I've worked on thousands and thousands of oil burners. I've seen several
smoke pipes installed down hill and I once saw one over 40 ft. (pitched
properly), and they worked fine. There are a few things you need to be
1) Make sure the chimney flue liner is sized properly. Do not oversize it. 8
x 8 covers most Weil-McLain residential boilers.
2) Make sure the chimney is high enough above the peak of the house, and not
obstructed by trees.
3) Make sure the smoke pipe goes up hill. 1/4" per ft. is good. If the
boiler is convertible from a top flue to rear flue, put the smoke pipe off
the top if you have enough pitch. If not, put it off the back. The pitch is
the more important of the two.
4) Do not 'bull-head' the draft regulator.
The 25 ft. vertical chimney is going to help (not hinder) the draft, as long
as the chimney is warm and dry, you should be ok.
Thousands and Thousands? Do the math. I dont think so.
40ft horizontal Im assuming? Id like to see that one.
Quite a bold, blank, rule of thumb statement that can quickly get you
High enough? Whats that mean?
Obstructed by trees????
Smoke pipe? You mean the flue pipe? Most new residential oil burners
burn at a "0" or "trace" smoke which would be impossible to see smoke
coming out of the flue pipe so you could hardly call it a smoke pipe.
Draft regulator? Would you by chance be talking about the barometric
............and without holes or...............trees. :-)
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