Don't connect your smart plug to these 5 household devices: An expert warns

At a glance:

• Avoid smart plugs with heavy-duty appliances like refrigerators and AC units
• Never use smart plugs for critical medical devices such as CPAP machines
• Power strips and heating devices pose unique risks when paired with smart plugs

Heavy-Duty Appliances and Smart Plugs

Most smart plugs are rated for 15A, making them suitable for lamps, televisions, and fans. However, heavy-duty appliances like full-size refrigerators, window air conditioners, and deep freezers often exceed this limit. Even if a 20A circuit is available, the smart plug itself remains capped at 15A, risking overheating and tripped circuits. The article emphasizes that exceeding a smart plug's capacity can lead to internal component degradation, burnt smells, or even fire hazards. For example, a space heater drawing 1,800W could push a 15A plug beyond its limits, causing irreversible damage.

Critical and Continuous Use Devices

Smart plugs are not suitable for medical equipment requiring uninterrupted power. Devices like oxygen concentrators, CPAP machines, and life-support systems must remain plugged in continuously. A smart plug's automation or accidental disconnection could endanger users. The article specifically warns against using smart plugs for these devices, advising direct wall outlets instead. This is especially critical in emergencies where power loss could have life-threatening consequences.

Power Strips and Load Stacking

Plugging a power strip into a smart plug creates a risk of inadvertent load stacking. When multiple devices are connected to the power strip, their combined wattage may exceed the smart plug's 15A limit. For instance, a power strip with a lamp (100W), a charger (50W), and a fan (100W) totals 250W, which is within safe limits. However, adding a high-wattage device like a microwave (1,200W) could trigger overheating. The article recommends checking device loads and avoiding smart plugs for power strips with high-power combinations.

Heating Devices and Fire Risks

Heating devices such as hair dryers, toasters, and space heaters should never be connected to smart plugs. These devices generate extreme heat and may exceed the plug's wattage limits, leading to overheating. The article highlights that smart plugs lack the thermal management of dedicated outlets, increasing fire risks. For example, a hair dryer's wattage spikes during use could cause internal components to fail, even if the plug's rating is not exceeded. The expert advises using wall outlets for such devices to eliminate automation-related hazards.

Automatic and Compressor-Equipped Devices

Appliances with compressors, like refrigerators and dehumidifiers, should not be controlled via smart plugs. These devices require stable power to equalize internal pressure when shutting off. A smart plug's rapid on/off cycles can damage compressors or trigger protective systems. The article notes that even if a device's wattage is within limits, the mechanical stress from frequent power interruptions can shorten its lifespan. For continuous operation, direct wall outlets are recommended.

Safety Tips and Alternatives

The article provides practical advice for safe smart plug usage. First, always check device specifications for wattage and amperage. Second, avoid using smart plugs for high-priority or heat-generating devices. Third, consider upgrading to smart appliances designed for automation. For example, smart thermostats or refrigerators with built-in connectivity eliminate the need for external smart plugs. The expert also stresses the importance of monitoring smart plugs for signs of wear, such as warping or burnt smells, which indicate potential failure.