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5Well, if the air is trapped in the radiator (like at the top), then it does not circulate.SteveSh– SteveSh2023-01-10 17:53:46 +00:00Commented Jan 10, 2023 at 17:53
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1@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.HoneyDo– HoneyDo2023-01-10 20:52:28 +00:00Commented Jan 10, 2023 at 20:52
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@SteveSh Precisely - which is why you have to bleed every rad, not just one.MikeB– MikeB2023-01-11 08:16:38 +00:00Commented Jan 11, 2023 at 8:16
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3If 625 units go "into the system" then where do the other 375 go???MikeB– MikeB2023-01-11 08:18:04 +00:00Commented Jan 11, 2023 at 8:18
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@SteveSh sounds like you just corroborated both of my points...Huesmann– Huesmann2023-01-11 21:52:47 +00:00Commented Jan 11, 2023 at 21:52
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