I am purchasing a three unit apartment building that is going to need a lot of work. With winter approaching, I want to get the boiler working asap. It is a three zone gas powered boiler and it seems to be in great shape. However, some of the rooms are missing their radiators (they are the big old school cast iron ones). There are just pipes sticking out of the ground and the system is dry (whole house was winterized). What are some good options for replacing these? Is there a website or place that sells refurbished cast iron radiators, or larger aluminum ones that will put out the same heat. I am trying to avoid using the baseboard heaters that are sold at most hardware stores, because I would have to move the pipes around to fit them, and they don't put out nearly as much heat as the big cast iron radiators. Some of the shopping around I have been doing, hasn't been going well and prices are astronomical.

Hello. I live in a house with an 80% efficiency (210K/180K outp) Hydrotherm gas hot water boiler with 3 zones (basemt/1st/2nd fl). I'm guessing the boiler is circa 1965. Each zone is served by a separate circulator and each circulator has its own switching relay box, each hooked to its own thermostat. A few years ago I added a Tekmar 256 outdoor reset with BOILER_MIN =140, BOILER_DSGN =180. The aquastat is an L4062B with hi limit 180 / circ low limit 130. When I moved here, the boiler had B&G Series 100's on the 2nd floor and basement, and a taco 007 on the 1st floor. In 2008, I replaced the basement circ with a taco 007-F5 unit. As the remaining B&G 100 for the 2nd floor is showing its 1st signs of a small drip, I am wondering if it is worthwhile to consider either a taco 007 Delta T or an ECM Delta-T pump as a replacement, or should I stick to a regular single speed pump? I believe the 2nd floor heating zone has around 240 total feet of piping. Piping appears to be predominantly 1.25 inch copper (1 3/8 OD) fin tube. Heating season is around 6 months in NJ. I appreciate any advice.