The Kuuma 6 gallon water heater has a leak and likely needs to be replaced. The unit is 10 years old. (Apparently the PO changed it out after 5 years.) Kuuma brands run about $275 and similar models from Seaward Marine run about $475. Anyone have any experience with this and good explanation for price difference? I can not find out what was OEM equipment in 2005. Thanks!