Is it truly silent or is there a humming electric sound or clicking when it's on?

No it is not, look at that other answers, they are from a long time ago, I must have a newer model (early 2021), because it makes a loud BANG noise, about 5-10 minutes upon heating up and cooling down as the metal expands, so impossible to use in a bedroom if you are sleeping. Also it clicks quite a bit too just during regular operation and DeLonghi would do nothing for me on this, even though I think the newer model is defective design.

Does this heater turn on automatically when it's plugged in? My scenario is, I have a smart plug, and I want the radiator to turn on automatically .

It has a thermostat and a timer. To have the unit come on when a smart switch activates (make sure your smart switch can handle 1500 watts) the timer can be set to be on at all times. Of course it will only come on if the temperature surrounding the unit is colder than the thermostat if set for. It would be a waste of money using this model on a smart switch since the reason it is more expensive than the other heater models is that it has a built in timer.

Does the cord get really hot?

The cord should never get hot. The plug should never get hot. If you place your hand on the power plug and it feels more than just a little bit warm (you need some judgement here) you probably have a problem with a bad outlet or wiring to that outlet and should turn OFF the heater or use a much lower power setting and possibly replace the outlet and check the connections.

Does it pay to buy this expensive model vs. the lower cost model delonghi ew7707cm ?

Both heaters will output similar amounts of heat, both being 1500-watt models. The major difference of the TRD40615T is a radiator fin design that radiates less of the total heat to the sides. This means: 1) you (or family members) will be less-likely to burn yourself if you accidentally brush against it, and 2) you don't have to leave nearly as much space around the heater for safe operation (but you still have to leave space, of course). Both heaters have 3 levels of power output, and a thermostat. The TRD40615T also has a mechanical 24-hour timer.Personally, I found the built-in timer indispensable. I don't think you can just slap on a typical power-outlet timer at the end of the power cord of a 1500-watt appliance and hope it is rated to deal with that kind of juice.

Heating Coverage	Small to Medium Spaces
Heating Element	Radiant
Heat Output	1500 Watts
Fuel Type	Electric
Amperage	12.5 Amps
Min Temperature Setting	41 Degrees Fahrenheit
Max Temperature Setting	41 Degrees Fahrenheit
Number of Speeds	1
Voltage	120
Heating Method	Radiant, Convection
Recommended Uses For Product	Heating, Basement, Home
Mounting Type	Floor Mount
Room Type	Living Room, Bedroom
Additional Features	Adjustable Temperature, Child Lock, Noiseless, Manual Thermostat, Energy Efficient, Fast Heating, On Off Timer, Overheat Protection, Portable, Tip-Over Protection, Wheels
Form Factor	Pedestal
Indoor Outdoor Usage	Indoor
Power Source	Corded Electric
Item Weight	25 Pounds
Item Dimensions D x W x H	16"D x 6.5"W x 25"H
Color	White

1,500 Watt Portable Electric Radiant Radiator Heater with Mechanical Controls

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