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Hot Water Heat with cold rooms furthest from the boiler
I have a slant fin hot water heating system in a two story brick home. Each radiator has a supply and a return coming off of a main. The two rear bedrooms, one on the first floor and the one directly above it are always colder than the other two bedrooms directly next to them.The rest of the house is warm. All of these rear bedrooms get the same amount of sun exposure and have two exposed walls each. I measured the temperature at the radiator in the chilly room at 125 degrees and in the warm room next to it at 150 degrees. I bled all the radiators prior to putting on the boiler and drained the expansion tank. My oil company wants to replace the slant fins with cast iron Burnhams to give a larger heating surface. If the temperature is the problem, then the size of the radiator wont make a difference. The boiler mechanic already boosted the circulation at the boiler last year, but that didn't help. The chilly room measures 11'6" x 9'10" with an 8' ceiling. The radiator measures 40"L x 6"W x 2"H. The warm room next to it measures 12'8" x 12'8" with an 8' ceiling. The radiator measures 44"L x 6"W x 2"H.