The ekol 12 crystal defra approved stoves are hand made with traditional solid cast iron construction in the same way stoves have been made for the last 200 years but using the latest technological advances in firebox and airflow designthe crystal 12 model features ekols ultra clean burning technology which makes for an easy to use stove with a unique flame pattern less ash is produced less cleaning of the stove is required the result is a much improved experience taking the effort out of