Stoves can be easily self-installed but you need building control approval (which is easily done). You may wish to have your stove installed by a Hetas registered installer in which case you do not need building control approval. more information on stove installation.
Westfire are a Danish company that make unique contemporary stoves. They use the latest technology to make cleanburning stoves that have very low emissions and high efficiencies.
Some Westfire stoves are over 80% efficient which is amazing.
The ones I like best are the Westfire 15, Westfire 16, Westfire 20 and Westfire 21 - all these stoves are fairly tall and rounded with big curved windows.