I'm thinking it wouldn't, but could someone verify? Also nothing special for a chimney - right out the side of the house. Might save install cost anyway.
Velvetfoot, have a PB105 and as you all know it has an output of about 110,000 btu/hr on max output. Some days here in northern NY the demand from the boiler, including DWH, might exceed that number. My solution, and I don't really know if it will work as designed, was to install an indirect Smart 100 that the PB heats and use it as a buffer tank and a DHW source. My oil boiler backup also feeds the same buffer tank and can do so simultaneously with the pellet boiler to give me the opportunity to put over 240,000 btu/h to the buffer which supplies the heat demand and the DHW. I exchange the heat in the tank for the heat demand with a flat plate exchanger and a stainless Grundfos pump. The last winter wasn't really cold enough to "test" this design of mine, but I'm certain that time will come in the near future. Summary, in logical hypothesis, a fair sized buffer should be an advantage, and with a small footprint, over a hydronic system without one.The idea of a buffer tank to smooth out the short cycling is appealing.
No to additional storage on a PB-105. I added an old unused water heater into my boiler loop for additional storage thinking that it would help with the pellet consumption, but it actually takes more with the additional storage. The reason that it doesn't work is that the PB-105 will shut down after the ESP probe reaches a certain temperature. Every time the boiler cycles off in the automatic mode, the boiler will cool down some until the unit shuts itself down. This is because the combustion / exhaust fan runs until the unit cycles off and draws heat out of the unit and out the exhaust until the ESP probe senses that the unit is cool enough. The more storage that is circulating through the boiler, the more heat that is lost out the exhaust and the longer it takes the boiler to shutdown.
Call for heat ends, circulator turns off, boilers goes into cool down, over heats, turns dump circulator on, dumps into storage, return keeps boiler warm, and it extends cool down? Lame.
At what temperature does the dump turn on / off?
Just want to know how it works.
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