Had to write about a recent experience regarding poor performance of my e2300 gasser and a nearly plugged chimney.  Long-story short, MAKE SURE to CHECK your CHIMNEY for built up creosote and fly-ash.  Sounds like an obvious thing to do, but I did not check it for 4 years! I had not checked that part of my boiler since first using it back in2009-2010 heating season, but did just last weekend after having some very frustrating times to get it to maintain heat in not too cold of weather.  After listening to my story on the phone, my dealer told me to make sure and check that ALL parts of the boiler are clear.  I said sure, I'll check them all. Well, the one that I had not checked previously, the chimney, really had a LOT of crap in it.  So, a neighbor and I took down the 2 sections and I rammed a fence post thru it many times to loosen all the crud. Got it totally cleaned and re-installed.  Also, at the same time I installed a new gasket, so that may have helped as well.  Now, the e2300 is back to it's normal good performance and it is a HUGE relief.  I just never thought the chimney would/could get that plugged up and cause such terrible performance.  So, I wanted to post this, in case other folks over time experience decreased performance with their gasser style boilers, so they may not go thru the misery that I did by not doing ALL the recommended maintenance.  I have attached a picture looking downward into the plugged chimney BEFORE I took it down and cleaned it out.
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