In reading it looks like it is for homes newer than 1986? Our old water heater was 20 years old and we never had any issues with the pressure getting too high.
What’s an expansion tank? I set it up like the old one was set up. All I did was disconnect the old one and reconnect the new one to the same pipes coming out of the wall.
Unless this job is of personal significance for you (meaning it has the ability to advance your career in a significant way) then I would start shopping around again. But that’s just me.
