Electric kilns are what almost every hobby and studio potter in the UK fires with. They are clean, need no flue, and are controllable to a degree fuel kilns are not. What they cannot do is reduce, and what limits them is the electrical supply available where they stand.
How they work
Resistance elements in grooves around the chamber heat it directly, and a controller switches them on and off against a thermocouple reading to follow a programmed schedule. That is the whole machine. Because heating is electrical rather than combustive, the atmosphere inside is oxidising, which is what decides how iron and copper glazes behave.
The supply ceiling
A thirteen-amp socket supports about three kilowatts, which caps chamber size and how quickly the kiln can climb. Plug-in kilns are genuinely useful for small work, tests and jewellery. A full studio kiln needs a dedicated circuit installed by an electrician, and that cost belongs in the purchase budget rather than as a surprise afterwards.
What the controller buys
Repeatability. A programmed schedule holds the slow climb through water loss, ramps to temperature, soaks and then cools at a defined rate. Since glaze surface depends on cooling as much as on peak temperature, that control is what makes one firing look like the last. It also means the kiln can be left, within reason, which nobody should take as licence to leave it unattended overnight.
Maintenance and what wears
Elements lose power gradually and are replaced as a routine job. Thermocouples drift and are cheap to change. Bricks chip and can be patched with refractory materials. A kiln that will not reach temperature is nearly always telling you about its elements, and a kiln whose cones disagree with its controller is telling you about its thermocouple.
Questions people ask about kiln for pottery
Can an electric kiln do reduction?
Not properly. Electric firing is an oxidising atmosphere, which is why some glaze effects need a gas or wood kiln.
How big a kiln can I plug into a normal socket?
About three kilowatts, which limits chamber size and climb rate. Anything larger needs a dedicated circuit.
How often do elements need replacing?
They fade gradually over many firings. When the kiln takes noticeably longer to reach temperature, elements are usually the reason.