None here either, that's how I have mine plumbed, about 1/2 way down the length of the trailer, to get heat to the rear. Fans should push enough heat. All I would add is that maybe use galvanized or something for the first few feet. I tried the white ABS sewer pipe before and it discoloured pink and reddish brown (like to the point it made me concerned that it couldn't handle the heat). Good practice is also to leave a small air gap between the wall and the pipe in the first few feet, just to avoid direct contact to the wall. I've got 1/4" and it seems OK, wall doesn't seem to get hot.
Yes, my heater is mounted on a stand
I think I'm going to order one and install it in the hunting camper. Take some load off the forced air furnaces.
There has got to be a way to insulate it further to deaden the sound of the pump. Can't be any louder than a forced air furnace
