Summary: Detector for propane leak to be placed at low point within a house/cabin heated by propane.
Context: In the Sierra, many cabins used as second homes are heated with propane. Many owners drain their cabin and turn off the furnace when they leave. Before coming back for a weekend, one wants to turn the furnace on remotely, but make sure that there is no a propane leak. At Donner Summit (732" snow fall in a winter is not uncommon), one cabin explodes every three years due to propane leak caused by weight of ice on propane pipe.