Hi,
I think I have found what I am looking for:
4500 Watt Straight (LWD) Stainless Steel Heating Element
Camco 02929
The site link is:
http://www.theelectricbrewery.com/stain ... g-elements" onclick="window.open(this.href);return false;" rel="nofollow
Camco 02929: 4500W (240V), straight, low watt density (LWD), 10.375" long from flange base to tip (9.875" long from end of threads).
These new heating elements are the same, but now with a stainless steel base that will not rust so it is safe to leave water in your kettles for extended durations without using a magnesium anode. Straight (higher watt density) versions are also available for RIMS based setups, small kettles, or where ripple elements will not fit.
These heating elements include important features a brewer should look for:
UL listed for use in the US and Canada.
Ultra low watt density (ULWD) or low watt density (LWD).
A stainless steel base that will not rust.
Better sheath (tube) material made from a high performance nickel-chromium stainless steel (804) alloy with much better temperature and corrosion resistance than standard shiny 2xx/3xx stainless steel.
ULWD elements prevent the wort from being scorched or caramelized as the heat output is only 50W per square inch (7.8W per square cm) or less. ULWD also provides added safety as the element will not break instantaneously if fired "dry" (not immersed in water) by accident. Mistakes do happen so we recommend that ULWD elements be used whenever possible instead of LWD, especially when the element is in contact with wort. The high performance nickel-chromium 804 stainless steel alloy sheath (tube) used on these elements provides additional strength to resist dry firing.
Just sharing the details, it looks like these do not rust which is a good thing. only thing I wonder is this is not ULWD it is only LWD, but this is the only one thay can fit, and will need a controller to dial it down.