Instruction: Extract information from the supporting document to answer the given question.

Input:
Question: how hot is the heat coming out of heater?
Document: I purchased this heater last winter and it worked very good. This year it won't start, spark is ok but no fuel coming up into combustion chamber. After some tinkering with the heater it eventually went to the junk yard.
I use this to heat my uninsulated 24x40 shop. Its loud, its noisy but man does it make it warm. Down side is finding that I have to leave a door cracked to keep from getting light headed from exhaust fumes.
Looks high quality, packaged well.One neat feature we did not except was the unit iself (the black part) is cool to the touch even while its blowing out MASSIVE heat. We are pleased with this purchase and the temperature thermostat works well and is pretty responsive. It is noisy, but to be expected with the amount of heat/pressure. We have had temperatures in the 0 to 20 degree range and on the lowest setting it keeps our shop around 57 degrees. We could heat it up to 80 if we wanted to pretty quick, but are being conservative with the diesel fuel we are using to keep costs down.
I love this heater, use kerosene not diesel and there is hardly no smell, I use it in my attached garage to supplement my forced air propane and I can get the garage to 70 in about 15 min and I live in northern ny.
This heater heated my 30X50ft garage in the winterwith no problem. I burn #1 fuel oil in it and it does notgive off any odor.I like the idea of a built in thermostat and also a pumppressure gauge. It is a bit noisy and does like its fuelbut all in all I would recommend it to anyone.
We went through 2 heaters before we found this one, we will keep it! !
Good product. Only needed to run 3 hours on diesel when it got really cold. Puts out fumes but that was to be expected.We may try kerosene next winter, if we can find it!
Answer: The end glows red and you can't hold your hand 3-4 feet in front of it. I would say, at the heater 400 degrees. 10' away 95-100.