Radiant Heating Flooring

I have an in floor radiant heat system using water that’s heated by a tankless water heater. However, there is also a PEX line running from the top of my main hot water heater/tank, which passes through a "Feed Water Pressure Regulator" with the arrow indicating the flow is toward the radiant system. This finally connects to the system just after the outlet from the tankless heater, after the circulator. Does anyone know what the purpose of this connection from the main household hot water tank would be?

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We have radiant heating (heated floors) all throughout my house. We have laminate, ceramic, Mohtashem carpeting in one of the bathrooms, and marble flooring. My mother says that if I turn the heat up more than ten degrees at a time, that the pipes will break through the floor. I have laminate wood flooring in my room, and beside my bed I notice that there’s a little upward bulge between a few lines. I’ve never noticed it before. Could this be from turning up the heating too fast?

Our house is 30 years old, and we can barely tolerate the electric baseboard heat. Radiant heat seems to be the best option. Can we convert the electric baseboard to electric radiant heat? Any forums or DIY info would be great! Thanks !

The house only has electric heat, and we don’t want to add gas eat to the equation at this point. Would electric radiant heat be a more efficient source of heat?

I’m an architecture student designing a dorm for the Cornell University campus in Ithaca, NY.

The school already has a geoexchange system that provides ground-temperature water to buildings. There is also a system that supplies buildings with steam. I’m attempting to implement in-floor radiant heating/cooling. I was wondering if there is a system that will convert steam to hot water, or use steam to heat the ground-temperature water that can then be fed through the floors. Any suggestions would be very helpful! Thanks!