In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
The Riello burner is on a Buderus GE315-7 Boiler. 6 months ago I was called in to repair and get the unit running. I had to replace primary control, nozzle, and electrodes. I cleaned the turbulator disk along with everything else. Recently I got called back to clean and service the boiler again and as you can see from the picture the turbulator needed cleaning again. Can someone tell me what might be causing the carbon build-up and why mostly on one side of the disk?