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Funny Little Loops

Rob_7
Rob_7 Member Posts: 12
in THE MAIN WALL
On some of these Weil-Mclean boilers, the return pipe goes into the top of the boiler, make a loop or two, and comes out a few inches lower to feed into the suction side of the circ. pump. (Which then pumps into the bottom of the boiler.) Does anybody know why they do that?
Thanks.

Comments

  • Glenn Harrison
    Glenn Harrison Member Posts: 405
    That's a secondary condensing heat exchanger.

    It help remove a little extra heat from the flue gasses and preheats the cold return water before it enters the cast iron HX. It's the difference betwen an HE (high efficiency) model and a VHE (very high efficency) model. It also rates a little higher efficency percentage, although the exact numbers I don't know.
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