@boredzo although modern furnaces already do a second loop through the heat exchanger, and it bleeds enough heat the exhaust gas partially condenses to water. Last winter we had a cold snap and the furnace worked fine but the water drain line froze.
I wonder if one of the reasons chp hasn’t really caught on is it’s not terribly efficient.
@aleen I’ve never gotten the bulbs to actually work, a syringe might be promising. I usually just go to a clinic.
Although I went to an ent for some sinus bullshit once and she had a microscope with a vacuum pump. “Oh just a sec” and clicked the button. Gone.