The Wacker Neuson Diaphragm is a genuine OEM component designed for the E 1250 and HSH 380 series hydronic surface heaters, including the E 1250S, E 1250P, E 1250B, HSH 380S, and HSH 380B models. As a factory-sourced part, the meets the exact material and dimensional specifications required for proper fluid pressure regulation within the heating system. Sourcing a genuine OEM diaphragm ensures the part seats and seals correctly without the need for any adjustment or modification to the surrounding assembly. Whether you are servicing a Standard, Premium, or Basic configuration, this part covers the full E 1250 range as well as both Natural Gas/Propane HSH 380 variants.
Key Features
- OEM-Grade Membrane Material — Manufactured to Wacker Neuson's exact material specification, ensuring correct flexibility, chemical resistance, and pressure response for hydronic heating applications.
- Drop-In Replacement — Engineered to the original dimensional profile, allowing direct installation into the existing diaphragm housing with no adaptation required.
- Broad E 1250 and HSH 380 Coverage — Confirmed fitment across the E 1250S, E 1250P, and E 1250B hydronic heaters, plus the HSH 380S and HSH 380B LP/Natural Gas models.
- Maintains Consistent Fluid Pressure — A correctly functioning diaphragm is critical to stable glycol circulation; a failed or stiffened diaphragm can cause erratic heat output or pump strain.
- Fuel-System Integrity — In hydronic heaters, diaphragm condition directly affects pressure regulation within the fuel and fluid circuits; using a genuine OEM part supports correct system operation and safe pressure management.
The diaphragm in a hydronic surface heater acts as a flexible pressure-regulating membrane within the fluid or fuel circuit, flexing in response to system pressure changes to maintain consistent flow and protect downstream components. When it degrades — through cracking, stiffening, or delamination — the system can lose pressure control, leading to uneven heat distribution, pump overload, or fuel delivery faults. Replacing a worn diaphragm with a correct OEM part restores the pressure balance the system depends on for steady, efficient operation.
Part Details
| Part Number | 5100014262 |
|---|---|
| Brand | Wacker Neuson |
| Part Type | Genuine OEM |
| Description | Diaphragm |
Compatibility & Fitment
| Name | Model | Machine Number |
|---|---|---|
| E 1250S Hydronic Heater, Standard, LP/NG | E1250S | 5200012354 |
| E 1250P Hydronic Heater, Premium, LP/NG | E1250P | 5200012356 |
| E 1250B Hydronic Heater, Basic, LP/NG | E1250B | 5200007613 |
| HSH 380S-Natural Gas/Propane, w/Generator | HSH380S | 5200012370 |
| HSH 380B-Natural Gas/Propane, w/o Generator | HSH380B | 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.
