Technical Booklet L Combustion Appliances and Fuel Storage Systems·Page 19
Definition: Flueless Appliance
A combustion appliance designed to operate without connection to a flue system.
Flueless appliance – one which is designed to be used without connection to a flue. See Diagram 1.3(g).
Source — /Users/richardhill/Documents/planning-arch-project/data/documents/regional/Technical Booklet L - Combustion Appliances and Fuel Storage Systems.pdf