Stove

The short answer is, Yes. there are plenty of stoves that can fit into an open fireplace, a big open old style fireplace, or even a tiled or marble fireplace with a normal size grate, an inset stove just slides right in, and connects to the existing chimney, so long as the chimney is in fairly good condition, you would not need a chimney lining, no matter what some others might say.

If your fireplace has a back boiler to heat the water, you could get a boiler stove to do the same, as in heating the water cylinder and radiators, as the pipework would already be in place, it is just a matter of connecting up to the existing plumbing. You would need to pull out the old back boiler first. most good hardware shops would have a selection of stoves that would be right for your needs, a inset stove would be a good choice to fit a normal fireplace, so long as the fireplace does not have a wooden surround, as a stove needs a certain amount of clearance from any combustible material.