected component may stick open or closed, leading to irregular heating output, fuel delivery issues, or a complete loss of heater function — making timely replacement essential for reliable cold-weather operations.
Part Details
| Part Number | 5200021048 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Spring |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| E1250S | E1250S | 5200012355, 5200012354 |
| E12540B | E1250B | 5200012353, 5200007613 |
| HSH380s | HSH 380S | 5100054643 |
| E 1250P Hydronic Heater, Premium, Diesel | E1250P | 5200012357, 5200012356 |
| HSH380S-Diesel, with Generator | HSH380S | 5200012371, 5200012370 |
| HSH380B-Diesel, without generator | HSH380B | 5200012359, 5200007614 |
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.
