Higher efficiencies and Btu ratings deliver more heat using less wood. At 92% overall efficiency (LHV), the Classic Edge 960 HDX provides the highest efficiency of EPA Certified stick-wood burning appliances compared to outdoor appliances with a maximum output greater than 300,000 Btu/hr.
It also delivers the highest Btu rating of cord wood appliances, with a rating of 400,000 Btu/hr.Classic Edge HDX models are among the top for efficiency of all stick-cord wood heating appliances certified for sale for residential heating in the USA. *EPA cord wood Hydronic Heater list 7/28/2022.