What the law actually requires
NYC's Housing Maintenance Code requires building owners to provide tenants hot water 365 days a year, around the clock, at a constant minimum of 120°F at the tap. There is no “hot water season.” Heat is the seasonal requirement — hot water never goes off duty, in August as much as January.
The 120°F floor matters because “technically warm” is a real landlord move. Water that takes five minutes to arrive and never gets past tepid can still fall short of the requirement — HPD inspectors carry thermometers and measure at the tap. You don't need to cite code sections at anyone; you need to report accurately and let the inspection do the talking.
One nuance worth knowing: where a tub or shower has an anti-scald valve, that fixture is capped for safety, so the shower itself won't run hotter. That's scald protection at one fixture — not an excuse for lukewarm water across the apartment. We're summarizing the rules in plain English here, not quoting statute; the numbers to remember are simply: every day, 120 degrees.
First, rule out the small stuff
Before escalating, spend five minutes narrowing the problem. Run the hot side at every tap — kitchen, bathroom sink, tub. If only one fixture runs cold while the others run hot, the building's supply is fine and you're looking at that fixture's cartridge or mixing valve. That's a small repair, not a building failure, and in a rental it's still the landlord's repair to make.
If every tap is cold, find out whether it's just you. Ask a neighbor on your line — apartments stacked above and below you share risers — or the building group chat if one exists. Check the lobby and elevator for boiler-work notices. A whole-building outage with a posted notice and a crew in the basement is a different situation from a building that's gone quiet and cold with no explanation.
Note the pattern, because it's diagnostic. Cold only during the morning rush can mean a building system limping along, recovering too slowly for demand. Cold everywhere, all day, means the boiler or building water heater is down. Either way, write down when it started and what you observed — you're about to need those details.
Tell your landlord in writing — today
Report it the same day, and put it in writing. A call to the super gets the fastest action, so make the call — but follow it with a text or email to the super and the management office stating the facts: no hot water since when, which taps, your apartment number, your phone. Writing isn't about being adversarial; it's the record that everything later — HPD complaints, court proceedings — gets built on.
Give the building a real chance to fix it. Most outages are a part and a day, not a standoff. But “we're working on it” with no crew and no timeline doesn't pause your rights. Keep screenshots of every message and note every call. If days pass with no hot water and no credible progress, you've done your part, and it's time to escalate.
Escalate: 311 and HPD
Call 311, use the 311 app, or file online — hot water complaints route to HPD, the Department of Housing Preservation and Development. HPD contacts the building owner about the complaint, and if the problem isn't resolved, an inspector can come measure the water temperature at your tap. You'll need to provide access to your apartment for that inspection; an inspector who can't get in can't verify.
If the inspector confirms the condition, HPD issues a violation. Lack of hot water sits in the city's most serious violation class — the kind classified as immediately hazardous, with the shortest deadlines to correct. In stubborn cases the city can perform emergency repairs through its own program and bill the owner. None of this requires a lawyer. It requires the complaint, the access, and your records.
File once, then file again if it recurs — each complaint is a data point on the building's public record, and patterns are what move enforcement. Complaints also protect your neighbors: hot water failures are rarely one apartment's problem, and a riser's worth of complaints reads very differently to HPD than a single call.
When it's your equipment, not the building's
Everything above assumes a rental served by a building boiler. If you own — a condo, a co-op, a brownstone, a house — or your unit has its own water heater, the diagnosis changes. A water heater in your closet that's leaking, won't hold a pilot, trips its breaker, or simply predates your tenure isn't an HPD matter. It's your repair — or, in a condo or co-op, possibly the building's, depending on where the failure sits. Your bylaws or proprietary lease draw that line.
The telltale signs it's your heater: hot water fails only in your unit while neighbors are fine; the heater is visibly leaking or rumbling; the water runs rusty from the hot side only. Tank water heaters have finite lives, and the end usually announces itself this way. If that's where you are, our NYC water heater replacement guide covers tank vs. tankless, sizing, and why gas work requires a Licensed Master Plumber.
Renters whose units have their own heaters — common in small buildings and converted spaces — the appliance still belongs to the landlord, and so does the repair. Report it exactly as you would a boiler outage, in writing, and escalate through 311 the same way if it isn't fixed.
When to dispatch a plumber
Dispatch a plumber when the failed equipment is yours to fix: your house, your condo's in-unit heater, your co-op unit's equipment where the proprietary lease puts it on you. A licensed plumber can diagnose whether you're looking at a repairable part — a thermocouple, a heating element, a valve — or a replacement. And in NYC, anything involving gas must be handled by a Licensed Master Plumber with the proper filings.
Renters generally should not hire a plumber to work on a building's boiler or risers. You'd be paying for work on equipment you don't control, your plumber would need authorization and access the building won't grant, and reimbursement is a fight most leases don't support. Your leverage is the written record and HPD, not your wallet.
When it is your dispatch to make, Reset shows which licensed plumbers can move now, with price bands and trip fees published before you book, and every profile verified against the DOB roster. Emergency requests are backed by the Reset Guarantee: confirmed within 30 minutes, or Reset's in-house crew is dispatched automatically.