No, it doesn't. The indoor loop can't get any hotter than the outdoor loop, and if you have a proper expansion tank on the indoor loop, you won't have issues with pressure. Turn your water temperature down on the outdoor loop, paying attention to what Loren says about making sure you don't turn it down too far, and that will help, and then cycle your indoor pump on a call for heat from the space, and that will help some more.
Bear in mind that your new boiler is probably rated at around 300,000 BTU, which is about three times bigger than most residences need. The manufacturer has its sequence engineered to maintain a fire continuously, so even at a smolder, your system is adding heat to the outdoor loop. In this kind of weather, that may indeed boil your "boiler," since it's open to atmosphere and water boils at 212 degrees at atmospheric pressure. If that happens, you're going to need a bypass in the house to keep from overheating the indoor loop. I know that many folks on this board are satisfied users of outdoor boilers, but I think they should be outlawed. The best of them is about 20% efficient, and the amount and toxicity of the pollution coming out the stack is literally breathtaking. If you have a nearby neighbor downwind, you're not doing him any favors.
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