What Is the Difference Between Ash and Maple Wood? (Firewood BTU)
Seasoned white ash provides about 23.6 million BTU per cord. Maple varies by species: sugar maple is about 24 million, red maple about 20 million, and silver maple about 17 million BTU. So ash does not always outheat maple. These are estimates for seasoned wood, not a promise of the heat your stove will deliver.
If you are comparing a stack of ash with a stack of maple, the word “maple” can make the answer less clear than it first seems. It covers several species, and their heat values differ. Moisture matters, too: a cord of wet wood will not perform like a cord that has dried well.
I’ll compare the common reference figures, explain what changes the heat you get in practice, and show how to make a fair choice. The aim is a useful comparison, not a single number that hides important differences.
Ash vs. maple firewood BTU per cord
A British thermal unit, or BTU, measures heat energy. Firewood charts often report millions of BTU per cord, but the result depends on the species and the wood’s condition. The figures below are reference estimates for seasoned wood, not guaranteed heat from a particular stove or fireplace.
| Firewood type | Approximate heat per cord | What the figure means |
|---|---|---|
| White ash | 23.6 million BTU | A useful benchmark for ash |
| Sugar maple, also called hard maple | 24 million BTU | Similar to, or slightly above, white ash |
| Red maple | 20 million BTU | Lower than white ash in this comparison |
| Silver maple, often called soft maple | 17 million BTU | Lower than the other listed woods |
The comparison shows why a simple claim like “ash burns hotter than maple” can mislead. Sugar maple’s estimate is close to white ash and may be slightly higher. Red and silver maple have lower estimates in these reference figures.
Published firewood tables can give different numbers. They may use different sources, assumptions, or species labels. Treat the figures as a way to compare broad patterns, not as exact predictions for your next load.
What counts as a cord?
A standard cord is 128 cubic feet of stacked firewood, usually arranged in a stack measuring 4 feet high, 4 feet deep, and 8 feet long. That is the volume of the stack, not 128 cubic feet of solid wood.
The spaces between logs matter. Piece size, shape, and how neatly the wood is stacked affect how much solid wood fits into a cord. Two sellers may call their piles a cord, but a loose or short stack may contain less wood than a properly stacked standard cord.
Key takeaway: compare the same amount of properly stacked wood, and check which maple species you are buying.
Why ash and maple heat values differ
Ash and maple are groups of tree species, not single, identical fuels. “Ash” on a wood pile may refer to a species other than white ash, while “maple” can mean sugar, red, silver, or another type. A species name makes a BTU estimate more useful.
Wood density helps explain why species can differ in heat per cord. A cord of denser wood generally contains more wood matter in the same stacked volume. Still, the BTU figures above are estimates; species labels and the way wood is measured can vary.
With maple, the spread in the reference figures is large enough to affect a buying decision. Sugar maple is listed near white ash, while silver maple is several million BTU lower per cord. If the seller only says “maple,” ask which species it is before relying on a heat comparison.
I often see people focus on the tree name and overlook the condition of the wood. That can reverse the practical result: well-seasoned wood of one species may be a better choice than wetter wood with a higher reference BTU value.
Next step: identify the species if possible, then check whether the wood is dry enough to burn well.
Moisture changes the heat you can use
Moisture content is the amount of water in wood compared with its dry weight. Firewood comparisons commonly assume properly seasoned wood at about 20% moisture content or less. Wood with more water uses part of its heat to warm and drive off that moisture, leaving less useful heat for the room.
Wet or poorly seasoned wood can also produce more smoke and raise creosote risk in a chimney or flue. Creosote is a combustible deposit that can build up inside the venting system. The amount and risk depend on burning conditions and the appliance, so a BTU-per-cord estimate cannot tell you exactly what will happen in your home.
A moisture meter can help, but the reading should come from a freshly exposed split face, not just the outside of a log. The surface may dry sooner than the interior. Split a piece, then test the fresh face and follow the meter’s instructions.
| What you are comparing | Better basis for comparison | Why it matters |
|---|---|---|
| Ash vs. maple | Species plus moisture level | “Maple” covers a wide range of BTU estimates |
| One seller’s cord vs. another | A standard, stacked cord | Stack size and gaps affect the amount of wood |
| A dry load vs. a wet load | Moisture reading on a fresh split face | Wet wood gives less useful heat and can increase smoke |
| BTU estimate vs. stove heat | The appliance and how it is operated | Cord estimates do not equal delivered room heat |
Seasoning time is not one fixed number for every stack. It can vary with the wood’s starting condition, piece size, weather, and storage. Rather than trusting a calendar alone, check the wood itself and store it so air can move around the stack.
Key takeaway: compare moisture as carefully as species; a BTU chart assumes seasoned firewood.
Which wood is the better choice?
The better choice depends on which maple you have, how dry both options are, and how much wood you are buying. The table gives practical examples based on the reference estimates. It does not predict the exact heat from your appliance.
| Situation | What the estimates suggest | Practical choice |
|---|---|---|
| White ash vs. sugar maple, both seasoned | About 23.6 vs. 24 million BTU per cord | Treat them as close in heat value |
| White ash vs. red maple, both seasoned | About 23.6 vs. 20 million BTU per cord | Ash has the higher estimate |
| White ash vs. silver maple, both seasoned | About 23.6 vs. 17 million BTU per cord | Ash has the higher estimate |
| Ash is wet, maple is well seasoned | The dry maple may be more useful to burn | Choose based on measured condition, not the species name alone |
| Maple species is unknown | The estimate could vary widely | Ask the seller or compare by moisture and price |
Compare price by heat, not just by cord
If two options cost different amounts, compare their prices along with the likely species and condition. A lower price per cord does not always mean lower cost for the heat you receive, especially if the wood is wet or the amount delivered is short of a standard cord.
You can make a simple estimate by dividing the price by the approximate millions of BTU per cord. For example, if a cord costs $300 and its estimate is 20 million BTU, the rough cost is $15 per million BTU. This is only a comparison tool: it does not account for moisture, delivery amount, stove efficiency, or how you operate the appliance.
Bottom line: sugar maple and white ash are close by these estimates. For red or silver maple, ash has the higher estimated heat per cord, assuming both loads are equally dry and properly measured.
Processing and storing ash or maple firewood
Processing means cutting and splitting logs to a size your appliance accepts. Seasoning means letting the split wood dry. These steps affect how safely the wood can be handled and how well it burns, but they do not change the species-based BTU estimate into a guaranteed appliance output.
If you cut your own firewood, use the chainsaw manufacturer’s instructions for the saw, bar, chain, fuel, and maintenance. Do not choose chain dimensions, fuel mix, or engine settings from a general rule. Wear chainsaw-rated leg protection, a helmet with eye and face protection, hearing protection, gloves, and protective footwear.
Before cutting, check footing, nearby people, overhead hazards, and how the log may move. Support the wood so it cannot roll or shift. A cut can close on the bar, trapping it, or a log can move suddenly. Assess where the wood is under tension or compression; do not force a trapped saw. Stop and release it safely.
After cutting, split and stack the pieces off the ground with space for airflow. Check moisture on a freshly split face before treating the wood as ready to burn. Follow your appliance manual for acceptable fuel size and use, and follow local rules for wood burning.
Next step: choose wood by species, dryness, and the amount actually delivered, then follow your appliance and tool manuals.
FAQs about ash and maple firewood
These quick answers summarize the main differences in BTU, species, and moisture. Use them as a starting point, then check the wood you are buying or burning rather than assuming every load matches a chart.
Does ash produce more heat than maple?
Not always. White ash is estimated at about 23.6 million BTU per cord. Sugar maple is about 24 million, while red and silver maple are estimated lower.
Which maple has the most heat per cord?
Among the maple types listed here, sugar maple has the highest estimate, at about 24 million BTU per cord. Figures can vary among reference tables.
Is white ash better firewood than sugar maple?
Their reference heat values are close. Both are estimated around 24 million BTU per seasoned cord, so moisture, price, and the amount delivered may matter more to your choice.
How many BTU are in a cord of red maple?
Red maple is estimated at about 20 million BTU per seasoned cord. Treat that as a reference figure, not a guarantee of heat from your stove.
How many BTU are in a cord of silver maple?
Silver maple is estimated at about 17 million BTU per seasoned cord in the comparison figures used here. “Soft maple” can refer to different species, so confirm the wood’s identity when possible.
Does wet wood have fewer BTUs?
A cord’s species estimate does not change, but wet wood provides less useful heat when burned because energy is used to heat and remove water. Wet wood can also make more smoke and increase creosote risk.
What moisture content should seasoned firewood have?
A common comparison assumes about 20% moisture content or less. Test a freshly exposed split face with a moisture meter and follow its instructions.
How big is a standard cord of firewood?
A standard cord is 128 cubic feet of stacked wood, often arranged as a 4-by-4-by-8-foot stack. The gaps between pieces mean this is not 128 cubic feet of solid wood.
Can I tell ash or maple BTU from the color of the wood?
Color alone is not a reliable way to confirm the species or its heat value. Ask the seller for the species, and treat broad labels such as “maple” as incomplete information.
Does a higher BTU number mean my room will be warmer?
Not by itself. The number estimates heat in the wood; the heat delivered to a room also depends on moisture, the appliance, and how it is operated. Check your appliance manual and burn dry wood.
(This article was written by one of our staff writers, Evan Bradley. Visit our Meet the Team page.)
