I have been running my Combustioneer for 2 months now and would highly recommend this unit for several reasons:
It is conveinent, load coal in the morning, remove clinkers at night
It is efficient, we have just gone through a long period (3-Weeks) of below zero temperatures and this little unit kept the house at 73d 24/7
Wil-Burt is awesome, I sent an e-mail to Wil-Burt asking what the size of allen wrench to use to adjust the timer and got this responce a few days latter
From: Wesman, (Dan) Daniel [mailto:DWesman@willburt.com]
Sent: Tuesday, February 27, 2007 3:56 PM
Subject: Combustioneer MKIV Furnace
As you may be aware, the MKIV stoker fired furnace was discontinued by Will-Burt approximately 16 years ago. Because we receive very few calls anymore concerning that unit, and also because none of the persons involved with the MKIV development still remain with Will-Burt, we had to conduct a fair amount of research in order to be able to answer your question. Following is what we found...
• The set screw used in the timer cam adjustment is the Will-Burt part number 1335. It is a # 6-32 X 3/16 long, socket cup set screw.
• The Allen wrench used with that item, and provided originally with the furnace, is Will-Burt part number 21666. That wrench is a "short arm" type, 1/16 hex.
The fact that a 1/16 wrench is too small for the set screw in your timer leads me to suspect that the internal hex of the set screw may have become rounded off. If it gets "stripped out" like that, the wrench will no longer be able to grip.
Thank you for your inquiry, Harry. We hope that the explanation above will be of assistance to you.
I am very impress that this company would still support their product to this degree 16 years later.