The upright Stockton 4 comes as a wood burner or a multi-fuel stove. Both the 4 and the standard 5 are rated at 5 kW, but the 4 takes 200 mm logs and the 5 takes 330 mm.
Carl self-certifies every installation and notifies Building Control on your behalf, so the work is signed off properly and your certificate of compliance is issued for your records.