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    Well, if the air is trapped in the radiator (like at the top), then it does not circulate. Commented Jan 10, 2023 at 17:53
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    @SteveSh makes an excellent point. Typically air in a system is localized at the top of any given radiator - not traveling through the system. Every bleed valve I've seen is at the top of a radiator for that reason. So if 25% of a radiator's volume is air you're losing about 25% of heating effectiveness in that room. Commented Jan 10, 2023 at 20:52
  • @SteveSh Precisely - which is why you have to bleed every rad, not just one. Commented Jan 11, 2023 at 8:16
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    If 625 units go "into the system" then where do the other 375 go??? Commented Jan 11, 2023 at 8:18
  • @SteveSh sounds like you just corroborated both of my points... Commented Jan 11, 2023 at 21:52