If one is running an unvented flame of any kind indoors for sure have a carbon monoxide detector. Even then don't risk it in sleeping quarters. Are you willing to bet your life on an electronic device? If one develops even the slightest of headaches, shut it down and get to fresh air immediately. CO has a much greater affinity for hemoglobin than oxygen, so ones hemes are quickly saturated. It really hangs on, so it's a slow process for ones system to get back to normal where it can assimilate oxygen. One does not get a redo with life.
Why "if running an unvented flame"?
Why not bring your house up to fire/safety codes and put one in regardless if you have an open flame heater or not.
Money well spent.
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