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 an APHC or 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.