Yes, I’ve had people comment. Do you have power available at the campground? I run my furnace on shore power and electric if I can plug in. It’s just easier, and much quieter. A small electric heater can be another option. Having said that, I am not typically plugged in. I have an Espar hydronic with the Rixen H20 system. Yes it can be loud. So much so that people have mentioned it to me. I’ve serviced it often, and recently rebuilt it, replaced the muffler with a newer one (best I could get), and put the intake muffler on (not sure that one did anything), made sure it was well dampened from vibration (including the fuel pump) to avoid any vibration. It made a small change, but the jet engine noise as it starts up to cycle can certainly seem loud to others. We all (owners) get used to it. I snow camp up at the ski area through the winter, and the overnight RV’s get packed in. There is a curfew for generators (the big noise makers), but it’s the middle of the night jet engine sound as it starts up, that people have mentioned to me. Keep in mind, I’m less than 3 feet from others at times (we pack in like sardines). Many have propane and they are fairly quiet. I’ve thought about putting the second muffler on as a secondary damper, but these things are designed to run with a maximum length exhaust. Mine turns out towards the rear tire, and I would not want it under the van at all! With the high altitude fuel pump, it still blows smoke on start up with the cold. Mine has been serviced many times and works as it should. It’s just the altitude and cold that pushes it a little more. So the answer is, yes they make noise. You’ve got to stand outside on a quiet still night at 1am to understand how it sounds to others who don’t expect it. In the morning as people stir, it can hardly be heard. And once the generators start in the morning! Obviously this is convenient camping, vs a scenic camp ground - so they have to deal with the noise.