Harman and Heatilator Eco-Choice Differential Pressure Switch (3/20/6866)

Part number: 3/20/6866
Usually Ships in 1 to 2 Business Days
Part Type:
Thermodiscs & Switches
Warranty Period:
30 Days
Harman and Heatilator Eco-Choice Differential Pressure Switch (3/20/6866)

Replacement differential / pressure switch for Harman and Heatilator Eco Choice pellet stoves. Also, known as a vacuum switch. Click on the photo to enlarge and view other angles. Fits the following HHT pellet stove models:

Harman Pellet Stoves:

  • Accentra FS (Cast)
  • Accentra Insert
  • Accentra 52i
  • Advance
  • HF60
  • P35i Pellet Insert
  • Pellet Pro 38 Plus (P38+)
  • P43
  • P61
  • P61A
  • P68
  • PC45
  • PF100
  • PB105
  • XXV Pellet Stove

Heatilator Eco-Choice Pellet Stoves:

  • BH60
  • BH105
  • BA100

Harman part # 3-20-6866
Replaces Harman part number 3-20-9301 and 3-20-3433.
OEM Harman Part

This product has a 30 day warranty. The warranty is void if the part is installed in a unit the part was not designed for.


  • 5
    Harman and Heatilator Eco-Choice Differential Pres

    Posted by Deborah Staab on Mar 5th 2017


  • 5

    Posted by Patrick Connolly on Feb 14th 2017

    I did not think it would be the pressure switch, but I hooked it up quickly anyways to see and it was the issue! this part was in perfect condition and has my stove up and running again!

  • 5
    Switch for pellet stove

    Posted by craig swensen on Dec 7th 2016

    I received the proper replacement part for my stove with the exact same part#. Part worked excellent.

  • 5
    Exact same part

    Posted by Ed Milligan on Nov 20th 2016

    Same part as originally came on the stove. Works great

  • 5
    Harman and heatilator Eco choice differential pre

    Posted by Marion Scott on Nov 29th 2015

    My technician recommended this. Hasn't yet been installed yet.
    ***You need more space in the rifle subject line***

  • 5
    Pellet Stove

    Posted by Russell Becker on May 2nd 2015

    Had to call more than once, due to my problem,
    two young ladies were very pleasant and helpful.
    If I ever have a problem with my again, I will definite
    call your store. Thank you
    Russ Becker

  • 5
    Harman pressure switch

    Posted by Albert Battisti on Mar 28th 2015

    Great service! Received products promptly. Very friendly and helpful staff.

  • 4
    pressure switch

    Posted by Richard Yonge on Jan 7th 2015

    The service was excellent and delivery prompt. No opportunity to test the part yet.
    It was as if I was dealing with a firm down the road.

  • 5
    Technical help

    Posted by Fred Beebee on Mar 12th 2014

    I would like to thank Britney for the great troubleshooting assistance she provided to me. I tried the local Harman dealer here in central Oregon and basically got no help. They were willing to order what ever part that I wanted but could provide no technical assistance. Britney stepped me through some troubleshooting steps and we narrowed the problem down quicky to the pressure switch. Thank You!!