Will this work on 3 knob Harmon pp38+ ?

Describe 3 knob? If you mean 1 knob for feed, 1 knob temp, 1 knob for air flow speed, yes it will. Just plug ESP sensor plug into one you take out. After you install new, make sure stove is unpluged from electrical source until completed.

What is the length of the wire I will ned this for my pb105 Boiler i need it to be about 8 feet in length of black wire.

It's probably 2 feet. Maybe 3 at most. It's just 2 wires. U could probably splice wires in and just add the length u need

Anyone know of this fits the Harman absolute 63?

I’m not sure about the harman 63. I have a harman that is from 1996. The reason I changed the probe was because my stove would run for approximately 1 hour then shut down. I changed the probe and my stove has not had a problem since. There is videos on Utube or google the year model and make of your stove. Good lunch hope it works out for you.

ASIN	B07HJGD53B
Brand	Pellethead
Brand Name	Pellethead
Customer Reviews	4.4 out of 5 stars 133 Reviews
Manufacturer	Pellethead
Measurement Accuracy	±2.0%
Measuring Range	100 - 300 °C
Model Number	3-20-11744
Mounting Type	probe mount
Output Type	electrical signal
Sensing Distance	6.35 Centimetres
UPC	652174647279 810004060524
Upper Temperature Rating	300 Degrees Celsius

Harman Heatilator Black ESP Thermistor Probe 3-20-11744

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