air scoop vs eliminator vs separator

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Old 02-26-13, 01:01 PM
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air scoop vs eliminator vs separator

Looking at this page at pex supply site Air Eliminators , Taco Air Scoops , Spirovent Air Eliminator - PexSupply.com it appears that there are multiple choices when it comes to extracting air from the hydronic system. Ranging from less then $20 and to well above $1000.

What is the criteria (besides price) that one should choose one or another for a residential heating systems? Do they all do the same thing? Is one more preferable than other? It seems that all of these do the same thing under $100:

Taco Air Scoops
Spirotherm Air Eliminators
Vortech Air Separator
4900 Series Air Separators
EAS Jr Air Separators
PV SuperVent Air Eliminators
Microbubble Air Separators
 
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Old 02-26-13, 03:21 PM
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While air scoops and air separators all do the same thing, remove air, there are differences with the implementation of each.
A basic air scoop requires laminar flow in order for the air to rise into the scoop portion of the unit.
This is accomplished by a min. 18" length of straight pipe before the scoop.
With out such, it's no more than a expansion tank tee.
Taco vortex is pretty good, based on trying to set up a bit of a vortex and causing the air to stick to the screen in the chamber before it collects enough air to rise to the surface.
Spiro, Caleffi, Honeywell all make good products. The concept of each is much the same, they basically want to give air something to stick to on it's way thru the device.
If your system has a higher flow rate, you might upsize your eliminator as they take advantage to a pressure reduction as the fluid moves into a larger chamber. If the flow is too great the units are not as affective in my experience.
 
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Old 02-26-13, 04:32 PM
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If the flow is too great the units are not as affective in my experience.
This would probably hold true for ANY of them... including the cast iron 'scoops'. The reason that they are larger diameter is because this will cause the flow to slow down as the water passes through, giving the air time to 'float' up to the top, or get stuck to the screen or 'brush' inside the devices.

In a well designed system, they will probably all do an adequate job, even the el-cheapo cast iron ones.

Remember too... once the air is out, it's OUT! or, shall I say that it SHOULD be.

If there are no leaks, no non-O[SUP]2[/SUP] barrier PEX, pressure is maintained properly, expansion tank maintained properly, then ANY of these devices will really only have anything at all to do for perhaps a month or two after initially filling a system with water.

At least in theory...
 
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Old 02-27-13, 01:16 PM
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ok, that makes sense. the cheap ones require special conditions to work properly, the other ones are more forgiving and the choice comes to individual preference. i will go thru a smaller subset of the eliminators to choose from and review them one by one.

thanks!
 
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