Mark, It probably doesn't help if you over fill the tank and the honey goes in the fill spout. I think my newer tank is 22 years old.
I have one of my Dad's tanks that we used to melt up over 11 tons of beeswax in 2012. Used that same tank the last two months to heat 18 tons of syrup for spraying into frames for 2013 new hives. Just finished processing 2 1/2 tons of honey today to ship out next week. Start melting wax again next week.

Really if the tanks aren't heating something, your not making money with them.

I don't know if Maxant would recommend this for there tanks, but I'm looking to add a second 220 element to my main tank to get more output.