The propane tanks have an automatic switch-over. One goes empty and it uses the other. There is a visual thingie (not a technical term!) which tells you this has happened, so you can fill the empty tank and have it ready to automatically switch back. Propane lasts a very long time, except when using the propane heater. We mostly use a electric floor heater, which is quieter and takes the chill off without the noise of the main heater.
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