I need to flush out my boiler, is there anything major I need to know, other then shut the system off... Thank you for the help Stan

I hope you['re talking about a water heater and not a heating unit.
For long life and fewer troubles you should keep your heater clear of mineral build-up by flushing on a regular schedule. Attach a hose to the boiler drain at the bottom of the tank. With the pressure on, open the boiler drain and let it run until the water runs clear. You will see a spurt of red,(rust) followed by white or yellow grains,(lime or calcium carbonate). This shouldn't take more then a few minutes. Do this monthly to keep it clear. Now flush out your hot water lines on ALL fixtures that are affected . Now pull each aerator and clean the screens. Be sure you put them back togather the same way you took them out. Don't forget to flush it out every month. Your heater will thank you for it. Hope this helps, Tom

My furnace also heats the hot water... I'm having very low hot water psi in all area's of my house. I had a repair person there about 6 months ago, for some other issue and I had low psi then. The repair person drained somethging. After that the hot water psi was like new, and slowly slowed down. Trying to save some $$$ I was doing some research it seem that the issue is on the hot water side. Cold water and the well are fine... Any other ideas's I would be happy to listen..

The same flushing procedure should apply to your boiler as to a water heater.
Good luck, Tom

Flushing Your Boiler Has Nothing To Do With Your Hot Water Pressure. However Make Sure You Never Add Cold Water To A Hot Boiler, Check To Be Sure You Have A Hot Water Feed If You Try. Your Bad Pressure May Come From Your Hot Water Jacket Inside The Furnace Being Obstructed And Needs To Be Back Flushed. Dissconnect Your Feed And Your Discharge, Hook Up A Hose And Back Flush But Check Your Feed First, See How The Pressure Is Before It Enters Your Heating Jacket