Hot Water From Wood Stove...

[hr3]

I'm looking at adding a hot water coil to my woodstove.. I'v been searching the net but can only find coils that go in the firebox.. I would like to have one that bolts to the side ???

Has anyone seen one or have one that they can tell me about..??? Thanks..

 

[dave1949]

If you google 'water jacket' you will get a bunch of hits.

Never had one. The people at hearth.com have some info too. They are generally against the idea of interior firebox water jackets. Wood cookstoves have bolt on jackets as options, that would be another area to look in.
Dave.

 

[MikeD74T]

Buy a 25' roll of 1/2 od copper tubing & with a bending spring make a coil that has a slightly larger ID than your stovepipe OD. Put the coil on the vertical section of the stovepipe & pipe to inlet& outlet of your hotwater heater. It will circulate by gravity & keep you tank full of hot water. Don't put any valves in the line unless you also put in a relief valve between the valves.
Another method is to drill holes in the stove just below the top & pass black iron pipe thru the holes & connect with elbows on the outside. Plumb as above. 3-5 passes thru the stove is plenty.

Keep in mind that both methods provide heat continuously while there's a fire in the stove. Lifting the hw heater relief valve is common so it must be routed to a safe place. MikeD74T

 

[schmism]

Buy a 25' roll of 1/2 od copper tubing

soder it to plate of 1/4" copper and set it on top of the stove and make your plumbing connections.

 

[MikeD74T]

soder it to plate of 1/4" copper and set it on top of the stove and make your plumbing connections.

I don't recommend soldered connections for woodstove applications as an overheat condition due to water loss may result in the system self destructing. Although adding the plate will enhance heat transfer, there's usually too much heat transfer anyway. MikeD74T

 

[SPYDERLK]

I'm looking at adding a hot water coil to my woodstove.. I'v been searching the net but can only find coils that go in the firebox.. I would like to have one that bolts to the side ???

Has anyone seen one or have one that they can tell me about..??? Thanks..

Are you going to be pumping water thru the coil or thermal siphon? I am going to be working this problem too for transferring heat to the radiant floor in my shop, presently under construction. I favor the copper tubing ideas on the outside. I have concerns also to provide benign failure if power/pump goes out while the stove is crankin. Its going to be a while before I really get to this. It is cold NOW, but other shop appointment tasks are even more important. Lets start with wiring....
larry

 

[ultrarunner]

My neighbor bought her Oakland CA home in 1922. She had a combination gas/wood Wedgwood with copper coils transferring heat to a raised riveted 15 gallon water tank.

The tank ws vented through the roof and always open to atmosphere...

She would open a faucet to fill the tank using a sight glass level and then watch a temperature gauge to know when it was hot enough to fill the bath tub... she would temper the hot water with cold water.

She used the set-up through the 80's and then had a gas heater installed when the riveted tank sprung a leak... all the hardware and stove was still in place when the house was sold in 2005... the new owner ripped it all out, did a quick remodel and flipped the home...

The homes in the subdivision were sold without heaters... most installed $35 Montgomery Wards Floor Furnaces... her house 1100 square foot home had only the Wedgewood for Heat...

 

[schmism]

I don't recommend soldered connections for woodstove applications as an overheat condition due to water loss may result in the system self destructing. Although adding the plate will enhance heat transfer, there's usually too much heat transfer anyway. MikeD74T

ok then braze it. if you run into problems from overheating that (a surface temp in excess of 840F), the plumbing isnt going to be what your going to worry about.)

 

[hr3]

Spy,, Yes I will be pumping the water through the "water jacket".. I have a 80 gal "extrol tank" with a coil in it,, I'll have all the safety devices needed if the power goes out,, I have an "Englander" add on wood furnace that Is over heating the house on warm days,,"anything above 0 .. and want to capture more heat out of the wood I'm useing,,

Mike,, I'd rather not put anything inside the stove or stovepipe,, I'm already running a lower stack temp. than I should,, Sooo I think the outside jacket type would be best,, But I can't find one yet,,,

Dave,, I,v been searching the term "water jacket" like you said,, but still no luck finding one yet..

 

[dave1949]

Dave,, I,v been searching the term "water jacket" like you said,, but still no luck finding one yet..

I looked in some detail this am, not the gold mine I thought it was - sorry.
Check this site for some good and bad ideas:

Heating water with a wood stove

People have made what you are looking for, darn hard to find useful pics. They are out there somewhere.
Dave.