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Stack height

Posted: Thu Feb 28, 2019 9:49 pm
by redleg105
I have a 15 year old WOOD DOCTOR boiler and want to know if extending the height of the stack will affect the performance of the unit.
It's a conventional boiler. I also want to change the top to a better type spark arrestor. Will that be OK.
Attached is s photo of the one I have.
fullsizeoutput_b89.jpeg (22.72 KiB) Viewed 77 times

Re: Stack height

Posted: Fri Mar 01, 2019 11:31 am
by RSI
Adding stack height will increase the draft draw so you will want to make sure the door seal is good so it doesn't overheat. If you are only going a few feet it probably won't make that much difference.
Do you have sparks coming out the chimney? The cap in the picture is designed to keep wind from blowing down the chimney and overheating the stove. If you have a lot of wind where the stove is then you might end up with an intermittent overheating problem that you didn't have before.
Also, spark arrestors get plugged pretty easily so it will add to the maintenance.

Re: Stack height

Posted: Sat Mar 02, 2019 8:17 am
by Bull
How long have you had your wood doctor?