When I blow out my lines, I open all the bypass valves, to ensure no water is trapped behind a valve. With some of the new TT’s with the three way valves you may have to turn the valve 45 degrees or flip it back and forth to ensure the water can escape. I start with the water heater drain closed, pressurize the system (<40 psi), and then go through and open the various faucets, and low point drains. I have replaced my water heater drain plug with a valve, so while the system is still pressurized, I will open the drain valve and force the little bit of water out of the tank.
I also use antifreeze, to ensure there is no low spot that might accumulate any remaining water, so I will bypass off the water heater and fill the system with antifreeze, then blow out the antifreeze. It does take a few extra minutes but I am confident that there is no risk of broken fittings in the spring.
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