Choosing the right separator can improve circulation, reduce noise, and help protect pumps, valves, and emitters from trapped air and magnetic debris.
Below, we break down five strong options so you can match the right size and connection style to your hydronic setup.
Best 5 Magnetic Air Separators for Hydronic Systems Picks for 2026
Brass Coalescing Separator
- Captures micro bubbles and static air
- Reduces noise and improves operation
- No regular maintenance required
Best For: Hydronic systems needing a durable, low-maintenance air separator
Magnetic Combo Separator
- Combines air elimination and dirt separation
- Magnets improve ferrous particle capture
- Works in horizontal or vertical pipes
Best For: Systems needing threaded combo air, dirt, and magnetic separation
Press-Fit Magnetic Separator
- Press-fit combo air and dirt separator
- Magnets help capture ferrous particles
- Fits horizontal and vertical pipe runs
Best For: Press-fit hydronic systems needing combined air and dirt separation
Hydronic Air & Dirt Control
1" Spirocombi Magnet (Threaded)
- Combines coalescing air elimination with dirt separation.
- Magnets increase ferrous particle separation efficiency.
- Universal connection supports horizontal or vertical piping.
Best For: Systems needing combined air and magnetic dirt separation in 1-inch threaded size.
Magnetic Separator Upgrade
1-1/4" Spirocombi Magnet (Threaded)
- Coalescing air eliminator plus dirt separator in one unit.
- Magnets improve ferrous particle separation efficiency.
- Universal connection supports horizontal or vertical piping.
Best For: Larger hydronic piping that needs combined air removal and magnetic debris capture.
Brass Coalescing Separator – Webstone 3/4 in Air Separator
Webstone Brass Air Separator, w/Removable Vent Head & Coalescing Medium, CxC, H-74003, 3/4 in
Check Price On AmazonFor hydronic systems where trapped air is causing noise, wear, or reduced efficiency, this Webstone brass air separator is built to capture micro bubbles and static air with a coalescing medium. Its design is practical for installations that need flexible flow direction and low-maintenance operation.
Best For: Hydronic installs that need a durable brass separator for removing air and reducing system noise.
Pros:
- Stainless steel coalescing medium captures micro bubbles and static air
- Helps reduce noise and improve system efficiency and operation
- Pin-guided float is designed for jam-free operation and less wear
- Can direct flow into either side of the unit and requires no regular maintenance
Cons:
- Available size here is 3/4 in, so it may not fit larger systems
- Designed as an air separator only, not a combined air-and-dirt unit
Overall, this is a straightforward choice for buyers who want a brass magnetic air separators for hydronic systems style solution focused on air removal and long-term reliability. It stands out most where low maintenance and flexible installation matter.
Magnetic Combo Separator – Spirocombi 1-1/2 in Threaded
This Spirocombi is a strong option in magnetic air separators for hydronic systems when you need both air elimination and dirt separation in one threaded unit. The built-in magnets surround the flow path to improve ferrous particle capture, while the coalescing design targets free, entrained, and dissolved air.
Best For: Hydronic systems that need combined air elimination, dirt separation, and magnetic particle capture.
Pros:
- Combines air elimination and dirt separation in one unit
- Powerful magnets increase separation efficiency of ferrous particles
- Removes 100% of free air and entrained air, plus up to 99.6% of dissolved air
- Universal connection supports horizontal and vertical pipe installation
Cons:
- Threaded version may not match systems that require press or sweat connections
- At 1-1/2 in, it may be larger than needed for smaller hydronic runs
This model is a practical pick if you want one component to handle air, dirt, and magnetic separation together. It is especially useful where protecting pumps, valves, boilers, and heat exchangers is a priority.
Press-Fit Magnetic Separator – Spirocombi 1-1/2 in Press
For installers who prefer press connections, this Spirocombi is a useful entry in magnetic air separators for hydronic systems with combined air elimination and dirt separation. It uses the same high-efficiency coalescing and magnetic design, but in a press-fit configuration for compatible piping.
Best For: Hydronic systems that need a press-fit combination separator for air, dirt, and ferrous particles.
Pros:
- High-efficiency combination air eliminator and dirt separator
- Magnets around the flow path improve ferrous particle separation
- Removes free air, entrained air, and up to 99.6% of dissolved air
- Universal connection supports horizontal and vertical pipe installation
Cons:
- Press connection limits it to systems designed for press-fit installation
- 1-1/2 in size may be more capacity than some smaller systems need
This version makes sense when your piping system is already set up for press fittings and you want the same air, dirt, and magnetic capture benefits. It is a solid match for protecting key hydronic components from debris and trapped air.
Hydronic Air & Dirt Control – 1" Spirocombi Magnet (Threaded)
The 1″ Spirocombi Air & Dirt Separator Magnet is a practical choice for magnetic air separators for hydronic systems when you want air removal and ferrous particle capture in one threaded component. It combines a coalescing air eliminator with a dirt separator, and the surrounding magnets help increase separation efficiency for metal debris in the flow path.
Best For: Hydronic systems that need combined air elimination and magnetic dirt separation in a 1-inch threaded format.
Pros:
- Combines air elimination with dirt separation in one unit.
- Powerful magnets surround the flow path to improve ferrous particle capture.
- Universal connection supports horizontal or vertical piping.
- Made for hydronic systems and aims to protect pumps, valves, boilers, and heat exchangers.
Cons:
- Threaded version is size-specific at 1 inch.
- Best suited to systems where magnetic separation is needed.
- May be more than a basic air-only eliminator if you don’t need dirt capture.
This model stands out as a combined solution for air and debris control, especially where ferrous particles are a concern. If your system benefits from a single device that addresses both air and dirt, it is a strong fit.
Magnetic Separator Upgrade – 1-1/4" Spirocombi Magnet (Threaded)
The 1-1/4″ Spirocombi Air & Dirt Separator Magnet is a straightforward option among magnetic air separators for hydronic systems when you need combined air elimination and ferrous debris handling in a larger threaded size. It works as a coalescing air eliminator and dirt separator, while magnets around the flow path are designed to improve ferrous particle separation efficiency.
Best For: Hydronic piping that needs a 1-1/4-inch threaded separator for both air removal and magnetic dirt capture.
Pros:
- Combines air eliminator and dirt separator functions.
- Magnets around the flow path help increase ferrous particle separation.
- Supports horizontal and vertical pipe installation.
- Available in a threaded 1-1/4-inch configuration for hydronic systems.
Cons:
- Only one size is represented here: 1-1/4 inch threaded.
- Designed for systems that specifically need magnetic separation.
- Not a dedicated air-only component.
For larger threaded hydronic runs, this model offers the same combined air and dirt management approach in a 1-1/4-inch size. It is a sensible pick when you want one unit to help reduce air and ferrous debris in the system.
How We Picked the Best Magnetic Air Separators for Hydronic Systems
We focused on Magnetic Air Separators for Hydronic Systems that offer practical installation options, proven air and dirt removal, and strong compatibility with common residential and light commercial loops. Priority went to models with magnetic capture for ferrous debris, service-friendly designs, and sizes that match typical pipe runs.
Quick Comparison
The lineup covers both air-only and combined air-and-dirt separation, with threaded and press connection choices. The 3/4-inch brass unit suits smaller connections or targeted retrofits, while the 1-inch, 1-1/4-inch, and 1-1/2-inch Spirocombi models fit progressively higher-flow applications. If your priority is simplified installation, the press version can save labor where compatible fittings are already in use.
Key Buying Factors for Magnetic Air Separators for Hydronic Systems
Connection Type and Pipe Size
Match the separator to the actual system piping before anything else. Threaded models are flexible for service access, while press versions are attractive on jobs where speed and consistent fit matter. Size affects pressure drop and performance, so avoid undersizing on higher-flow systems.
Air, Dirt, and Magnet Performance
Some systems need only air removal, while others benefit from combined air and dirt separation. In systems with cast-iron components, older piping, or recurring sludge, a magnetic separator can help capture fine ferrous particles that standard vents may miss.
Serviceability
Look for features that make maintenance easy, such as removable vent heads, accessible cleanout areas, and straightforward flushing. A separator that is easy to inspect is more likely to stay effective over time.
Installation Space and Orientation
Check clearances around the boiler, manifold, or primary loop. Compact brass units can fit tighter spots, while larger combi separators may be better placed where there is room for proper piping and future servicing.
Who Should Buy Which Magnetic Air Separators for Hydronic Systems?
If you are upgrading a small or simple loop, the 3/4-inch brass separator is a sensible compact choice. For systems that need stronger dirt capture and magnetic protection, the Spirocombi options are better suited, especially on equipment with recurring air, sludge, or pump wear concerns. Choose the 1-inch or 1-1/4-inch threaded versions for moderate systems, the 1-1/2-inch threaded model for larger flow demands, and the 1-1/2-inch press version when your installation is built around press-connect labor savings.
In short, the best pick is the one that fits your piping, service strategy, and contamination level—not just the one with the biggest nameplate size.
