A garage within a small commercial building has radiant heat only. Since radiant heaters do not warm the air but rather only any physical object that is in the direct path of heat transfer, I've never relied upon them for maintaining correct temperature around a fire sprinkler system.
Have you used radiant heat to maintain temperature in a wet system? NFPA 13 (2016 Edition) 18.104.22.168.1 calls for temperature reliably maintained at or above 40 degrees F (4 deg C) for a wet system, which I would not believe would be the case for radiant heat.
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