If it were me, I would stop paying rent until the heating issue is fixed.
Tried both of these.
Finally wrote them a letter reminding them they had to heat the place or else I’d call the city, and the landlord’s response was quote “Why are you doing me like this?”
They evicted one guy who stopped paying his rent until it was fixed.
The other tenants are cold, too, but they’re afraid of eviction and need the place for the location. They also don’t know that they can have reliable heat from the boiler because they’re newer to the place.