Originally Posted by tjpolsin
Your low point drains should drain nearly all of the water out of your system - including the hot water tank.
- shut your water heater bypass valve
- open your water heater inlet and outlet valves.
- open both hot and cold low point drain valves.
- open all faucet valves, including outside shower (I remove the hose on mine)
- cycle the toliet valve to drain that line.
go inside and enjoy a cup of coffee while gravity does the work.
That's how I drain my system. Because of where I live, I blow my system down with compressed air (vice antifreeze) to winterize it.
- shut all faucets and low point drains.
- pressurize the system with 50# of compressed air (compressor or tire pump).
- open the water heater bypass valve. (allows compressed air from the water heater to blow the cold water lines).
- starting with the low point drains and working up, open one valve at a time until only air comes out.
- repressurize system to 50# as needed until all faucets and drains are just blowing air.