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Cast iron baseboard radiators do not cool off at the same rate within the same apartment
Hello, a plumber recently installed 9 cast iron baseboard radiators (9” tall) in the entire apartment, including bathrooms. This replaced copper baseboards. The new cast iron baseboard radiators heat up well when the thermostat turns on, about equally warming up in all rooms. However, once the radiators cool off, only 4 out of 9 keep the heat for a long time while 5 cool off much sooner than others. The ones that cool off sooner are located BOTH on internal and external walls, so my theory about external walls being cooler is out the window. Note that the smallest of the radiators, in the bathrooms, 1.5’ length, stay warm the longest. In the bedroom, one of the 3’ radiators on an internal wall stays warm for a long time while the another 3' radiator in the same room on another internal wall cools off much faster. This particular room may have one radiator much earlier on the supply than the other one, though…Is there a reason why this uneven cooling takes place? I would hope they all have consistent characteristics, given they are all the same brand, OCS Industries. Any ideas would be appreciated. Thank you.