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Near boiler piping of Condensing Boilers

Do Condensing boilers pump away or into the boiler?
Does it depend on the manufacturer? I'm guessing the lower temps leaving the boiler do not cause the same issues relating to Henry's Law that non-condensing boilers have. However, why would they be piped with the circulator on the return?
Just trying to understand the theory because someone told me that Lochinvar condensing boilers suggest that.
Does it depend on the manufacturer? I'm guessing the lower temps leaving the boiler do not cause the same issues relating to Henry's Law that non-condensing boilers have. However, why would they be piped with the circulator on the return?
Just trying to understand the theory because someone told me that Lochinvar condensing boilers suggest that.
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Comments
I understand everything but the last sentence regarding the relief valve setting. Can you please explain running the system closer to the relief valve setting? When you prevent adding pump pressure to static pressure, are you trying to keep the pressure low? Aren't you trying to keep the pressure away from the relief valve setting?