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I just replaced my BG circulator pump with a Taco. The BG was the 100 series and the Taco I bought was the S10. I put the new pump in and filled the boiler and bled the radiators until water came out the valve. I start the boiler and the hot water is not being sent around the house. The feed line gets hot and there is a really loud banging noise coming from the steel tank up in the rafters. This is a mono flow with two 1 1/4 copper loops going around the basement. There are 1/2 inch pipes with mono flow tees (1 1/4 x 1 1/4 x 1/2) going to radiators on the 1st and 2nd floors. I did get water to each radiator. I tried bleeing air with a hose from the boiler drain near the bottom of the boiler, and it looked like the air was out. After running the boiler and trying to bleed will hot, it seems that steam is being sent out the hose.
What is causing the problem? Circulator pump not strong enough? I was told the scrap the BG and go with Taco. Should I get another BG instead of Taco? Is the boiler or a pipe clogged? If clogged how did the water get all the way to the radiators, even on the 2nd floor? Why is the boiler making steam? Is there air in boiler? There is no vent on boiler, only relief valve. I do not have picture of boiler, but is it an American Standard from 1956.