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Heat takes a long time to reach some radiators in a hot water system
I have a 3 family house (3 stories) with an oil fired, hot water system with a single zone. I have a circulator pump, but one particular stack of radiators (1 cast iron radiator on each floor all fed off the same risers) takes forever to get hot. When i turned the system on last month, i kicked the heat up to 80 while bleeding the radiators in the entire house. Most radiators required very little bleeding to get hot water. However, this one stack of radiators all needed to be bled for about 20 minutes each before getting hot water. These 3 radiators used to work great but as of last year started to have issues. I'm wondering if perhaps my circulator pump is on its way out or if i need to add an additional circulator pump on this one particular stack. There are no leaks in the system at all and all risers are exposed as they pass between floors. Any advice would be greatly appreciated.