circulation pump set to Push or pull

[slackdaddy1]

Heated slab, Electric mini boiler, 2- 300' 1/2 pex loops.
is it best to set up the mechanicals to have the pump "pull" the water out of the floor and push into the boiler?
Or to "pull" out of the boiler and "push" into the floor loops?

Thanks,
Slack

 

[Jackfre]

"Pump Away" By Dan Holohan. Pump away from the boiler and put your expansion tank on the suction side.

 

[yeldogt]

Pump away ... after the fill/expansion/air eliminator .. and any 3/4 way valve.

 

[Bretny]

They dont **** for a darn. Cant really even make suction. Not that your closed system would need that. There usualy on the hot side

 

[Bondo]

Ayuh,.... Ole school was pump Into the boiler,....

New school is to pump Away from the boiler, with the air strainer/ pressure tank, 'tween the pump, 'n boiler,...

The low pressure point just before the pump causes the free air to leave the water at the air strainer,....