Description
The Maid O’Mist Model 78 Auto-Vent is a reliable automatic air vent engineered to eliminate trapped air from hydronic heating and steam distribution systems. Unwanted air pockets are one of the leading causes of reduced heat transfer, noisy pipes, and inefficient system operation — the Model 78 addresses this problem automatically, without the need for manual bleeding.
How It Works
The Model 78 uses a float-operated mechanism that continuously monitors the presence of air within the system. When air accumulates, the vent opens to release it; once water fills the chamber, the float rises and seals the vent closed. This automatic cycle keeps the system free of air locks and running at peak performance.
Key Features
- Automatic float-operated air venting — no manual intervention required
- Designed for hydronic hot water and steam heating systems
- Compact, durable construction for long service life
- Helps eliminate pipe noise, cold spots, and heat loss caused by trapped air
- Easy installation on radiators, baseboards, and distribution piping
- Trusted Maid O’Mist quality — a recognized name in hydronic system components
Applications
- Residential and light commercial hydronic heating systems
- Hot water baseboard and radiator systems
- Steam heating distribution lines
- Boiler system air elimination points
Why Choose the Maid O’Mist Model 78?
Maid O’Mist has been a trusted manufacturer of hydronic and steam system components for decades. The Model 78 Auto-Vent reflects that heritage with straightforward, dependable performance. By keeping air continuously purged from the system, it helps maintain consistent water flow, even heat distribution, and extended equipment life — making it an essential component for any properly maintained hydronic system.
Reviews
There are no reviews yet.