Regain control over your heating costs by installing the Sønderskoven Inset. Equipped with all the latest technology, it ensures you get more heat from every log. In independent tests, the Sønderskoven Inset achieved efficiency of 77.1%. Compare that to a standard open fire, which utilises about 25% of what you put in. (Solid Fuel Technology Institute, 2013.) Thanks to revolutionary TripleBurn, the Sønderskoven Inset delivers far more blaze for your budget.