Kiln Elements: Signs of Wear, Element Life and Replacement

Kiln elements are the heating coils of an electric kiln, and they are a wear part like tires on a car. Every firing oxidizes them a little, and after enough firings the kiln cannot reach temperature on time. This guide explains how kiln elements work, the signs that they need replacing, how makers say to check them, how long they last and what replacement involves. It is research-based: we compare maker manuals and published guides; we do not service kilns. For any work on a kiln, follow your maker's manual with the power disconnected, or use a qualified kiln technician.

What kiln elements are and how they work

An element is a long coil of resistance wire that sits in grooves cut into the soft firebrick walls. Current through the wire makes heat, and the brick holds it in. Most pottery kiln elements are an iron-chrome-aluminum alloy (The Pottery Wheel names Kanthal A-1 as the most common); L&L, for example, offers APM, an alloy it describes as made for high temperature use, on some models.

The aluminum in the wire forms a thin oxide skin when the element is first heated. That skin protects the core. Skutt explains that element life depends on how fast this oxidation goes, and that the hotter the element runs, the faster it oxidizes.

Each kiln's elements are matched to its voltage and phase. A 240 V element and a 208 V element for the same kiln are different parts, which is why element orders start with the data plate. Elements are one of three parts that wear on a digital kiln; the others are the relays that switch them and the thermocouple that measures temperature.

How kiln elements wear out

Heating and cooling crack the oxide skin, which exposes fresh metal that then oxidizes. Skutt describes the result: the core thins, the element grows longer and the coils creep closer together. As the core thins, resistance rises. Higher resistance means less current and less power, so the kiln heats more slowly.

Skutt also notes that elements soften above about 1,700°F (927°C), which it compares to cooked spaghetti. Soft elements can sag out of a damaged groove and break. Things that speed wear, according to Skutt and other published guides:

• Firing at or near the kiln's maximum rating, especially long cone 10 firings.
• Long holds and slow cools at peak temperature.
• Dust, loose brick and bits of clay or glaze in the grooves, which Skutt says can burn right through an element.
• Glaze drips or a piece melting onto an element.
• Reduction attempts in an electric kiln, which Skutt says will clobber element life.

Signs your kiln elements need replacing

Element wear shows up in the firing results long before a coil breaks. Watch for these signs:

1. Firings take longer. Skutt's service manual lists longer firing times as the first sign of aging elements. A firing log makes this obvious.
2. Results change. Skutt's manual notes that aging elements can even fire ware to a higher cone than usual, because a slower climb adds heatwork. As wear goes on, the kiln stalls instead: witness cones bend less and glazes look dry or underdone.
3. Slow-heating error codes. Skutt's E-1 means the kiln climbed slower than 12°F per hour for 22.5 minutes, and E-3 means it fell 50°F below a hold temperature; both list worn or broken elements among the causes. Orton controllers show FTH (fail to heat). Our kiln controller guide lists more codes.
4. Uneven firings. Ware at the top fires differently from the bottom, which can mean one element has failed while the others carry the load.
5. Visible damage. Coils sagging out of the grooves, stretched sections, breaks or glaze stuck to the wire.
6. An element does not glow. Skutt's manual describes looking through the peepholes at a low glow, around 600 to 1,000°F (316 to 538°C), wearing #3 green or gray welding-shade glasses. A dark element is likely broken.

A slow kiln is not always the elements. Low supply voltage, a burned-out relay or a drifting thermocouple can look the same, which is why the next step is a proper check.

Checking element resistance the way makers describe it

Makers judge element wear by resistance. Skutt's service manual says to measure each element with an ohm meter, compare the reading to the listed resistance for your kiln model, voltage and phase, and replace the elements if they are more than 5 percent above the recommended value. The manual also explains how a broken element shows up on the meter.

There is an easier check on many digital kilns. Skutt's KilnMaster runs voltage and amperage tests through a built-in current sensor, and Paragon's Sentinel Smart Touch reads circuit volts and amps during a firing. Amps that drift down from the kiln's rated figure over months point to aging elements, with no meter and no opened panels.

How long do kiln elements last?

Makers do not publish a firing count, because use varies so much. Third-party guides give rough ranges: The Pottery Wheel estimates 100 to 200 firings for a mix of bisque and cone 6 glaze firings, with fewer at cone 10 and more at low fire. Hot Clay, a UK dealer, reports some kilns going well past 100 firings and others showing wear after 20 to 30.

The biggest factors are how hot you fire, how close that is to the kiln's limit and how clean the grooves stay. Skutt's advice is to choose a kiln rated above the cone you fire most; a cone 10 kiln used at cone 6 spends less time working hard. Track the firing count on your controller or in a log so you can see wear coming.

Replacing kiln elements: what the job involves

Element replacement is a maker-documented repair, but it is still electrical work on a kiln, so this guide does not give wiring steps. Skutt publishes an element replacement document and video for its kilns, and other makers publish their own. Follow your kiln's manual with the kiln unplugged or the breaker off, or have a qualified kiln technician do it.

Ordering the right elements

• Read the data plate for model, voltage and phase before you order.
• Note element positions. Many kilns use different elements top, middle and bottom; Krueger Pottery's Skutt 818 listing numbers them top down.
• Match the element style. L&L says all elements in a kiln should be the same style.
• Buy factory elements for your exact model rather than generic wire.

All at once, or one at a time?

If one element has failed early, for example from a glaze drip, replacing just that one can make sense. When elements are worn from age, the advice runs the other way: Skutt's manual suggests replacing all of them if they are old and brittle, Ceramic Arts Network's replacement article recommends a full set because one failure often signals more, and L&L says its B Series kilns must have all elements replaced at once.

What elements cost

Element prices depend on kiln size and position. As one example, a full set of four elements for a Skutt 818 sat in the $200 to $300 band at a US dealer in October 2026; larger kilns use more and longer elements. Check the live price with your dealer, and budget for a technician's time if you are not doing the work. Our kiln cost guide covers running costs.

Brick and grooves

Skutt notes that element replacement is a good time to repair damaged brick, since elements droop out of broken grooves. Our kiln bricks guide covers maker repair cement and when to call a technician.

The first firing with new elements

Skutt gives two steps for new elements. Vacuum the grooves first to remove shipping dust and brick crumbs. Then fire the kiln empty, using a cone 04 medium-speed cone fire program, so the new oxide skin forms without fumes from clay or glaze. After that, a test bisque with witness cones confirms the kiln fires evenly again.

How to make kiln elements last longer

• Vacuum the element grooves at least monthly, with the kiln off and cool, as Skutt suggests.
• Vent the kiln. Skutt recommends a downdraft vent; without one, it says to prop the lid a couple of inches until 1,000°F (538°C) and leave the top peephole out. See our kiln vent guide.
• Keep glaze off the elements: wipe foot rings clean, use cookies or kiln wash on shelves, and keep ware away from the walls.
• Avoid long holds at peak unless a glaze needs them.
• Do not attempt reduction in an electric kiln.
• Keep elements seated in their grooves; Skutt says element pins hold them in place.

Our kiln maintenance guide puts elements into a full yearly routine.

Common mistakes

• Blaming elements without checking supply voltage, relays and the thermocouple.
• Ordering elements by kiln size instead of the data plate's voltage and phase.
• Mixing old and new elements of different styles.
• Loading a glaze firing into a kiln with brand-new elements instead of firing it empty first.
• Opening the control panel with the kiln plugged in.

Safety notes

• Disconnect power (unplug, or switch off the breaker for hard-wired kilns) before any inspection that opens a panel, as the manuals require.
• Never touch elements or look inside the switch box during a firing.
• Have a licensed electrician check the circuit if errors point to low voltage.
• Old elements and brick crumbs are dusty. Vacuum with a HEPA vacuum and wear a NIOSH-approved respirator for dusty cleanup; never dry sweep.

What you need

For element care you need a vacuum with a narrow nozzle, a firing log, witness cones and your kiln's manual. If your kiln is old enough that elements, relays and brick all need work, compare the cost against a new kiln in our best electric kilns guide.

Sources: Skutt service training manual (error codes and element section, dealer-hosted copy); Skutt "Top 5 Ways to Extend the Life of your Kiln Elements"; Skutt repairs and element replacement pages; Skutt KilnMaster controller page; L&L Kilns elements parts page and element holder history page; Krueger Pottery Skutt 818 element listing; Ceramic Arts Network "How to Replace Electric Kiln Elements"; The Pottery Wheel "How Long Do Kiln Elements Last?"; Hot Clay knowledge base on element changes; Paragon controller details from our Paragon review. Specs checked October 2026.