Hello there, I have a Harman SF-260, first year burning with it, overall I'm fairly happy with it. I'm just experimenting with it trying to get longer burn times and have a few questions after reading a thread from about a year ago. This boiler has grates primarily used for burning coal, I'm burning exclusively wood in this boiler, in another thread I have read that someone with this unit experimented with putting fire bricks over the grates and used the manual turn knobs to control the air to the firebox, just wondering how this would work out? Essentially running it as a wood stove. Currently using the automatic draft to regulate the fire the boiler seems to get up to temperature very quickly almost over-firing the unit, then shuts down and smolders wasting wood. So I'm wondering if a slower burn using the manual turn knobs would produce a longer burn, keeping the temperature between 150F-180F. Thanks for your time. Andrew.