The Smoke Exhaust Hood mounts over the load door and captures smoke that escapes during the fuel loading process. This smoke is then vented directly to the outside through a vent separate from the chimney. Reloading the boiler while fuel remains in the firebox can result in significant amounts of smoke coming out the load door. More smoke escapes when the boiler is filled to the very top. Escaping smoke can be reduced by loading when there is very little left in the firebox or loading smaller amounts of wood. When tolerance for smoke is low, the smoke exhaust hood is essential.
The Low Temperature Shutdown Feature adds a control method to prevent the boiler from attempting to fire when heat is required and the boiler has already consumed its fuel charge. Imagine that you have loaded wood into the unit that is subsequently consumed, and there is still a demand for heat in the system. Without this option, the boiler will open the air valve and engage the fan, even though there is no fuel available. The draft fan will then continue to remove heat from the boiler and send it up the flue.
This feature adds a timer that will cause the boiler to run for 10 minutes every 2 hours, without an actual call for heat. The purpose is to maintain refractory temperature above the kindling point. This reduces the need to manually relight the unit during periods of low demand. A heat dump zone is a good idea for any wood boiler, but is especially needed when this option is added
The Wood Gun wood boiler can be fitted with a backup fuel option. This option requires a dedicated firing tube for the burner that must be built in to the vessel at time of manufacture. For #2 fuel oil, the oil backup can function in an automatic switch-over scenario, with fuel oil taking over when the boiler has exhausted its wood fuel. For other fuels, such as natural gas or propane, switch-over is manual only.