Measuring the heat output of a wood stove can be done using a device called a heat output calculator or a stove thermometer. Here are the steps to measure the heat output:
Choose the right device: You can use a stove thermometer designed for wood stoves. These thermometers are magnetic and can be attached to the stove's flue pipe or the surface of the stove.
Read the stove's manual: Before proceeding, consult the stove's manual to ensure it allows the use of a thermometer or any other measuring device. Some stoves may have specific guidelines or restrictions on using external accessories.
Install the thermometer: If your stove permits the use of a thermometer, follow the manufacturer's instructions to place it correctly. Usually, it is attached to the stove's flue pipe, as it measures the temperature of the gases leaving the stove.
Burn a fire: Light a fire in the stove using dry and seasoned firewood. Let the fire burn until it reaches a steady state, where the temperature stabilizes.
Observe the thermometer: Once the fire has stabilized, observe the reading on the thermometer. This reading indicates the flue gas temperature, which is a measure of the heat output of the stove.
Note other factors: Keep in mind that the heat output can be influenced by various factors, including the type of wood used, the stove's efficiency, the stove's size, and the damper settings. The thermometer reading will give you an indication of the heat output, but it may not be an exact measurement of the stove's overall efficiency.
Calculate heat output (optional): If you are interested in estimating the heat output in terms of British Thermal Units (BTUs) or kilowatts (kW), you can use the temperature reading from the thermometer along with the stove's flue gas flow rate. This calculation can be more involved and may require specialized equipment.
Please note that while a stove thermometer can provide valuable information about the stove's performance, for more precise measurements and efficiency assessments, you may want to consult with a professional, such as a chimney sweep or a hearth expert. They can perform a thorough evaluation of your wood stove's performance and provide recommendations for improving its efficiency and safety.