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[DaveWertz]

No it will not hurt it not using fire brick.

[wissel12]

I went to my local feed mill today and bought some coal. I got 180 lbs to try out. It seems to be burning good. I put really dry oak down first and then the coal. It sells for 180 a ton. I took a picture, but the up loader is full. I'll try later.

[walkerdogman85]

I am impressed with coal. I gave some to a friend of mine who also has a hardy and just after one night he wants to go buy some bigger stuff. It has cut my wood usage more than 50% in the last 3 days at temps 0 and below at night! My job is based off of coal so I'm going to heat off coal....

[wissel12]

I'm with your friend. I'm going to buy half a ton on Friday. I think with the natural draft, It will only burn when real cold out side. I set my differential to 4. I tighten it up to keep the coal hot.

[walkerdogman85]

I'm not sure how to set my differential or I would do it. Coal does need alot of air.

[wissel12]

Here is a link for  honeywell aquastat. http://s3.supplyhouse.com/manuals/1350890933994/83991_PROD_FILE.pdf

When you take the cover off the aquastat. You will see a white dial. That is your differential. It should go between 5 and 25. It is on page 9 shows the white wheel. The big wheel in the front is your setting for your high limit.

I hope this helps.

[walkerdogman85]

Thanks, I saw the high point setting as i turned it i realized thats what it was as the fan was coming on and off as I adjusted it. Ill study the the link you sent me and set it closer. Thanks alot for the info

[AirForcePOL]

I would recommend just buying a Ranco aquastat and replacing your Honeywell. 

[MD20/20]

I like my Ranco a lot better than the old Honeywell aqua-stat- I can easily read the settings.

[walkerdogman85]

I have heard that before about the Ranco, what makes it better than the Honeywell? I haven't had any issues with it in the 3 years I have had it.

[walkerdogman85]

What would you guys set the differential at?

[Vincent Paul]

hey wissel12, we also have a Ridgewood 7500, let me know how the coal works out.  I have a coal mine 7 miles from our farm which sells lump coal for $80/ton..................Vincent Paul

[MD20/20]

I like the digital display. It allows me to set it exactly where I want it (which is not always where it should be!).

[walkerdogman85]

I looked at the aquastat and there was no differential wheel in the back. Looks like I'll be buying a different one for next winter, although since burning coal on these below 0 days the hardy is running often..

[AirForcePOL]

Yea there's a few different models that Honeywell sells.  The one I had on my hardy was not adjustable and permanently set to a 10 deg differential.  Get on ebay, they sell ranco controllers for $43