Based on hunting around for Limelife elements on Camco's site, and assuming it's either a 11 or 13" element, (because it says minimum tank diameter 14", and they always leave at least 1" of space between element end and tank wall), it's either a 2500W or 3500W 240V element. At 120V, this translates to 625 or 875W. If it's the 14" 4500W 240V element, then it's gonna be 1125W at 120V. If it's the 14" 5500W 240V element, then it's gonna be 1375W at 120V. Camco only has 240V elements in foldback incoloy elements listed on their website, so it has to be one of those three, ASSUMING camco's website is up to date, and honestly it looks pretty sh!tty.
Edit, nevermind, found one 120V incoloy element...a 12" one rated at 1500W at 120V.