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NOTE: ESES offers information, services, parts, and accessories to all consumers. Regarding stove sales, we are limited to Wisconsin and Michigan territories only. If you live outside these areas, you will need to contact the manufacturer to find your nearest local stove dealer.
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Genuine OEM replacement Harman and Heatilator Eco-Choice vacuum differential switch, part number 3-20-6866. The replacement vacuum differential switch is used in all Harman pellet stove models, the Harman Mark I coal stove model, and Heatilator Eco-Choice boiler and furnace models including the BA100, BH105, BH60, and BIO-120.
Also referred to as the negative pressure switch or low draft switch, the vacuum differential switch senses air pressure in the firebox and exhaust flue vent pipe. The vacuum switch is in-line with the auger feed motor and will not allow the auger motor to run if it is tripped or faulty. Any air losses or air blockages can trip the vacuum switch. When experiencing issues with this safety switch, check the following: vacuum switch hose/tubing, firebox door and ash door gasket seals, ash accumulation in the stove or venting, air intake channel, combustion blower/exhaust fan functionality. Check out our video below to learn more about the pressure switch.
OEM Vacuum Pressure Differential Switch
Guaranteed Newest Stock Inventory
1 Year Manufacturer Warranty
Why Choose Pellethead?
On-Time Shipping
USA Retail Locations
Unmatched Warranty – No Hassles
Live Tech Support
We have over a 99.5% on-time shipment rate. Get your products on-time or before the estimated delivery date.
We are not fly by night online Retailers that will be here today and gone tomorrow.
We stand behind every product we sell with our no hassle warranty.
We offer tech support for every single product we sell. Have an issue, have a question? No problem give us a ring.
Genuine OEM replacement Harman and Heatilator Eco-Choice vacuum differential switch, part number 3-20-6866. The replacement vacuum differential switch is used in all Harman pellet stove models, the Harman Mark I coal stove model, and Heatilator Eco-Choice boiler and furnace models including the BA100, BH105, BH60, and BIO-120.
Also referred to as the negative pressure switch or low draft switch, the vacuum differential switch senses air pressure in the firebox and exhaust flue vent pipe. The vacuum switch is in-line with the auger feed motor and will not allow the auger motor to run if it is tripped or faulty. Any air losses or air blockages can trip the vacuum switch. When experiencing issues with this safety switch, check the following: vacuum switch hose/tubing, firebox door and ash door gasket seals, ash accumulation in the stove or venting, air intake channel, combustion blower/exhaust fan functionality. Check out our video below to learn more about the pressure switch.
OEM Vacuum Pressure Differential Switch
Guaranteed Newest Stock Inventory
1 Year Manufacturer Warranty
Why Choose Pellethead?
On-Time Shipping
USA Retail Locations
Unmatched Warranty – No Hassles
Live Tech Support
We have over a 99.5% on-time shipment rate. Get your products on-time or before the estimated delivery date.
We are not fly by night online Retailers that will be here today and gone tomorrow.
We stand behind every product we sell with our no hassle warranty.
We offer tech support for every single product we sell. Have an issue, have a question? No problem give us a ring.
We have been in business 30 years, we are pellet stove specialists. Period.
We service our customers stoves, and provide you with the same quality parts.
Check out the only ash vacuum made by pellet stove professionals in a corded and cordless option.
Want to cook pizza in 3 minutes? Check out the Pellethead Smokin Po Boy.
Specs
Included
Vacuum Switch Sensor Only. Please see our related listings for the replacement hose.
Function
This Vacuum Sensor Pressure Switch detects pressure in the exhaust chamber and vent piping as well as the firebox and fuel hopper. This switch will shut down the auger feed motor if the exhaust is blocked, exhaust fan is weak, ash blockage in the unit or venting, gasket seals are not tight around the door, ash pan or fuel hopper lid.
Models
Harman Pellet
Absolute 43
Absolute 63
Accentra 52I
Accentra 52i-TC
Accentra FS (Accentra Cast)
Accentra Insert
Advance
Allure 50
HydroFlex 60 (HF60) Boiler
P35I Insert
P38 (P38+, PP38+)
P43
P61
P61A
P68
PB105 Boiler
PC45
PF100 Furnace
PF120 Furnace
XXV (25th Anniversary Model)
XXV-TC
Harman Wood & Coal
Mark I
Heatilator Pellet
BA100
BH105
BH60
BIO-120
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Returns accepted within 30 days on products not used or installed
Over 30 years of trusted value and commitment to customers.