As you can see, its a pretty compact package. Cold air goes in one end and hot air comes out the other.
It puts out 7500 btuh on high but it doesn't run on high very long. It throttles back to low and you can't tell its on, its very quiet. It only uses a .03 gallons an hour of diesel on low. I have a two gallon tank in the tongue box that I filled it in the spring and we've only used about half of it.
Here it is with the case off, you can see the inside heat exchanger. Combustion air and gases are vented to the outside. The silver box in front is the electronic control unit. It meters the fuel and air in response to the temperature at the thermostat.
Here's all the crap I found inside, it was overdue for a cleaning and a new glowplug.
I've got it mounted under the bed. It blows on the floor in front of the bed so the floor and our shoes are toasty warm in the morning.
This is looking up at the floor of the trailer. Combustion air comes in the black tube and combustion gases are vented through the silver tube. You can just see the electric pump that pulls diesel from the tank and sends it to the heater. I was worried about having a glowing hot pipe under the trailer but the exhaust never gets so hot that it radiates heat.
They make a muffler for the exhaust. Its super quiet when its on low but it sounds like a mini jet when its firing up (pretty cool). Its mainly for the people around us as it never gets loud inside the trailer.
This is a perfect heater for us, its quiet, it slows down to a low setting instead of cycling on and off constantly like a propane heater, it only draws 0.8 amp-hrs on low and doesn't use much fuel. The bad side is they're spendy, can be finicky if installed incorrectly and spare parts keep getting more expensive. Luckily I've got a spare parts heater so hopefully it will last us awhile.
http://www.espar.com/documents/D1LCc.pdf
Bruce
They are a quality product. Kinda spendy but trouble free! Will