How to adjust aqua stat?
There are many different types of aquastats, but most have a temp.dial on them with an adjusting wheel. Some are clamped on the surface of the pipe, some are in an immersion well plumbed into the piping system, and some are integrated into the main control. Some boilers have aquastats and high limits. Usually, an aquastat is set to around 180 degrees and high limits to 200 degrees. Look around the boiler and I bet you will find them! Also, make sure the temp. guage is accurate. IF it is saying 220 deg., make sure it is actually 220 deg. Good luck!! Hope this helps!