Hi need to install the large gasket on the front of the boiler and the altimeter gage, also the pressure relieve valve seems to be stuck
how do i drain enaugh fluid to install these items?
will it go into a vacum to do this when opening the drain valve
the system is 13 years old and has antifreeze put in when new
what type ,I do not know
I like to up date the system and bring it up to date
I only use the oil burner as a back up
I now have a 10 K solar system and a AC/Heat pump since early this year