Etymology of "range" for oven

My Google-fu is weak on this one. Does anyone know why kitchen ovens are sometimes called “ranges”?

From World Wide Words:

Many thanks.

Just to clarify a bit, a kitchen range is not the same thing as an oven. An oven is a box you put food in to heat. A cooktop is a collection of burners or elements that you set a pan/pot on top of to heat. A range is a single unit that contains both an oven and a cooktop.

I thought that a range and a cooktop were the same thing, and that the unit that cotains a range and an oven is called a stove.

Go high-end appliance shopping, someplace you get to choose between freestanding, slide-ins, and built-ins. A cooktop is a burner-only installation (no oven down below - obviously not available freestanding). An oven is the thing with the big door, temperature and BAKE/BROIL/OFF knobs, and optional self-cleaning feature. A range combines the two.

A stove is (presumably) something that sits in a corner, can also be used for room heating, and burns wood, coal, or corncobs.