I know it's been hashed out many times before but, well, it's winter anyways. So, here you go. From what I remember the espar is a very solid choice. Looks like a D4 unit with marine kit is upwards of $1500. I noticed that Benjamin is running a webasto. Maybe some feedback and pics would help. How much burnt diesel smell does either choice inflict upon passengers inside the cabin? I understand that it will have to exhaust somewhere. Y'all know what boat I need to heat. I remember goat saying that it shall be plumbed such that it defrosts both sides...absolutely! After that I may want a couple of junctions/flappers whereby I can direct the warm air over towards chilly passengers. I think I know better than to ask if anyone has had good luck with the knockoff espar shit (china) you can get on amazon starting at $300. Even though I have read some good reviews this is going into my boat, so expense means nothing compared to piece of mind. Can anybody point me in a solid direction for which to spend my money?