Are you thinking of installing yourself??
There were big building regulation changes back in 2000? That mean its got be signed off of you do it yourself, or fitted by an installer at massive cost!
I fitted mine myself in a pre existing fireplace, which made things easier!
http://www.stovesonline.co.uk/Is a great website for showing you what you need for installation. I sourced my liner and register plate from other places. I also back filled the chimney with vermiculite (micafil) readily available from most builders merchants.
All in all, stove £360 (Firefox 8.5kw multifuel stove) £400 for 10m of liner, £30 for carbon monoxide meter, £100 for vermiculite, £50 for pipes/fittings and fire cement.
So did it all for £1000. If I'd got someone else to do it it would have cost £3000+
It's not 'signed off' but I did it 100% properly and safely! Two years later still going strong and saving me a fortune in heating my drafty old farmhouse!
One tip.... Buy the correct sized stove!! Our room calculator said 4kw was enough for the room size. But allowing for drafts and heating other rooms went for the 8.5kw!
Enjoy