With gas prices rising, it’s only a matter of time before the cost of petroleum home heat fuels follows suit. If you’ve been considering wood heat but didn’t know where to get started, here are a few basics you should consider
Wood Heating Basics –
Getting Started with Wood Heat for Your Home
You Must have an Ample Supply of Clean, Dry Wood
A wood lot can produce from 1 to 2 face cords of fire wood per acres a year. The best trees for harvesting fire wood include sugar and red maple, hickory, any of the oaks, beech, and hornbeam (ironwood). These are hardwood species that will give you the best return on your investment of labor by burning over a longer and producing a lot of heat.
I burn everything that dies in the woods at my house including elm, aspen and birch, but not much softwood such as pine. Softwoods burn quickly and produce less heat, meaning that you need to refuel frequently and use a lot more wood overall. (Note: Pine does make good kindling for a quick start to your fires.) For a detailed listing of the BTU content of various woods, visit Firewood resource.com.
Firewood should be “seasoned” or dried for at least six months to a year before you burn to reduce creosote in the chimney and air pollution. Green (unseasoned) wood will burn slowly and produce a lot of smoke and particulates. When these build up in your chimney, it increases the risk of a chimney fire. This means you should be planning for next winter now.
Plan for proper storage
To cure (dry), wood needs good air circulation. This means a shed without sides or rows with tarps. Personally, I’m not a fan of tarps or plastic because the wind and the sun will tear holes in them in short order, and water will leak in. You should also find something to stack the wood on to keep it off the ground. Old treated 4x4s are a favorite of mine. Above is a picture of my wood shed. You might recognize it from the post about natural back pain relief.
Heating with wood is labor intensive
One thing that most people don’t think about is how much time you will have to invest in cutting and splitting wood to heat your home. If you cut a cord or two of wood, split, and stack it, you will be doing a full day’s work. If you have back problems or other health problem you might want to consider buying your wood from a logger. There is also the task of keeping a fire. Most wood burners will require attention every 6 to 8 hours, maybe longer if you have a good furnace or outdoor boiler.
Wood stoves are not cheap
The initial cost of a wood furnace that will be about $3000 plus installation. Resale value drops quickly so if you don’t think you are in it for the long term any savings will be negated by the initial cost. (You *might* be able to get a deal on a used unit, but don’t count on it.) Quality wood cutting tools cost money, too, and with tools, you generally get what you pay for – it’s worth the extra money to get tools that last.
Pellet stoves may be a better choice for urban areas, because you don’t need to dry and store a year’s worth of fuel. Outdoor boilers are another option. You will loose some BTU’s because of the stove is outside the home, the water has to travel underground to the home and in the heat is transferred to the home via a heat exchanger. If you choose an outdoor boiler, radiant heating is preferable to a forced air system, which would reduce your efficiency even further.
There is additional risk involved in heating your home with wood
Make sure your home owner’s insurance will cover you if you have wood heat, and what restrictions they have on heating with wood. Clean your chimney every year and check for problems. Improper ventilation can lead to carbon monoxide build up, which can be deadly. (A carbon monoxide detector is a good investment for nearly every home, but especially those with combustion appliances.)
Creosote build up is another concern. Mastersweep.com explains:
What most people think of as “smoke” is better termed “flue gas.” This “smoke”, or flue gas is released by the initial fire: the “primary combustion.” Flue gas consists of steam, and vaporized but unburned carbon based by-products (vaporized creosote). As the flue gas exits the fireplace or wood stove, it drafts upward into the relatively cool flue where condensation occurs. Like hot breath on a cold mirror, the cool surface temperature of the flue causes the carbon particles in the warm vapor to solidify.
The actual cause of creosote condensation, is the surface temperature of the flue in which the flue gas comes in contact. This resulting carbon based condensation which materializes inside the flue is creosote. It’s usually black in appearance. It can be the fine black dust called soot, (1st stage creosote); or porous and crunchy, (2nd stage: see photo on left); or it can be tar-like: drippy and sticky, until it hardens into a shiny glaze, (3rd stage). All forms of creosote can occur in one chimney system. Whatever form it takes, creosote is highly combustible. If it builds up in sufficient quantities – and ignites inside the chimney flue: the result is a volcanic chimney fire.
Several conditions encourage the buildup of creosote:
- A flue too large for the wood burning appliance, (e.g.. unlined insert)
- A restricted air supply
- Unseasoned or rain-logged wood
- Cooler-than-normal surface flue temperatures, (e.g.. metal fireplace chimney)
Please note the phrase “volcanic chimney fire” – ‘nuf said – clean the chimney.
Chain saws and other wood cutting tools are dangerous. Anything strong and sharp enough to take down a tree can also go right through you. The chain saw is a tool the demands the utmost respect – poor judgement can leave scars that last a lifetime. You should also invest in steel toed boots, logger’s chaps, safety glasses and a hard hat. Every year professional loggers are killed in the woods – it is definitely not something to do with the boys and a few beers.
I hope this post hasn’t scared you off of using wood heat. I’ve used it as my primary heat source for years, as have many friends and family members. It’s a good feeling to look out at a well-stocked woodpile and know that whatever happens to oil prices, your home will be warm without breaking the bank.