Two thoughts.  One a heater burns more hours than a oven or cook  top.  Two. 
Most heaters have a higher B T U rating, therefore likely have larger burners, 
consuming more gas, therefore more exhaust gas for lack of a better term.  
Exhaust gas also contains solid particles, not just gas.    That is why 
furnaces and heating stoves are usually vented to the outside.  Unvented 
heaters also may be needing  more oxygen, with larger burners and if the house 
is tight it isn't getting enough and then isn't burning clean as it would with 
sufficient air intake.
There may be other reasons, but these seem the most  logical to me.
Ron
  ----- Original Message ----- 
  From: Rick Hume 
  To: blindhandyman@yahoogroups.com 
  Sent: Monday, February 01, 2010 3:44 PM
  Subject: Re: [BlindHandyMan] Why does my Propane heater burn so dirty?


    
  Good question Jerry! And since you asked, I am wondering why my garage 
natural gas heater smells strongly like gas when operating. The unit is only a 
few years old, and I clean it out frequently, but I am now getting the gas 
smell when it's burning.
  ----- Original Message ----- 
  From: Jerry Richer 
  To: blindhandyman@yahoogroups.com 
  Sent: Monday, February 01, 2010 4:19 PM
  Subject: [BlindHandyMan] Why does my Propane heater burn so dirty?

  I have a 100 pound Propane tank outside the house. I have three
  Propane appliances that run off that tank. They are an ordinary cook stove,
  an ordinary double oven, and a Propane space heater.
  The stove and oven burn perfectly cleanly, no smell, nothing, just
  heat. The space heater gives off smoke, it stinks, and the walls all around
  the living room where the heater is are darkened about ten feet off the
  floor.
  Why do the stove and oven burn so cleanly and the heater so dirty?
  I know I'm supposed to clean the heater every year. Why is it that I
  never have to clean the stove or the oven?
  Thanks.

  Jerry

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