Why Is My Smaller Wick Burning Hotter Than the Bigger One?

Yes, it can be completely normal, and it almost always means one of two things: the bigger wick is actually too big and misbehaving, or you are reading the burn by eye instead of by the melt pool. A smaller wick that reaches a clean, full melt pool without mushrooming will often look hotter and brighter than a larger wick that is sooting, flickering, and drowning itself. The wick number on the package is a starting point, not a temperature dial, and the real answer only shows up when you measure.

My husband Chad and I have run more burn tests than I can count building Garsnett Beacon Candle Co., and this exact thing tripped us up early. We assumed a bigger wick always meant a bigger, hotter flame. It does not work that cleanly. Here is what is really going on.

Why a smaller wick can burn hotter than a bigger one

The wick, the wax, the fragrance, the vessel, and the color all work together. Change one and the whole burn changes. So when a smaller wick looks hotter, it usually comes down to a few things.

The bigger wick is oversized for your vessel. When a wick is too large for the diameter and the wax, it pulls up more fuel than it can cleanly burn. That gives you a big mushroom on the tip, soot on the glass, and a tall, flickering, smoky flame. It looks dramatic, but it is an inefficient, dirty burn. Meanwhile the smaller wick burns steady and bright because it is matched better to the candle.

You are comparing across wick series. A CD, an ECO, an LX, and an HTP are braided and coated differently, so a CD 16 and an ECO 16 are not the same animal, and even inside one series the jump from one size to the next is not a neat, even step. If you want the numbers to mean something, do not mix series in the same test. I break down what those letters and numbers really mean in our guide to candle wick sizes explained.

Your fragrance load or dye is dragging the bigger wick down. Fragrance oil and dye make the wax harder to burn. A heavily scented or dyed candle needs a wick that can push through all that, and sometimes the bigger wick clogs and struggles while the smaller one finds a cleaner rhythm. If your fragrance load is off, your whole test is off, so it helps to nail your candle math first. Remember fragrance percentage is calculated on the total candle weight, not the wax weight alone.

You are eyeballing the flame instead of measuring the melt pool. This is the big one. Flame height is the least reliable thing to judge. A smaller wick can throw a lively flame while a bigger wick quietly tunnels or drowns.

How to actually read the burn, not the flame

Set up both candles side by side, in the same room, out of any draft, and run a real power burn. Here is what Chad and I look at.

1. Melt pool depth and width. After three to four hours, you want a melt pool that reaches the edge of the glass and is roughly a quarter inch to a half inch deep, with no thick ring of leftover wax. A wick that gets there cleanly is the right wick, whether the number is big or small.
2. The glass temperature. Touch the outside of the vessel after a couple of hours. If it is too hot to hold comfortably, that wick is running too hot for that vessel, no matter what the flame looks like.
3. Mushrooming and soot. A big carbon ball on the tip and black marks climbing the glass mean the wick is pulling too much fuel. That is the oversized wick showing itself.
4. Flame height and behavior. A healthy flame is usually a half inch to an inch, steady, and teardrop shaped. Tall, dancing, or flickering flames are a warning sign, not a win.

When you judge by the melt pool instead of the flame, the mystery usually solves itself. Nine times out of ten the smaller wick was the better wick all along, and the bigger one just looked exciting because it was burning dirty.

Control your variables or the test lies to you

A burn test only tells the truth if you change one thing at a time. Keep the vessel, wax, fragrance, fragrance percentage, dye, and cure time identical, and only change the wick. Label each test candle with the exact wick, the date, and the batch.

Cure time matters more than people expect, so give your test candles the same cure before you compare them. For the full process, our field guide to burn testing covers it step by step, and whether to trim the wick during testing is worth a read, because an untrimmed wick will skew what you see.

This is also where tracking saves you. When you are running three or four wicks across a couple of vessels, your memory will not keep up and loose notes get lost. Chad and I co-founded Makers Manager partly because we were drowning in scattered burn test notes. You can log each wick, each melt pool reading, and each result in one place so you can see the pattern instead of guessing. The code CBP7DAYS at checkout gives you 7 days free.

Quick questions makers ask next

Should I just go with the smaller wick then?

Only if it gives you the cleaner, fuller melt pool at a safe glass temperature. Do not pick a wick because the flame looks nice. Pick the one that melts edge to edge cleanly, stays safe to touch, and does not soot or mushroom. Sometimes that is the smaller wick, sometimes you land between two sizes and need to test a third option.

My bigger wick tunnels but the smaller one also does not reach the edge. Now what?

That usually means you are between sizes, or the vessel is a tough diameter. Try a different wick series, or consider whether the vessel needs two wicks instead of one. Our guide on how many wicks your candle needs walks through when to go double.

How many burns do I need before I trust the result?

Run the candle through its full life, not just one burn. A wick can look perfect on burn one and then tunnel or overheat by burn four as the melt pool deepens. Test the whole candle down to the bottom before you commit to that wick.

The bottom line

A smaller wick burning hotter than a bigger one is not a glitch, and it does not mean you did anything wrong. It usually means the bigger wick is oversized and burning dirty, or you are trusting the flame when you should be trusting the melt pool. Match the wick to the vessel, control your variables, and let the melt pool tell you the truth. For a running start on the rest of your setup, grab our free supply checklist and run your recipe through our candle calculators before your next test pour.