Coalpail.com Forum

Been searching the forum for quite some time and haven’t really found a concrete answer. I have a question regarding the horizontal length of chimney for a Harman magnum stoker. Where I want to position the stoker is about 12 feet away from an existing masonary chimney. Any advice on if this will work would be great. It will have a pretty good pitch as to where it will tie into chimney is about 8ft high. The existing chimney is 22 feet.

As discribed it will work, but, be forewarned, more horizontal pipe will gather more fly ash. So make pipe easy for inspections and accessable for cleaning out.. Tee's with a cap used where a 90 would've been.

Thank you for the reply. Is there any rule as to how much horizontal is permissible inside a home?

The longer the horizontal run, the higher the chimney should be. No formula that I know of but expect to clean it A LOT! 12' is a bunch for a 22' chimney. Is the chimney interior or exterior?

It is exterior

Why does it have to be so far away? Ductwork issue?

If I move it closer it will have to go in the separate furnace room. I’m looking to use the radiant heat for the finished basement and potentially duct the heat upstairs. Plus I would like to have the aesthetic look of the stove in the occupied area.

With such a long horizontal run I would suggest a manometer permanently installed to watch the draft as the temps change. You may find you need to run the stove 'hotter' during periods that have lots of idle time to keep the draft. That would just mean less time between timer runs or longer timer run times. You would burn a little more coal but knowing the draft would be fine would be worth it to me. This might only be necessary when temps are above a certain point. The manometer will help by giving the draft numbers during different burn conditions.

The fly ash will lay in that horizontal run and need to be cleaned. I would check the pipe after each ton of coal burned to see what the build up looked like and then plan to clean it accordingly. in addition to using a T instead of a 90, putting a T sideways in the middle of the 12' run so you can pop off the cap and take a look and also clean it through there may be a good idea.

Yes I notice with my other hand fed stove that if the temps are up during the day it does not burn as well I figured due to the draft. Where does one usually install the manometer? I like the idea of a sideways T I didn’t think of that one. Thank you for the reply.

Also can anyone post the dimensions of the magnum stoker ash pan. I need to have one made up and I can’t seem to find the size anywhere. I would rather get one made or make my own then spend 150+ on one from Harman dealer

The Magnum ash pan is 17.25" x 13.25" x 7.5" high... at least that is what mine measures.

I have about 12' of flue pipe on my boiler, with a few feet of rise from one end to the other. I clean the flyash out twice per year, and the boiler works well.

I have already taken my 4 feet of horizontal run off as the unit was running, dumped it into ash pan and put it right back in. One minute, tops. Not suggesting you do that but it worked for me when my airflow decreased.

That’s what I like to hear. Real world experience. I know every scenario is different and I “think” it will work in my case but that being said I’m not an expert on coal burning like the members here. So I just wanted to get some advice.

urhstry wrote: ↑

Mon. Oct. 01, 2018 1:47 pm

The Magnum ash pan is 17.25" x 13.25" x 7.5" high... at least that is what mine measures.

Thank you for the measurements