Description
The Mr. Heater 21925 is a genuine OEM replacement thermocouple designed specifically for MHHS125 series LP (propane) and NG (natural gas) heaters. Thermocouples are a critical safety component in gas heating appliances — they sense the presence of a pilot flame and signal the gas valve to remain open, shutting off gas flow automatically if the pilot goes out. Replacing a worn or failed thermocouple restores reliable pilot operation and keeps your heater running safely and efficiently.
Key Features
- OEM replacement thermocouple for Mr. Heater MHHS125 LP and NG heater models
- 13-inch lead length for proper reach and routing within the heater assembly
- Compatible with both LP (propane) and natural gas (NG) configurations
- Restores pilot safety shutoff function for reliable, code-compliant operation
- Direct factory replacement — no modifications required
- Manufactured by Enerco, the parent company and OEM behind Mr. Heater products
Application
- Designed for use with Mr. Heater MHHS125 series LP/NG heaters
- Suitable for residential, commercial, and industrial heating applications
- Ideal for service technicians and DIY replacement of faulty thermocouples
Why Replace Your Thermocouple?
A failing thermocouple is one of the most common causes of pilot outage issues in gas heaters. Symptoms include a pilot that won’t stay lit, nuisance shutoffs, or a heater that fails to ignite. Replacing the thermocouple with a genuine OEM part like the Mr. Heater 21925 ensures proper fit, function, and safety compliance — restoring your heater to peak performance quickly and affordably.
