Is unit energy efficient

Pauline - I'm an Energy Conservation Engineer. Electric heaters in general are 100% efficient. In other words, 100% of the power that goes into it is converted to heat - except for what it takes to power the fan and the oscillation of the unit. However, fans like this use an extremely small amount of power for the fan and oscillation. If you use this to reduce the amount of heating from your central heating unit (furnace), then it's extremely "efficient" and can save you a lot of money. A natural gas burning furnace is usually only 80% to 90% efficient. A good portion of heat goes out the roof through the flue pipe (exhausting the products of combustion which can be dangerous). Natural gas is usually cheaper than electricity per unit of heat, however, so many people think gas heat is more efficient than electric heat, but it's the opposite. By now, you're probably sorry you asked... :o)

Durability: will it stand up to limited but daily use for six months or longer without the heating element burning out?

I have used it almost every night for about 12 hours per day, every day, at the highest heat setting and with the oscillation motor running for over 5 years. It started to make a humming whine a couple days ago, but still functioned normally otherwise. I just took the back cover off for the first time (it's held on by 5 torx screws and two clear plastic stickers) and used a tiny hose/brush attachment on my handheld vacuum (the kind I usually use to clean electronics, like keyboards) and pair of long, bent-tip tweezers (used to apply individual fake eyelashes or thread overlock sewing machines) to clean out all the dust and fur from inside the heater. Especially reach inside the cylindrical fan at the center from the top and bottom cups to pick the clumps out and vacuum brush the curved fins. Be careful not to remove all the grease on the bottom plate, or if you do have to wipe some off to get the dust, you can replace it with your own, fresh machine grease. I put the cover back on and plugged it in. Now, it works like it was brand new, no strange noises, and it's putting out a lot more heat and pushing it further around the room like it used to when it was brand new. I have bought two other space heaters since I bought this one. The Vornado literally melted itself with a few months and the Crane had to be rewired after a couple months, is weak, has no tipover protection, and can only heat a small closet or bathroom. This Lasko is the best space heater I have ever owned or used I would highly recommend it to anyone.

Approx how many sq feet is it best used to heat?

This heater works well in 100 sq ft above 53 degrees. Below 50 degrees low temperature an additional Lasko heater may be necessary depending on what your insulation and window type that you have. I still love mine.

Will this shut off if knocked over?

I have the 6410 and on the front of the box, the Tip Over Protection box is NOT checked. But there is supposed to be overheat protection. So, I would think that may mean that if the outlet is blocked, it might then shut off. But I won't risk trying that.

Heating Coverage	300 Sq. ft
Heating Element	Ceramic
Heat Output	1500 Watts
Fuel Type	Electric
Amperage	12.5 Amps
Min Temperature Setting	60 Degrees Fahrenheit
Max Temperature Setting	85 Degrees Fahrenheit
Number of Speeds	2
Voltage	120 Volts
Heating Method	Convection
Recommended Uses For Product	Office, Bedroom, Home
Mounting Type	Floor Mount, Tabletop Mount
Room Type	Living Room, Bedroom, Home Office
Additional Features	Energy Efficient, Portable, Overheat Protection, Cool Touch Exterior, Manual Thermostat, Adjustable Temperature, On Off Timer, Oscillating
Form Factor	Tower
Indoor Outdoor Usage	Indoor
Power Source	Corded Electric
Item Weight	6.5 Pounds
Item Dimensions D x W x H	10"D x 10"W x 16"H
Color	Gold

Lasko Oscillating Designer Series Ceramic Space Heater for Home with Adjustable Thermostat, Timer and 2-Speeds, 16 Inches, 1500W, Beige, 6405

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