I feel your pain. Mr. Heaters are what I have in my drift boat and they don't last long. The finish is pretty cheasy. The drier I keep them, the less they rust. I Found that a boat cover on rainy nights on the Penninsula really helps.

I also found that my small propane tank doesn't seem to have enough pressure to make the regulator on the heater make any difference. The low/medium/high settings all seem the same. Anyone else seen this?