Glenn, if you make a call to an old friend, you'll get the 'rest of the story'. You will have an inside track then.
Evolution from the old AA design was where it started, but just for that type of boiler. Growing pains as mentioned by Steam-up, cost time and money. Like outdoor boilers, live and learn. I've seen 15 of these (outdoor boilers) in my little town of 2800 folks since last Sept. I've only gagged a few dozen times from the acrid smoke........they keep stuffin' the wood right to em'. Most have used 10 cords or more. That's a lot of sticks, even if they were 'free'.!
Is your Eshland an indirect blower or the direct mount? Ashing timer or thermocouple? The older models replaced all the gear mechanisms with a simple timer usually set to run 2 minutes for every 10 minutes that the fan ran. Auger fed or a hopper model? Most auger fed models used a bindicator(tm) to control coal level in the smaller hopper. As far as I know, they were bulletproof. Anyone with an Esland/AHS is probably not doing much to it, they are a simple, rugged and hands-off unit.
The 130 is like the story of "The Little Train That Could". The 260 is a take no prisoners model. It makes some real heat, for not much coal usage. The 500 is not for the faint of heart! Big Toys for BIG Boys!
Send me a PM if you have one available, I have a friend looking right now. He burns propane (@2.58/gallon) and used 1120 gals so far this winter heating 1610 sq ft. at 66 degrees. I don't go nuts with my house, 70 is very comfortable, 66 at night.
He shivers and is now listening when I mention the uniform heat and quiet operation of the boilers.