Fascinating. What country? The only non-convection oven I’ve ever seen in Germany was the fire fueled oven my grandma had, and I’m pretty sure that thing was pre-war.
Canada. It’s a standard gas oven with a broiler inside. They’re for sale, but I’ve always lived in old houses.
Same here, in the US. Natural gas dominates where I live, and I’ve only seen it for electric ovens.
It’s also still a “new” feature, in the context of major appliances lasting decades. My new oven is convection but I don’t remember it being a reasonable choice 18 years ago when I last did, it maybe that’s just natural gas
And even today, this was a “premium” feature. Most low to midrange appliances do not seem to have it
Generally (in the US) the term convection oven is used to refer to an oven that forces hot air around with a fan, instead of an oven with the radiant heating elements.
Someone else commented that all ovens are convection and the correct term is “fan forced”… which might be technically correct, but that’s just not how the terminology is commonly used at least in the US. Some newer ovens have options clearly labeled “convection” that turn on a fan, sometimes in addition to the radiant heating elements.
The main reason I think people like convection ovens or air fryers is because the air circulation crisps the outside without overcooking the inside and without all the fatty oils required in a traditional deep fryer.