very interesting, my heating elements dont actually touch the mash. i also do not have control over the actual output of my elements. they are on or off. My system is 3 phase 400v which helps.I should have elaborated on this a bit more based on feedback from Blichmann/Anvil.
Particularly for the 220v Anvil kettles, you do not need, or want 100% power throughout the mash. When you're mashing up through ~ 158F, you can throttle the 'power' setting back to well under 50%. Anvil suggested 35-40, I use 45%. I've found that 35 creates a lot of up and down swings bigger than I like to see. at 45%, I may lose 2 or 3 degrees lifting the malt pipe to drain & stir, but it recovers in only a few minutes tops.
With high amounts of wheat or rye, you see quite a bit of scorching on the burner element at full power throughout the mash. This 'cakes' on to the element area and apparently retains heat, and when you roll into your mash out and boil, you'll end up with one or more e3 over temperature faults. The cleanup after a brewday like this is about twice as long.
Here is what has worked for me on the Anvil 18, likely the Anvil 10.5 is close and other electrics with adjustable power settings you would need to experiment with.
I pre-heat the Anvil with the built in timer function so I am ready to roll the next morning with mash in at pretty close to "strike temp". Stir, get rid of the 'dough balls' if any, install the diffuser, and start the recirculation. Set the flow and monitor, it usually has to be increased. Once it's stable, reduce the kettle power from 100% to about 45%. Leave the power alone until mash out. I find the Anvil cannot maintain temperature above about 160-165 at 45% power. I've experimented with lower than 100% but still get some fluxuation so for mash out at 170F, I set it to 100%.
I leave it set at 100% for sparging, and boiling. This is been successful for me, even brewing hefeweizen & roggenbier.
with burned on sugar, hot water/caustic helps alot. but you also need flow. you can "whirlpool" hot caustic which will make cleaning that stuff off much easier. PBW is good, but not as strong as sodium hydroxide.



