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I live in a 2 family (phily style) in the Boston area. This summer had the house insulated, new windows and a new oil fired boiler installed. Have one pipe steam. Before the new boiler was installed the house heated pretty evenly. When the new boiler was being put in the plumber showed me how clogged up the old pipes coming off the bottom of the old boiler were, at least 2/3 full of crud.
The boiler runs well but I have a few radiators that take awhile to get hot. I have skimmed the boiler a couple of times and drained the hartford loop once until it ran clear. After looking at the piping carefully I saw that there are two loops that supply steam to the radiators. The short loop (aprox 30') feeds the bathroom radiator (small), 1st floor bedroom radiator (large), small 2nd floor bedroom, and kitchen.
The long loop (aprox 84') feeds the other 2nd floor bedroom, the front hall, living room, and dinning room. It is the hall, living room and dining room that take awhile to get hot. They are all large radiators, 12,13 &14 section rads that measure 8"X 20" tall by 28"to 34" long. The thermostat is in the dining room which is open to the living room.
Here is where it gets advanced. I have put a Gorton #1 main on the end of the short loop and Gorton #4's on all the rads coming off that loop. The long loop has a Gorton #2 at the end of the main. The 2nd floor bed room has Gorton #6 and is doing well. The hall, living room and dining room have Gorton D on each radiator. All of this was done after the new boiler was installed in an attempt to balance the system a bit better. It did help but the three rads in question still take at least 20 minutes longer than the rest of the house to get hot.
So what else can I do?
As an aside how often should the boiler be drained and when should I add more water back? Fill it when it's cold, when it starts up or while its running? I know that adding water frequently puts a lot of minerals and oxygen into the system. Are there additives to help reduce corrosion or should I not bother with that on a new boiler.
I have included some pics for clarification.
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