Top positive review
Could be Better than a Kill-a-Watt device
Reviewed in the United States on February 2, 2020
UPDATED REVIEW: After 1 year of usage, no problem using it with a high-energy usage air-frier. I paid about $22 for this back in Feb 2020. One year later, I assume the supply chain issues are causing the $100 price points. Hopefully, Amazon starts carrying these directly again with a reasonable price. If and when, I'll buy a few as gifts to young adults just buying new homes to help with understanding energy usage.
The HS110 Smart Plug is more convenient than a Kill-a-Watt device because of the ability to monitor a plugged in appliance by using your phone and the Kasa app. By calculating the appliance Wattage rate, you can compute the average energy cost of an appliance. For example, if a TV draws 360w plugged into a 120v outlet and is used on average 100hrs per month, the energy cost is $4.32/mo or $51.84/yr (assuming your energy supplier charges $.12/kWh).
The Kasa app could be improved to perform these calculations for the user and displaying better information. For example, on the:
Energy Usage Page - add the measured Voltage and display the Amp Draw as well. In the TV example here:
Watts = 360
Volts = 120
Amps = 3 (Watts / Volts)
Also add a Energy Cost Page to the app - Capture (one time) the kWh cost of energy the user pays (for ex, $.12/kWh). Also capture the average appliance run hours per month (a TV for ex, 100 hrs). With the captured appliance Wattage, an Energy Cost page could show the average Monthly & Yearly costs of running that appliance. Again if a TV uses 360w of energy and is operated 100hrs per month, the Monthly/Yearly energy cost can be displayed on this page without requiring the user to perform the calculation. Capturing the actual usage hours is of course even better.
The app should also have a RESET feature to zero-out the appliance values (keeping the energy cost per kWh stored) for measuring multiple appliances. Not a huge deal since unplugging the Smart Plug performs a reset as well.
The HS110 is a nice device with greater potential as mentioned and so far, I have not experienced any arcing problems as others have described. Similar products like TopGreen are cheaper and Energy Usage stats are better than Kasa's (as of Feb 2020). However, with any of these products, you are giving them access to your network by registering the devices on their servers. Regardless of "where" their servers are located (including Amazon's AWS), the company has access to your network. So for the trade off of smart home convenience, who do you trust? TP-Link is reputable and that's why I pay a little more to use their products. I just hope TP-Link steps up their Kasa software in the area of Energy Monitoring as mentioned above. I do like the Kasa devices and by the way, the Kasa Smart Plugs do retain their ON/OFF state in the event of a power outage (another nice feature).