It’s difficult to say how long a wall heater will run on a 20 lb tank of propane because there are many factors that can affect its fuel consumption, such as the size and efficiency of the heater, the temperature of the room, and how often the heater is used.
In general, a 20 lb tank of propane can last for several days to several weeks, depending on these factors. To get a more accurate estimate of how long a propane tank will last with a particular heater, you can consult the manufacturer’s instructions or talk to a professional. It’s also a good idea to keep an extra propane tank on hand so you can easily replace it when it runs out.
