Worst load/EDR mismatch I have ever seen. Boiler is a newer Crown 138kbh input/113kbh output. Good for about 354 sf EDR. It has 2146 sf EDR connected! The building is 2125 sq. ft., with a full basement. By the numbers, the boiler has enough capacity to heat the building. This is a two-pipe, pumped return system. When I first looked the place over, it seemed like a radiator warehouse, but I was called to get it warmed up. The system was flooded, so step 1 was to drain it to a manageable level. This took almost an hour. While waiting for the drain down, I took a look around. The 4" main was still in place, with a reducer to the 2", nipple-laden riser. Some of the nipples and fittings are galvanized! The traps have never heard the word "maintenance". Some radiators have SARCO traps, with no visible means of installation, other than threads. No unions, no spuds, anywhere close. I cannot figure out how they piped these radiators. The condensate tank had water up to the top of its vent pipe, so the condensate main had to be drained, too. The water meter on the feeder indicated 944 gallons. Ouch. Upon startup, the boiler ran out of water, so I added just a little, to keep it running. This cycle repeated itself several times, until the condensate made it back, which was about half an hour. This whole thing is in, you guessed it, a church. So which direction should I go next? I'm sure it needs trap work, and a boiler feed pump. Insulation on the mains would help, since there is none, currently. But, what about the boiler itself? Could I remove enough radiation to more closely match the boiler? Should I just tell them to bite the bullet, and get a correctly sized boiler? Hmm.