As toasters age and are used over time, several factors can contribute to the need for higher settings to achieve proper browning:
Heating elements wear out: The heating elements inside the toaster can deteriorate or lose efficiency with repeated use, leading to reduced heat output. As a result, you need to set the toaster to a higher level to compensate for the decreased heat.
Accumulation of crumbs and debris: Crumbs and debris can accumulate inside the toaster over time. This buildup can insulate the heating elements, reducing their effectiveness and making it harder for the toaster to reach higher temperatures. Cleaning the toaster regularly can help mitigate this issue.
Thermostat calibration: The toaster's thermostat may lose accuracy or become less sensitive as it ages. This means the temperature control may not respond as well to the selected setting, requiring you to set it higher to achieve the desired browning level.
Insulation degradation: Over time, the insulation around the heating elements may degrade, causing heat loss and reducing the toaster's efficiency. This can lead to a lower heat output, necessitating higher settings to get the same results.
Wiring and electrical issues: If there are any electrical problems within the toaster's components, such as damaged wires or connections, it can affect the overall performance of the toaster, leading to the need for higher settings to compensate.
Changes in bread moisture content: The moisture content of the bread you're toasting can impact the toasting process. As bread ages or becomes drier, it may take longer to brown, requiring higher settings.
It's important to note that toasters, like many appliances, have a limited lifespan, and their performance can diminish over time. While you can try to extend their lifespan by keeping them clean and well-maintained, eventually, you may need to consider replacing the toaster if it no longer meets your toasting needs.