My house has a radiant heating boiler system which I will be removing. I am
beginning to drain the system and disassemble the unit. Since this is a
continuous system with three zones, there are no release valves anywhere
throughout the piping. Therefore, I wanted to ensure the proper method for
On the side of the boiler is a spigot which I know is the main draining
point. Though, I question the spigots located on three separate pipes, which
I assume is for each zone. Do I need to drain from them as well? Due to
suction/pressure in the system, I would think there may still be water even
after I drain the main spigot. Therefore, it appears logical to also drain
from the other three spigots.
Appreciate any help.
Here are photos of the spigots.
Main spigot on side of boiler >>>>
Three spigots and three zones >>>>
Closer view of the three spigots >>>>