Yes, ANOTHER OWB build thread... (Tank in tank style)

[breymeyerfam]

Sure didn't use the "hillbilly with a welder" design on the hinges - maybe that's why they were the most challenging part.

Yeah, the hinges are definitely overkill, but I want to be able to adjust the door fit over time. I want ZERO air leakage around the door.

 

[huntmaster86]

boiler looks great!!! wish you were making this last summer so i could of incorporated some of your design in my boiler.

 

[breymeyerfam]

Pressure test is a success. Has held steady over night.

 

[breymeyerfam]

For anyone wanting a better idea of how my design looks on the inside, I 3d modeled it and then did this cutaway view. This gives a good shot of how the flue and firebox are positioned within the water jacket.

 

[breymeyerfam]

The bottom of the door opening is 36" from the ground. That makes this thing very tall. Legs are 5x5x1/4 square tube I had laying around.

 

[NSMaple1]

Is there anything under the rear of the firebox for support? Or is all the weight hanging by the front face?

 

[breymeyerfam]

Is there anything under the rear of the firebox for support? Or is all the weight hanging by the front face?

Yes, I have spacers at the front and rear of the firebox so it can rest on the bottom of the water jacket. (This also helped me keep my positioning correct when I inserted the firebox and face to be welded into the big tank)

 

[NSMaple1]

Ok, cool.

That question just kind of popped into my head after some recent internet reading re. the old Wood Doctor debacle. The selling/marketing side, was placing blame for their failures or some of it at least, on the manufacturing side for short cutting & doing that exact thing. (Hanging the firebox off the front).

 

[breymeyerfam]

Door latch. Cam over bearing type.

Open:

Closed:

 

[absrio]

Ok, cool.

That question just kind of popped into my head after some recent internet reading re. the old Wood Doctor debacle. The selling/marketing side, was placing blame for their failures or some of it at least, on the manufacturing side for short cutting & doing that exact thing. (Hanging the firebox off the front).

along this same line of thought did the op place some spacers on the top of the burn chamber?? just think a hollow tank (basically) inside a tank of h2o will want to float.

 

[breymeyerfam]

along this same line of thought did the op place some spacers on the top of the burn chamber?? just think a hollow tank (basically) inside a tank of h2o will want to float.

No, other than the flue pipe welded up through both tanks.

 

[LondonNeil]

I'm enjoying reading this, keep up the great work!

 

[dave_dj1]

Very cool, I wish I had the time and money to build one exactly like it. Keep the updates coming. What size building(s) are you heating with it?

 

[breymeyerfam]

Very cool, I wish I had the time and money to build one exactly like it. Keep the updates coming. What size building(s) are you heating with it?

2500sf home and 34x48 shop

 

[dave_dj1]

Tell me your thoughts on this idea. It is related to circulation inside the unit. I was thinking if I built one I would have spiral fins on the outside of the firebox in hopes it would create some natural flow and to help more efficiently dissipating the heat transfer.

 

[breymeyerfam]

Tell me your thoughts on this idea. It is related to circulation inside the unit. I was thinking if I built one I would have spiral fins on the outside of the firebox in hopes it would create some natural flow and to help more efficiently dissipating the heat transfer.

Not sure. Test fired mine up to full operating temp (180°) today. With a pump circulating water, I feel that I have a good flow within the tank. From front to back, there was only a degree or two difference. From top to bottom there was maybe 4 or 5°.

 

[breymeyerfam]

FIRST FIRE AND TEST TO OPERATING TEMPERATURE IS A SUCCESS!
Pics:
Lighting first fire

Wood was kinda wet so little more smoke than I would like...

Flue temp about 12" above water jacket. 550-650 was the avg and the highest I saw was just over 700°. Mind you this was cherry, I'm sure oak or hickory will raise that.

Reached full temp!

After reaching temp, I used the hose and sprayed the tank to simulate a heat draw. Repeatedly would take 5 or 6 minutes of this to drop the water temp 5°.

Water was evaporating off the tank pretty quick at 180°!

 

[H-Ranch]

After reaching temp, I used the hose and sprayed the tank to simulate a heat draw.

Nicely done! Just in time to add a real heat draw and end the simulations.

 

[breymeyerfam]

Nicely done! Just in time to add a real heat draw and end the simulations.

10-4! Things I'm hoping to have done in the next 2 weeks:
1. Get insulation on tank. I already have quoted spray foam @ $400-$450 for 4" thick.
2. Lining up mini-excavator and concrete core machine for burying my pipe and coring through my basement wall and the floor of my shop.
3. Get concrete pad poured to set boiler on.

Final goal is to have this thing fired up and running by NOV 1.

 

[huntmaster86]

looking good!!! enjoying following your build