The esse one ruby woodburning stove is a british manufactured stove that has all the features and quality that you have come to expect from an esse stove the esse one stove has a heat output of 5kw and is defra exempt allowing you to burn wood in a smoke controlled zone the esse one has a 74 efficiency the stoves features a primary secondary and tertiary air supply this stove is ideal for a room of about 75m3british builtsuitable for use in smoke control zonessteel body construction with