OK get your minds out of the gutter - my problem is I cannot get the boiler temp up past 160* no matter what I try. After 2 weeks of my first fire I'm about to throw in the towel. hopefully someone here has an idea, as I'm about to go back to my old system and wife is running the oil furnace. Here's the run-down: I bought a used EKO 40. Prior owner used it for 2 seasons and removed, as he said he thought it used too much wood. I should have turned and run right there but figured I was smarter ( wrong ). He was not using return temp protection or storage, so I attributed his bad experience to that. After finishing all my piping and fixing it's controller ( bad cap ) I first fired it about 2 weeks ago. My system has a Taco mix valve on the return set at 140*, a grundfos 15-58 on the return line set to launch at 150*, 1.25" piping hooked to my in-floor system in my new shop. Flue ( 8" Metalbestos stainless dual wall ) goes immediately thru wall, and then up roughly 22'. The return mix valve is verified to be working as I'm seeing 140+ with my IR gun at the fittings down there. My 2000 gal of storage is not installed yet. Primary air is set at 9mm, secondary at 3.5 turns out, fan shutter usually about 1/2" to 3/4" open ( though I always fiddle with it trying to get something good to happen. I've verified the primary air passes into the wood box, and secondary comes out the 4 holes thru the side of the nozzle. Turbs go up and down with the lever, though the sides of the 6 tubes still look filthy after you cycle it ( the Polocks that make these must only feel the need to remove the big chunks? ). The boiler will only maintain gassification for about 1/2 hour to an hour max. It continually diminishes until it gets to the point there is only hot air carrying a few glowing embers thru the bottom of the nozzle. If I open up the top door and stir up the wood, and let it roar a bit ( it will carry flames thru the bypass and about 3' down my flue ) then close bypass and restart fan, it will gas good for a short bit, then peter out. I cannot get the boiler temp above 155 to save my soul. Even with no circs to my floor running ( just heating the boiler and roughly 50' of black pipe ). The hottest I can get it is running it with the bypass open, soon as I close the bypass and it's gassifying ( sort of ) the temps start to drop. I put a probe in the flue immediately behind the boiler and it reads 600+ in bypass, upper 400's on the rare occasion it's gassing ( but water temps only hold steady or drop ), and high 200's when smoldering thru the nozzle. lower chamber has black sooty deposits, upper is literally dripping with creosote. The wood I initially was running was admittedly too large, and was at an average of 20%. I've switched to a small stack of oak I had indoors at 5 - 8% split real small and not much improvement. Borrowed a wheelbarrow full of 10% maple and ash from neighbor and still no luck. I can keep it gassing, but would need to move a cot to the shed to babysit the thing. I'm wondering about deposits on the heat transfer surfaces, but that has no connection to it's inability to maintain gassing. I don't think I have a draft problem, but perhaps its too much - I can have the blower fan running, open the bypass, and open the top door and get very little smoke in the room - it all is being sucked out the back. Anyone run into problems like this and is there a solution short of scrapping it, calling it a $4k leaning experience and moving on?