Have collected some materials and am getting ready to start building an owb. The water jacket is going to be a 300 gallon tank, 38"x60", the firebox is a 4' piece of 26" pipe 3/8" thick. I am going to run a 8" flue pipe out the back and put four 3"schedule 40 pipes through the top of the firebox for heat transfer. I plan on heating my 2200 square foot house and also a 20'x35' garage. Any suggestions or advise I may need to know?
In would be hesitant on PVC..... Copper or at the least cast iron Sent from my SM-N910V using Tapatalk
Don't think that would last very long! lol I may actually use square tubing for this, depends on what I have laying around.
I'd sure like to see a build series when you get started on it. I already have a small OWB at my home, but I scored a 250 gal lp tank ( out of service ) for free that I have been thinking about building a OWB for an off grid cabin.....
I plan on posting a build, all I have done so far is the firebox, I found several pinholes in the 300 gallon fuel tank so I have to spend some money now. Am going to have a sheet of 3/16 steel bent in a box shape, 30" on top and bottom and 41" sides. This should give me around 220gallons of water( if I fill it to top) and can still have everything put together for around 800$. Sounds like a good score on propane tank!
I'm planning on building an OWB pool heater later this winter for my parents swimming pool. Already,got the materials gathered up, just have to commit the time. It'll have stainless pipes, stainless intake and outlet boxes, and a brick lined firebox.
That would work out good, I am debating on lining firebox with brick to try to keep a hotter more efficient fire, not sure if I will or not yet
Do you plan on using a plate exchanger or running domestic water thru the jacket? Also, I'm not in agreement with running tubes thru the firebox- placing any "heat sink" within the combustion area will rob the fire in that box by sucking the heat you know will be part of an efficient burn.... post combustion, or at least "behind" the main fire box would be better, I think. Just my opinion tho, as I have zero experience with an OWB. Either way, I can't wait to see the build thread Merry Christmas Dmorris
Merry Christmas! I changed my mind about tubes in too of firebox, think it would take up too much space. Plan on using a plate type or side arm exchanger for hot water, got a new welder for Christmas so after I get the metal bent I will really get started.
These are some rough plans I have come up with for my boiler. With the materials I will have around $800 in getting the boiler put together. Any suggestions or thoughts would be greatly appreciated.
Finally got my metal bent and picked up, welded supports across bottom of water jacket to hold firebox pipe, water jacket is 3/16" steel, hopefully I can make some progress on this thing in the next couple of weeks.
Here is some more pics, got supports under fire box, and cut front plate for water jacket and fit in place hopefully tomorrow I can get front plate welded, and rear plate so water jacket will be done, changed my mind, not going to buy a manufactured door yet, gonna try to build one with a natural draft ran from an aqua stat,if that does not work I am making door frame size so I can buy a door if I am not happy with the one I build, any suggestions on how deep I should put my stack in firebox? I am coming in centered from top with 8" pipe, thought about putting it fairly deep in firebox to make somewhat of a baffle, any ideas???
Been too busy to do much lately, finally got a 8" stainless flue pipe welded in and put a baffle in top of firebox to hopefully slow down some of the heat from going out the stack, hopefully tomorrow can make front weld to firebox and fill with water to leak check, while that is sitting with water I plan on starting door and frame, changed my mind and plan on building a door with a natural air intake, but still leaving the option for a forced air blower if I am not happy with performance.
Filled with water today to check for leaks, just a few small leaks on bottom of water jacket, firebox is still dry so I am happy!
really interesting and informative Dmorris ... I wish I were smart enough to offer hints and advice.. sadly that is not the case... are you planing on lining firebox with fire brick?