Will this pump replace a Bell and Gossett seeries 100?

Hello - Dimensionally it is a direct fit replacement for the B&G 100. They both have the universal 6-3/8” flange to flange dimension and standard bolt pattern. However, the performance curves are much different. The 0015e max flow is 16 gpm and the B&G 100 max flow is about 30 gpm. But in reality, the 100 series is vastly oversized for most systems. Most homes don’t require flow more than 10 gpm (100,000 BTU) for the entire system. If the B&G 100 is a zone pump, it needs even less flow for each zone. So the 0015e3 will be more than adequate for most residential systems currently using a B&G 100.