Electric Kiln vs Gas Kiln: The Choice That Changes Your Glazes

The first question most people ask about kilns is about temperature. The second is about cost. Both matter, but neither gets at the real difference between electric and gas firing, which is about atmosphere — specifically, whether the firing environment is oxygen-rich or oxygen-poor, and what that does to the chemistry of your glazes.

An electric kiln fires in what's called an oxidation atmosphere: there's plenty of oxygen in the chamber throughout the firing, and glaze minerals behave predictably. Iron gives warm ambers and rusts. Copper gives greens. The colors you put in tend to be the colors you get out. Electric kilns are consistent, controllable, relatively affordable, and work well in a home studio or a small workshop. For a huge range of glaze effects — from crisp whites to deep celadons to matt surfaces — they're completely sufficient.

A gas kiln can do something different. By restricting the air supply at specific points in the firing, you can create reduction — an oxygen-starved atmosphere where the burning gases pull oxygen from the metal oxides in your glazes and clay body. Iron in a reduction atmosphere can shift from amber to grey, warm brown, dark black, or the silvery metallic sheen of a well-reduced iron glaze. Copper in reduction turns red: the rich, unpredictable sang de boeuf and copper red glazes that Chinese potters perfected centuries ago, which are simply not reproducible in oxidation at any temperature.

The Electric Kiln Case

For most people starting out in pottery, an electric kiln is the right choice. They're much simpler to operate: set the controller, walk away. No gas supply to manage, no burners to tune, no ventilation requirements beyond a basic extraction fan. They're significantly cheaper to buy at comparable sizes, and the running costs depend on your electricity rate but are generally manageable for studio use.

Electric kilns fire very evenly throughout the chamber, which means consistent results across a full load of pots. Troubleshooting is straightforward: if a firing goes wrong, the variables are limited. For functional pottery, decorative work, and earthenware through high-fire stoneware, electric kilns produce beautiful results consistently.

The upper temperature limit of most electric kilns is around cone 10 (around 1280–1300°C), which covers the full range of stoneware and even most porcelain work. The elements do degrade over time, particularly in high-fire work, but replacement is routine rather than catastrophic.

The Gas Kiln Case

Gas kilns require more investment — in the kiln itself, in the gas supply infrastructure, and in ventilation. An outdoor or heavily ventilated space is essentially mandatory, which puts them beyond reach for many home studios. The learning curve is steeper: reduction firing requires understanding how to read the kiln, adjust the damper and burners at the right moments, and respond to what the kiln is doing rather than simply programming a schedule.

What you get for that investment is access to a different range of effects. Raku pottery uses a form of gas firing. Soda and salt firing — where sodium compounds are introduced into the kiln at peak temperature to create a glassy, textured surface directly on the clay — require gas kilns. The deep carbon-trapped surfaces of pit firing and wood firing are variations on the same principle of atmosphere interaction.

Many serious studio potters use both: an electric kiln for production work, testing, and work where consistent oxidation results are the goal; a gas kiln for reduction firings, special effects, and the kind of work where the unpredictability of the process is part of the point.

Temperature and Cone System

Both kiln types can reach the temperatures used for the full range of ceramics. Low-fire earthenware fires between cone 06 and cone 02 (around 1000–1100°C). Mid-fire stoneware between cone 4 and cone 6 (around 1180–1220°C). High-fire stoneware and porcelain at cone 9–10 (around 1260–1300°C).

The cone system measures heat work — the combined effect of temperature and time — rather than temperature alone, which is why experienced potters talk in cones rather than degrees. A slow firing to cone 6 and a fast firing to the same temperature number give different results in the clay and glaze.

Electric kilns are available for all of these ranges. Gas kilns are typically used for mid-fire and high-fire work, where the reduction effects are most pronounced. The choice of firing range interacts with the kiln type choice: if you're drawn to the warm, earthy surfaces of cone 10 reduction stoneware, a gas kiln is eventually part of that path.

Starting Out

If you're setting up a home pottery space or joining a community studio, electric is almost certainly where you'll begin — and it's a complete starting point, not a compromise. The range of work possible in oxidation is enormous. Gas firing is something to explore when you know what you want from it and have the space to do it properly. Many excellent potters work exclusively in electric kilns throughout their careers. The pots don't know what fired them; they only know what was made.