If I have no heat in my rental can I be made to wait several days for a repair?

Question Details:

I'm renting an apartment in Park City, UT. My water heater went out this afternoon which controls my water heat, but heats my apartment also. I called maintenance and they said my water heater is new and still under warranty but the plumber will not come out until Monday. They told us to just use our gas fireplace and space heater until then. Now we have no hot water and limited heat and it's Saturday night and 24 degrees outside. Is it legal for them to make us wait this long to get our water heater repaired?

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