Instruction: Given a question and the related document, and generate the answer to the question based on the information provided in the document.

Input:
Question: Can it be set to stay on rather than use the thermostat?
Document: This item was purchased to heat, or at least take the chill off a hunting cabin.This model does a terrific job. It is quiet considering it's output, easy to set up and operate, and maintains a rooms temperature simply by setting the thermostat like a whole house system.
I've been using my heat exchanger for about six weeks, to heat approx. 600 square feet in the den and adjoining kitchen of an older house that is not insulated to modern-day standards. It really does the job. I keep it set at 71 degrees when I'm home, turning it down a couple of degrees at night or when I step out. The thermostat control seems accurate and consistent.
Provides heat nicely as advertised. However, as noted in other reviews the thermostat (auto shutoff once desired temperature is reached) does not work in low power mode. Since I purchased this for bedroom use I needed a relatively quiet unit. I did not expect it to be  silent, just quiet enough so as not to interfere with sleep. Unfortunately, it was too noisy for that. Perhaps all heaters with fans suffer from the same issue. I replaced this heater with an oil filled electric radiator.
It doesnt feel quite radiant heat once you get too far away from it but the thermostat doesn't lie.The quartz heats in 20 sec and the fans churn out a really toasty warmth in under 30 seconds. It's fast enough to heat a small space quickly and powerful enough to heat a huge amount of space.I'm really impressed with the thoughtfulness of the design also. Remote control and on - board button control makes it a joy to use. The  built in wheels gives it portability and mobility.
When I bought them I assumed the 6101 would heat more area than the others, but this does not seem to be the case and the 755320 is my favorite. They all come with a remote control, which I don't use. Both the 755320 and the 6101 Heat Exchanger work great when you set the temp because once its reached no power is being consumed so there is significant savings compared to say baseboard.
Lasko Heat Exchanger works really well. Its a good product. The best feature on this product is the temp gauge. It keeps my 5 year old son's room at a set temp, so he dose not freeze or sweat. Best use for this product would be for a closed room, but i think it would get the job done in an open area as well. It is a little pricey, but u do get what u pay for.
Puts out lots of heat. Strong blower. Not as hard as a furnace but stronger than a tower heater blower. Quiet , soft low sound blower that s not noticeable. I use it in the living room (18X24 with 11 ft. Ceiling) where I watch TV.. Takes the chill off the rooming in moderate weather (40-60 degrees). I have it set at 65 degrees because I do not like a hot room. The timer works well.
Our main floor has 900sqft of open kitchen, living & dining room with lots of windows, and I run the Lasko Heat Exchanger in the dining area where together with the kitchen the ceiling is 9'; in the LR it goes to 26'. Where the ceiling is low the area stays comfortable set on high if its really cold, and low if its above 25F; I need to add another for the LR area. Our bedroom is 300sqft with 18' ceilings and we use model 755320 Ceramic Tower.
We purchased two of these heat exchangers and they are great. We love that theyare so compact and have a thermostat to control the heat so we don't have to keepadjusting them. We also like that the housing stays cool to the touch.We would recommend them to anyone. They were just what we needed.
I think it was the thermostat or a relay that went bad. What a shame having to throw away an almost brand new heater in the trash!This heater is different. It is infrared heating, and it has a blower motor. It has a thermostat, which can dial down the heating elements to save you some electricity. It heats up a medium sized room very quickly. For a small bedroom, it is inappropriate as it is too much heat, so I don't recommend this for small rooms.
Answer: I believe it can.  I just started using it the past few days since it just recently started getting cold at night here in the northeast.  When you first turn it on it's on HI.  The instructions state to leave it on HI until it warms the room then adjust the temp.  The economy setting is 72 plus or minus 3 degrees (more like plus 3).  But I would say you could just leave it on HI unless the unit overheats and kicks it self off but I wouldn't want to see my light bill!   Not sure of the cost of running it since we just got it.  It appears to be a solid unit and I've always had good luck with Lasko products.  The unit is smaller than what you would expect but it puts out great.  Hope this helps.