Mark III Hot Water Coil Temp Output

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snuffy
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Posts: 532
Joined: Fri. Jan. 25, 2008 11:55 pm
Hand Fed Coal Stove: Harman SF250 & Mark III backup
Other Heating: Oil Hot Water

Post by snuffy » Tue. Mar. 17, 2009 11:33 pm

Hi,

Is anyone using their Mark III or other 90L BTU hand stove for alternative use hot/warm water? I would be interested to about learn your experience using such a system i.e. works well, wouldn't do it again, water leaks etc. Thanks for your advice.

Snuffy

 
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WNY
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Location: Cuba, NY
Hot Air Coal Stoker Stove: Keystoker 90K, Leisure Line Hyfire I
Coal Size/Type: Rice
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Post by WNY » Wed. Mar. 18, 2009 7:47 am

Do a search on HOT WATER COILS on here, many are using them.


 
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pine grove coal user
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Posts: 129
Joined: Tue. Feb. 24, 2009 8:50 pm
Location: Pine Grove, Schuylkill County, Pennsylvania
Hand Fed Coal Boiler: H. S. Tarm, model 202, 1980
Hand Fed Coal Stove: Reading 'bucket a day' stove in storage, waiting for attention
Coal Size/Type: Pea, from Little Buck mine
Other Heating: New Yorker oil burner which almost never runs, thanks to the Tarm!

Post by pine grove coal user » Thu. Mar. 19, 2009 8:11 pm

I have the Harman hot water coil installed in my Harman Mark II stove. I followed the Harman installation instructions and have had no problems and no leaks for four years now.
I plumbed it in to the hot water jacket of the oil burner (not the domestic hot water coil). They coal stove and oil burner set beside each other so I did not install a circulating pump. The hot water moves from the coal stove to the oil burner by thermosiphon. It works very well. There are times the water in the oil burner hits 240 degrees. In the morning three of us take showers without the oil burner running. Only when the fourth begins his shower does the oil burner start.
When it is very cold, I open the stop-check valve on the radiator water and allow the hot water to flow through the pipes naturally to the second floor (the stove is in the basement). Even with the water flowing continiously to the second floor (and keeping my children toasty warm) the oil burner does not start. Of course, when I'm doing that the temperature in the oil burner is not more than 140 degrees. Even still, as long as it does not start, and my children are happy, I'm happy.
Overall I think it was well worth the investment and would do it again in a hearbeat!

The Harman hot water coil is nothing more than a piece of 3/4" stainless steel pipe bent in a 'U' with threads on the end to connect it to the piping. If I had known what it was, I would have made it myself.

 
snuffy
Member
Posts: 532
Joined: Fri. Jan. 25, 2008 11:55 pm
Hand Fed Coal Stove: Harman SF250 & Mark III backup
Other Heating: Oil Hot Water

Post by snuffy » Thu. Mar. 19, 2009 11:04 pm

Thanks for your insight Pine Grove coal. I'm planning on using my Mark III to heat a 2,500 gal hydrotherapy pool to nearly 90 degrees without kicking in the electric element heater. I don't want to overheat and stew myself. Thanks again for your helpful comments.
Snuffy

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