MPD Location

Modern and vintage hand fired coal stove are similar to a wood stove and in some cases can burn either. They need to be regulated and fed by hand usually every 12 to 24 hours depending on your usage. They require no power to operate making them ideal for rural settings with long power outages.
ddahlgren
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Post Sun. Mar. 09, 2014 3:06 pm

I in no way dispute their need and usefulness but a question on location. Everything I have read mentions something like between 12 and 18 inches from the stove outlet. Why not 5 feet and gain a lot of heat exchanger area?

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Lightning
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Post Sun. Mar. 09, 2014 3:07 pm

I agree, why not?
Be careful its not a fire hazard.
Is the pipe much cooler after a MPD?
I agree it would be after a barometric..
Last edited by Lightning on Sun. Mar. 09, 2014 3:09 pm, edited 1 time in total.

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freetown fred
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Post Sun. Mar. 09, 2014 3:08 pm

That'll work just fine also if you're comfortable with it--no safety issues involved there, just preference :)
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ddahlgren
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Post Sun. Mar. 09, 2014 3:54 pm

My reasoning is based on the fact a base burner has a longer flue path as one of it's benefits why not think along the same lines and while can not add as much you can add some to recover more heat. It is what we are trying to do heat a space.

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freetown fred
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Post Sun. Mar. 09, 2014 4:02 pm

Do it--if it works well, your reasoning is correct, if it don't work well, your reasoning was a tad off ;)
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ddahlgren
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Post Sun. Mar. 09, 2014 4:29 pm

freetown fred wrote:Do it--if it works well, your reasoning is correct, if it don't work well, your reasoning was a tad off ;)
I am doing the install this spring hopefully in time to try a burn before next heating season so I can fix it if need be before I need it. Maybe install two one close and one farther away so I can test which works best?

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freetown fred
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Post Sun. Mar. 09, 2014 5:22 pm

Sounds like a winner all round. Personally, I don't think you'll find any difference, but make sure you post your results.
"A people that values it's privileges above it's principals, soon loses both"--Dwight D Eisenhower

Sunny Boy
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Post Sun. Mar. 09, 2014 6:44 pm

ddahlgren wrote:My reasoning is based on the fact a base burner has a longer flue path as one of it's benefits why not think along the same lines and while can not add as much you can add some to recover more heat. It is what we are trying to do heat a space.
Sound reason and it works. Even my kitchen range with it's long indirect flue paths, and more heat radiating surface area then a base heater, doesn't have any problem with the MPD 3 feet from the stove.

To gain heat radiating area, I put the MPD up as high as possible. It's 36 inches above the range pipe collar. And there is a substantial heat difference below and above the MPD when it's close to, or fully closed.

I would have put the MPD even higher, but then , like Fred mentioned - safety. My girl friend couldn't reach it safely if it was any higher. If it was, she might accidentally lean on the hottest end of the stove top.

Paul
So many stoves - so few chimneys. I must be coal-stone crazy.

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michaelanthony
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Post Sun. Mar. 09, 2014 7:28 pm

As long as you get the desired flue pipe temp. warm enough to keep the necessary draft the mpd placement is secondary, remember there are no free btu's.
never yell through a screen...you'll strain your voice.

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scalabro
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Post Sun. Mar. 09, 2014 8:06 pm

I wonder if any rocket scientists have tried a MPD at the flue outlet on top of the chimney?

:doh:

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freetown fred
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Post Sun. Mar. 09, 2014 8:16 pm

Alright--where the hell is Larry???????????????????????????
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dlj
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Post Sun. Mar. 09, 2014 8:24 pm

I don't think it makes much difference. I think the main concern is ease of use. You should have it where you can reach it easily while attending your stove. I like it handy to the valve on my base burner. So mine is about 8 inches from the valve on my stove. I can work both easily.

dj

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Lightning
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Post Sun. Mar. 09, 2014 8:51 pm

Gekko wrote:I wonder if any rocket scientists have tried a MPD at the flue outlet on top of the chimney?

:doh:
Seems like I remember someone blocking part of the top of the chimney purposely to reduce the opening size because the draft was too strong.. Hmmm who was that?...

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scalabro
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Location: Southwick Massachusetts

Post Sun. Mar. 09, 2014 8:54 pm

Lightning wrote:
Gekko wrote:I wonder if any rocket scientists have tried a MPD at the flue outlet on top of the chimney?

:doh:
Seems like I remember someone blocking part of the top of the chimney purposely to reduce the opening size because the draft was too strong.. Hmmm who was that?...
???

KingCoal
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Location: Elkhart county, IN.

Post Sun. Mar. 09, 2014 9:48 pm

i did both, I took off the cap and registered the result AND put a reducer on top and logged that result also.

i did not however use an MPD up there as that would have meant multiple trips up across the roof to check at 22.5 * intervals.
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