In a bedroom, what is the maximum input rating for a single wall-mounted unvented room heater?

In a bedroom, the maximum input rating for a single wall-mounted unvented room heater is 10,000 BTU. This limit is established to ensure safety and prevent excessive heating, which could lead to an increased risk of fire or carbon monoxide buildup in a confined space. Unvented heaters can produce combustion byproducts, so controlling their capacity is crucial in residential applications, particularly in bedrooms where people sleep and may be exposed to the potential harmful effects of poor air quality. By maintaining the input rating at this level, manufacturers and regulators can provide a balance between adequate heating and safety, minimizing the risk of health hazards associated with unvented heating.