Heat and hot water
The radiator is quiet. The shower runs cold. You put a coat on inside your own home and still cannot get warm. If that is your week, you are not imagining it, and you are not the only one.
Say what is happening in ordinary words. Which room is cold. Whether the hot water is gone too. When it started, and whether you already told the owner. Add the address. You do not need legal language.
A draft can consider a letter to the owner, a 311 note, and an HPD package, and only from official files the service holds. This page names the problem. It does not decide that a rule was broken. You decide what to do next.