Replacement Digital Temperature Controller for Classic model outdoor furnaces only (after serial number 25151). DOES NOT include Temperature Sensing Wire (p/n 727) Former part number is 4221.
P/N 8320 is used for E-Classic 2300 Wood Only models.
For furnaces with serial numbers between 13428 - 25150 please use part numbers 1497 and 1496.
For furnaces with serial numbers up to 13427, please use part number 1999
Posted by Unknown on 4th Feb 2014
Wes at Myheatingoptions.com was incredibly knowledgeable of what I needed. He made sure that I received everything that I needed. I will be doing business with him in the future if I need anything for my Central Boiler.
Posted by Chuck Saye on 25th Nov 2013
It was a perfect replacement for a defective original controller in my 2004 Classic 4436. Works great.