Maybe a steam table element: all stainless, includes mounting hardware and electrical box, about $60 on ebay 4-7 kw @ 208v.
http://www.ebay.com/itm/Electric-Water-Immersion-Heating-Element-Stainless-Steel-5-000W-208V-Steam-Table-/181463987416?pt=LH_DefaultDomain_0&hash=item2a4018b4d8
Or...