Brlyeeanze MH18B Pilot Assembly: Can This Part Fix Your Mr. Heater Big Buddy in 2026?
This $19.99 pilot assembly restores your Mr. Heater propane unit to full working order. It covers four part numbers and includes ODS safety shutoff.
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Our Verdict
This pilot assembly replaces a failed ignition part inside your Mr. Heater propane unit. It fits the MH9B, MH9BX, and MH18B models.
The built-in ODS sensor cuts off gas when oxygen levels drop. That protection matters when you run propane in enclosed spaces.
At $19.99, this part costs far less than replacing an entire heater. Your MH18B puts out 18,000 BTU once the assembly is working again.
This part suits garage and workshop use best. Propane heaters fit better in vented or semi-outdoor spaces than in bedrooms or offices.
What We Like
- Fits MH9B, MH9BX, MH18B, and compatible Dewalt propane heaters with one part.
- ODS sensor shuts the heater off when oxygen in the room drops too low.
- Replaces four part numbers: 78422, F278527, F273401, and 73404.
- Costs only $19.99 to restore a heater that outputs up to 18,000 BTU.
- Manufacturer offers direct contact before purchase to confirm your heater fits.
What Could Be Better
- Propane use only. This part does not work with natural gas or any other fuel.
- No tip-over protection is included in this pilot assembly.
- No thermostat function. You cannot set or control temperature with this part alone.
- No oscillation or airflow control. Heat distribution depends entirely on the host heater.
- Limited brand compatibility. This part does not fit all propane heater brands or models.
Standout Features
Full Specifications
Additional Info
| Assembly | No |
Frequently Asked Questions
Common questions about 78422/F278527 Pilot Assembly ODS Compitable with Mr.Heater Big Buddy Heater MH18B MH9B MH9BX or Dewalt Small Propane Heater Parts 78422,F278527
Which heater models does this pilot assembly fit?
It fits Mr. Heater models MH9B, MH9BX, and MH18B. It also works with compatible Dewalt small propane heaters.
Can I use this part with a natural gas heater?
No. This pilot assembly is designed for propane only. Do not use it with natural gas or any other fuel.
What part numbers does this replace?
It replaces part numbers 78422, F278527, F273401, and 73404.
Does this pilot assembly include an ODS sensor?
Yes. The ODS (Oxygen Depletion Sensor) shuts your heater off automatically when room oxygen levels fall too low.
How do I know if this part fits my heater before I buy?
Check your heater's model number against the listed models. If you are still unsure, the manufacturer recommends contacting them directly before purchasing.
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How this product scores for different use cases
Scores
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