What is the difference between radiated and convected heat and their ratio?
Radiated heat comes from the gas flame as it passes through the radiant elements, ceramic coals, pebbles or logs of the gas fire. These absorb the heat from the gas flame radiating infra-red heat into the room. Convected heat is obtained from room air which is drawn behind the “firebox”, which contains the radiant elements or fuel bed of the fire, and is then passed over a heat exchanger before returning into the room. The heat exchanger is heated by the hot flue products as they pass out of the fire on their way to the flue or chimney. The heated room air is always kept separate from the flue products. The ratio of radiant heat and convected heat varies according to the type and model of fire. To obtain convected heat the fire must have a built in heat exchanger.
