Making a DIY wood burner

What non motorbike related things are you doing, making, building, planning or designing
ace llani
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Making a DIY wood burner

Post by ace llani »

Making a wood burner for the workshop.

I've used a 47 kilo propane bottle.

Made sure it was empty of gas, then unscrewed the valve from the top. Filled it with water to expel any trace of gas - remember propane and butane are heavier than air so will sit in the bottom.

Cut a slit vertically with a 1mm disc cutter disc.Attached the hinges across this as to make sure the door will nice and square when its all cut.
Then cut the rest of the door out. Nice tight fitting door :thumbup:

the threaded lug where the valve was, is drilled off with a circle of small holes around the outside leaving a hole for the flue.

Temporary catch made for the door to keep it closed.

Lit up with some wood (outside) which burned off most of the orange paint - will now need a wire wheel in the angle grinder to clean it properly.

Heat it gave off was great, plan is to install it inside the workshop, and probably make it also heat an old radiator, by winding 8 or 10mm copper tube around the base of the flue to heat the water. Will need to be vented for expansion.

It's a low / no cost job, and my sticking point now is the flue pipe.
Proper vitreous enamel stuff is expensive (fifty quid a metre) and my workshop is two storey so that's a no go.

So - anybody done similar, or have any ideas for a flue?

Also need to keep the neighbours happy so not sure how high the flue needs to be, and how high off the roof.

Pics to follow when I figure out my new PC - to get the photo's off my phone..
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Horse
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Re: Making a DIY wood burner

Post by Horse »

You don't have to believe everything you think
David
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Re: Making a DIY wood burner

Post by David »

ace llani wrote: Sat Oct 17, 2020 12:23 pm Making a wood burner for the workshop.

I've used a 47 kilo propane bottle.

Made sure it was empty of gas, then unscrewed the valve from the top. Filled it with water to expel any trace of gas - remember propane and butane are heavier than air so will sit in the bottom.

Cut a slit vertically with a 1mm disc cutter disc.Attached the hinges across this as to make sure the door will nice and square when its all cut.
Then cut the rest of the door out. Nice tight fitting door :thumbup:

the threaded lug where the valve was, is drilled off with a circle of small holes around the outside leaving a hole for the flue.

Temporary catch made for the door to keep it closed.

Lit up with some wood (outside) which burned off most of the orange paint - will now need a wire wheel in the angle grinder to clean it properly.

Heat it gave off was great, plan is to install it inside the workshop, and probably make it also heat an old radiator, by winding 8 or 10mm copper tube around the base of the flue to heat the water. Will need to be vented for expansion.

It's a low / no cost job, and my sticking point now is the flue pipe.
Proper vitreous enamel stuff is expensive (fifty quid a metre) and my workshop is two storey so that's a no go.

So - anybody done similar, or have any ideas for a flue?

Also need to keep the neighbours happy so not sure how high the flue needs to be, and how high off the roof.

Pics to follow when I figure out my new PC - to get the photo's off my phone..
I bought 8feet of 4" welded pipe from the local (to Aberystwyth) smithy, about £30.
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DefTrap
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Re: Making a DIY wood burner

Post by DefTrap »

There's loads of specific guidance online for flues but the main thing (that makes it actually perform properly) is getting it high enough with respect to the nearest roof apex. Without that the downdraft often cocks the draw right up depending on wind direction. Yeah guess how I know. ;)
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Re: Making a DIY wood burner

Post by demographic »

A mate and I made a gas bottle wood burning stove years ago.
I'll have some pics but likely on an old memory card.
Was a fairly decent setup but the bottle was turned on its side with steel girder along the bottom to catch the ash using a removable metal tray and another section of girder on the top that the smoke ran through and that acted as a hotplate.
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MingtheMerciless
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Re: Making a DIY wood burner

Post by MingtheMerciless »

Section J of the building regs for flue clearances/heights Etc, it’s actually reasonable easy to read as well
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ace llani
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Re: Making a DIY wood burner

Post by ace llani »

I'll look up the height off the roof stuff shortly.

In terms of an inexpensive flue (if there is one) - can you use the flexible flue liner on its own?
Got a decent section skip-diving at the tip :roll:
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Re: Making a DIY wood burner

Post by Big Pete »

I've got spiral wound ventilation ducting on two of mine, seems to be holding up pretty well. I sealed the joints with fire cement and ally tape. I used ducting express out of Leicester, but there's likely somewhere closer to you. I used 6 inch, with a couple of T pieces so it can be cleaned, it draws well, and copes fine with the heat. You need 600mm above the nearest roofline IIRC. You'll find your stove efficiency improves no end if you put an internal baffle in place so the exhaust path is longer, and if you can be arsed, secondary air injection works pretty well. I built one out of a SS beer barrel, with the above features, and I have to have a fan blowing over it or it glows red. matt black HT paint obviously helps a lot as well.