There will usually be some smoke during the preheat which takes about 5 minutes. There should be no smoke after preheat when adjusted correctly. You need to put a metal shield over the insulation blanket so it would not get beat up from the wood. The vertical air tube and fuel line should also be removed and the hole covered with metal. Yes, you can.
Wood stoves, pipe, fuel storage barrels or tanks.
The lengths of the combustion air tube and the fuel line would need to be adjusted. In order to maintain high heat exchanging efficiencies we suggest the heater should be cleaned 1-2 times each heating season. Yes, you can, but you could have an oil mess when there is a power outage for more than a couple of minutes. There will be no oil flow or combustion air to keep the fire going. There is no fire hazard, because if the unburned oil running up into the heater does not start in the combustion chamber, it will not start outside of it, but you will have an oil mess to deal with.