My Candle Tunnels During Early Burns but Becomes Too Hot During Later Burns — How Do I Choose a Wick When One Size Doesn’t Seem Perfect Throughout the Jar?

Is it really no perfect wick? Two checks first

An early tunnel and a late hot jar can both come from how the candle was burned rather than what it was made with. A first burn cut short at an hour or two, or burned in a cold room or under a fan, leaves a ring that later burns never close; the wick was never given the chance to reach the edge. Late burns that run long, back to back, on an untrimmed wick, make any jar run hot. Run the table below against your own log before you test a single option.

Rows 1, 2 and 6 cost nothing to fix and should be fixed before any option is tested, or the options round will measure your habits. Row 5 is worth a sentence: at a lower load or with a lighter oil, the same wick sometimes spans a jar it could not before, which is a load question (wick or load at 10%) rather than a wick-type one. Rows 3 and 4 are the real subject of this page. The final-third checks that define "too hot" are the hot-jar post; the first-pool limit that defines "tunnels" is yours, and whether a slower first pool can be accepted with care instructions is the slow-first-pool decision.

Why one wick can't span some jars

At the top of a container candle, the wick has to melt wax out to the widest diameter the pool will meet, in a jar that starts at room temperature, with the flame in open air and losing heat to the room. Near the bottom it burns in a warm jar, sheltered by glass, over wax that may already be warm, and the diameter may be smaller. The top is the hardest place to make enough heat; the bottom is the easiest place to make too much. A wick sized for one end is, in some jars, simply the wrong size for the other.

The 150 g jar in the worked example shows how small the geometry can be and still matter. Its page gives an outer rim of 7 cm and a base of about 6.5 cm; taken as circles (an illustration only; no CSI listing states an internal diameter), 7 cm is 38.48 cm² against 33.18 cm² at 6.5 cm, 16.0% more surface at the rim. Its page also calls the jar a "curved silhouette" in one line and a "straight-sided surface" for labels in another, so read neither as a profile: measure inside at three heights. How a changing diameter maps onto burn behaviour is the diameter-at-height post; the choice of wick for a jar that narrows toward the bottom is the narrowing-jar retest.

That leaves four levers, and none of them is "a better size". You can change the kind of flame (wick type), the number of flames (double wick), how much of the jar the candle occupies (fill height), or the jar itself.

The no-perfect-wick options table

The table sets each option against what it tends to fix, what it costs at CSI live pricing on 26 September 2026, and what it risks. "Tends to" matters: these are tendencies, and the options round below is how you find out what they do in your jar. Wick costs are per candle; the fill and jar options change other costs instead.

Two things the table does not show. Labour: wooden wicks need their char trimmed and a clip seated properly; double wicks need two centred wicks per jar; a new jar needs a new bracket. And supply: a wick that costs ₹53.10 more per candle than an Eco C1 is a large share of a small candle's material cost; on 1,000 candles, wooden wicks even at the 100-pack price cost ₹35,400.00 more than C1.

The options round: one option per pair

Test only the options that suit your jar; the worked example uses the 7 cm 150 g jar, so Cotton Braided (for jars over 8 cm) and double wicks are left out. That leaves three pairs, six candles, all poured from one batch of CSI 464 with Sage and Cedarwood at 8% of total weight, at 80–85°C (the jar page's 85°C governs):

Costs are worked examples and exclude labour, freight, packaging and GST. If you already own the wax, jars and C1, the new cash is ₹1,286.20 (the oil and a pack of wooden wicks); from nothing it is ₹2,796.60. In your own production oil the test is more useful still. For a jar over 8 cm, add a Cotton Braided pair; for a wide jar, a double-wick pair on a holder (the double-wick bracket itself is 3251).

Choosing among options that pass

If two or more options clear both gates, rank them on four things, in this order (our judgement): what the customer gets (a reduced fill is a smaller candle; a wooden wick is a different experience that some customers want and some don't), cost per candle (wick, wax and oil; the chart at the top gives the wick part), labour (clips, char trims, two wicks to centre) and supply (a wick you can buy in the volume you need). A lower fill that passes both gates at ₹17.61 less material per candle is a good answer if your customers are buying a scent more than a size; a wooden wick that passes is a good answer if the crackle is part of what you sell and the per-candle cost is priced in.

Two cautions. The per-gram price of your oil changes the fill-height sums: for Sage and Cedarwood, the 1 kg costs more per gram than the 500 g, so production maths should use the 500 g price. And a passing option is proven for that jar, that oil and that load. A new scent in the same build needs at least a final-third check before it ships (when a wick retest is mandatory).

What not to buy while the options are open

When a wick won't behave, people buy the whole wick wall. We would rather you bought two options in packs of 10 and let the gates decide, even though that means selling you less.

What the round does need is small: one pack of wooden wicks if that option suits your jar, the C1 you probably already own, a 100 g oil and six jars. If your early tunnel turned out to be a first-burn habit, it needs nothing but a longer first burn and a care line.

Wicks and holders for the options round

Five items: the two wick types the options table turns on, the Eco rungs you have already tried, the holder a double-wick option needs, and the oil in the worked example. Chosen on page statements, per-unit price and stock on 26 September 2026; CSI has no measured burn data, so nothing is ranked on performance. The oil table shows every size, candles at 12 g and options rounds at 68.8 g.

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