Originally Posted by Certifiable
If demand is high enough both boilers will run at once. The vast majority of the time only one runs.

They are not set up as a master/slave scenario and the only way to alternate which boiler carries the load is to change set points between the two

Get the engineer at the supply house to help run a load analysis. They have the software.

You'll need to be the feet on the ground, and get the pipe sizing and the specs on all equipment on that branch coming off the main.

This crap happens all the time in electrical, when someone "wants to add a circuit". In electric, you have a breaker that will trip.

With water, you get damaged parts as your "breaker".

"He is far from Stupid"

”person, who happens to have an above-average level of intelligence”


– DocRocket (In reference to ElkSlayer91)