Wood burning heater when putting wood into stove lots of smoke comes into the house when door is opened.

It ain't drafting right or you have the damper closed. Look for obstructions in the smoke stack.
Wood burning tips

• Burn only wood. No garbage, plastics, rubber, paint or oil, briquettes, paper, etc. Burning these items releases harmful chemicals into the air.
• Burn Wise Program from EPA: Emphasizes the importance of burning the right wood.
• Build small, hot fires instead of large, smoldering ones.
• Don't "bed the fire down" for the night. Holding a fire overnight is a fire hazard and can create serious indoor and outdoor air pollution problems.
• Open your damper if the smoke is dark. Dark smoke indicates more pollution is being produced and fuel is being wasted.
• Keep your stove clean and well-maintained. Follow manufacturer guidelines; replace catalytic stove filters every 1-4 years. Have your chimney checked and cleaned at least once a year.

• Split the wood to help it dry. Wood will dry out more quickly and burn best if the wood is cut to about 3 1/2 inches to 6 inches in diameter.
• Cover the split firewood to protect it from the weather and stack it loosely in alternating layers, at least 6 inches off the ground.
• Time must be given to allow the wood to reach 20% or less moisture required for seasoned wood. This process takes approximately 6-12 months. Think ahead and buy next winter's wood well in advance.

• The Chimney cap may be plugged by debris.
• Catalytic combustor and baffles are exposed to very high heat and deteriorate as used. Replace every 1-4 years depending on use.
• Stovepipe angles and bolts are subject to corrosion.
• Gaskets on airtight stove doors need replacement every few years. Gaskets and seals are used by the appliance designer to control the location and flow of air into the appliance.
• Check seams on stoves sealed with furnace cement. Seams may leak and cause you to loose valuable heat and reduce the efficiency of the unit.
• Replace broken or missing firebricks.
• Keep the floor of your stove clean of debris and ash.