We have two wood burners, one for wood and the other a multi fuel burner. The multi fuel burner keeps in all night if you wish. Whatever you do a wood burner must be fitted by a HETAS registered fitter. CO2 can escape from badly fitted stoves, and they must comply with building regs. Flues, cowls, hearths etc
A CO2 monitor must be fitted in the same room as a stove.
We have two Charnwood stoves, which we bought separately and the fitter fitted them. I'd suggest viewing the stoves first and then getting the cheapest price for the model, online.
Costs depend on the model chosen and KW output, the engineer will advise you. We had 3 quotes for fitting and had some extra work done to the fireplaces, the cost for fitting was around £1500.
Hope you enjoy your stove, when you get it.