Get yourself down to a car boot sale and pick up a fireback. Buying them new is expensive, but I see countless firebacks and fire grates on boot sales - could try Gumtree too.
With a fireback an open fire can kick out a lot of heat into the room as the heat gets directed forward rather than being pulled up the chimney.
I have two woodburners but I grew up with coal fires and drink in pubs that have them.
Back in 1980 we looked at a fire grate that had a fan to blow air through a heat exchanger tube at the back of the fire and then out into the room at floor level. It wasn't suitable for the fireplace we had built but was said to very good in normal fire places.
I have a "straight-up" chimney and it doesn't throw out as much heat as the "proper" fireplace I had in the last (Edwardian) house. Yes, as has been mentioned you are going to lose a lot of heat up any chimney, open fires are inefficient.
But the one I have certainly heats the room nicely (big living room) even with the window open a crack to help with the draw.
I had to fit a Rotovent cowl to improve the draw (brilliant bit of kit!) and I burn the super hot smokeless coal nugget things that put out a lot more heat than ordinary coal or wood. You certainly can't sit close to it when it is really going without melting your face!
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