Water Heater · Service

Water heater failed? Stop the water first

Three shut-offs, in order, before you call anyone. Then the honest question almost nobody asks you at 10pm: does this actually need to be replaced tonight?

Get help now All water heater services

In short

What is emergency water heater replacement?

If a water heater is discharging water into your home, the priority is stopping the flow, not choosing an appliance. Close the cold water supply valve at the top of the tank — or the main shut-off if that valve will not move — then kill the fuel or power, gas at the valve or electric at the breaker, so the unit is not heating an emptying tank. Then, and only then, work out whether this is genuinely a tonight job. A contained leak with the water off usually is not, and one business day of patience typically buys you a better unit at a lower price.

Triggers

Signs you need emergency water heater replacement

Water is running or spraying from the tank rather than dripping, and it is not slowing
The tank has failed above a finished ceiling, in an attic, or anywhere the water is reaching another room
The pan under the unit is overflowing, or there is no pan at all
The relief valve is discharging continuously and the discharge line is hot
You can hear the burner or elements running while water is visibly escaping
The unit is in a garage or basement near stored belongings, an electrical panel, or a furnace
You have no hot water in freezing weather and there are vulnerable people in the house

Seeing something not on this list? Browse water heater problems by symptom →

The job

How emergency water heater replacement actually works

Close the cold supply, then cut the fuel or power

The cold inlet valve sits at the top of the tank on the cold side; closing it stops the tank refilling as it empties. If it is seized — and decade-old valves often are — go to the main shut-off for the house instead. Next, turn a gas unit's control to its off position and close the gas valve at the appliance; on an electric unit, switch the breaker off. An unattended unit heating a draining tank is the situation you are trying to end.

Watch for: Forcing a seized valve hard enough to snap it. If it will not turn with reasonable effort, leave it and use the main. A broken inlet valve turns a manageable leak into an uncontrolled one.
Limit the damage while you wait

Open a hot tap somewhere in the house to relieve pressure and let the tank drain down through it rather than through the failure. Move anything absorbent or valuable out of the water's path, get air moving over the wet area, and photograph everything before you clean up — wet cardboard and soaked drywall are much easier to claim for with pictures taken at the time.

Watch for: Draining a tank onto a finished floor with a garden hose that then siphons back. Route the hose to a drain or outside and confirm it is actually running downhill the whole way.
Decide honestly whether this is a tonight job

With the water off and the fuel isolated, an inert tank in a basement is no longer an emergency — it is an inconvenience. The genuine after-hours cases are water you cannot stop, active damage to finished space, and a gas smell. Everything else is a cold shower and a phone call in the morning.

Watch for: Being told that everything must happen tonight by the only company answering the phone at 11pm. That is the moment with the least competition and the least leverage you will ever have on this purchase.
If it is genuinely tonight, control what you can

Ask what unit is coming and what its capacity is before it arrives. Ask what the after-hours rate is and when it starts. Ask whether the permit is being pulled and when the inspection will happen — emergency work still gets inspected, and a permit skipped in a crisis is still an open problem at resale.

Watch for: Accepting whatever is on the truck. Emergency stock is whatever the company buys in volume, not what suits your house, and it can quietly lock you out of a type change you had been considering for years.
If it can wait, use the day properly

A single business day gets you two or three quotes, standard-rate labour, the unit you actually chose, and the option of a different type entirely. That is a large amount of value bought with one uncomfortable morning. Meanwhile the unit stays isolated and the house stays dry.

Watch for: Waiting without isolating. "It has mostly stopped" is not a plan — leave the supply closed and the power off until somebody has looked at it, however inconvenient that is.

Money

What does emergency water heater replacement cost?

After-hours and same-day replacements typically carry a premium over standard-rate work, often adding a few hundred dollars in labour on top of a normal installed price. Where the leak is contained and the water is off, waiting one business day usually removes that premium entirely. See the cost guide.

See the full emergency water heater replacement cost guide — by material, size and region →

Straight answer

When emergency water heater replacement is the wrong call

Everyone else ranking for this is paid when you say yes. Here's when you shouldn't.

The water is off and nothing is actively getting wet. An isolated tank is not an emergency. You are paying a night-rate premium for a cold shower you were going to have either way.
The leak turns out to be a fitting above the tank. A union, a relief valve or a drain valve is a repair, not a replacement — and paying emergency rates for a whole new appliance you did not need is the worst outcome on this page.
You wanted to change type and there is only one unit available tonight. If you had been considering tankless or a heat pump unit, an emergency swap forecloses that decision for the life of the new tank. If the situation allows waiting, wait.
The only failure is no hot water in mild weather. Uncomfortable, not urgent. Diagnose it at standard rates — a thermocouple or an element is a fraction of the cost of the emergency replacement being suggested.
You smell gas. This is not a plumbing call. Leave the building, then call your gas utility or emergency services from outside. Do not switch anything on or off on your way out, and do not wait for a contractor to arrive first.

Before you sign

What to check when hiring for emergency water heater replacement

What exactly is the after-hours rate, and from what hour does it apply?

Get the number before the van is dispatched. It is far harder to question once someone is standing in your basement at midnight.
What make, model and capacity is on the truck?

You are being offered stock, not a selection. Knowing what it is before it arrives is your only chance to say no.
Given the water is off, is there any real reason this cannot wait until morning?

Ask it plainly. A straight answer from someone whose revenue depends on the opposite tells you a great deal about who you are dealing with.
Are you pulling a permit for this, and when is the inspection?

Emergency work is still permitted work. A crisis is the most common excuse for skipping it and it is still your problem when you sell.
Will you document the failure and the water damage for my insurer?

Photographs of the failed unit and the affected area, taken before removal. Once the old tank is on the truck, that evidence is gone.
Is drying and cleanup part of this, or a separate trade?

Usually separate. Knowing that tonight prevents a wet subfloor being left under a shiny new heater.

All water heater hiring checklists →

Local pros

Emergency Water Heater Replacement near you

Local pro matching for emergency water heater replacement is rolling out by metro. Enter your ZIP and we'll match you with vetted pros in your area today.

Related work

Often done at the same time

Water Heater Repair

If it turns out to be a component

Water Heater Replacement

Planning it properly instead

Expansion Tank Installation

When pressure caused the failure

Water Heater Maintenance

So the next one gives warning

All water heater services →

FAQ

Emergency Water Heater Replacement — questions people ask

Still have a question? Talk to our team →

How do I stop a water heater that is flooding my house?

Close the cold water supply valve on top of the tank first — that stops it refilling. If the valve is seized, close the main shut-off for the whole house. Then shut off the fuel: turn a gas control to off and close the appliance gas valve, or switch off the breaker on an electric unit. Opening a hot tap afterwards relieves pressure and helps the tank drain somewhere you choose.

Is a leaking water heater an emergency?

It depends entirely on whether you can stop it and where the water is going. A tank leaking above a finished ceiling, or one you cannot isolate, is urgent. A drip into a floor drain in a basement, with the supply closed, is not — it is a job for tomorrow at a much better price. The distinction is worth about the size of the after-hours premium.

Can I just wait until morning?

Very often yes, and it is usually the better decision. With the water isolated and the power or gas off, the situation is stable. One business day gets you competitive quotes, standard-rate labour and the unit you actually want rather than the one on the truck. The cases that genuinely cannot wait are water you cannot stop, damage spreading into finished space, and any smell of gas.

Will my insurance cover the damage?

Policies differ substantially, particularly on whether they cover the failed appliance itself as opposed to the damage it caused, and on what they expect of you in terms of mitigation. Photograph everything before you clean up or let anyone remove the old unit, keep the invoices, and call your insurer early rather than after the work is finished.

Why is an emergency replacement more expensive?

Two reasons. The labour is charged at an out-of-hours rate, and you are buying from a market of one at a moment when you cannot compare. The appliance itself is not usually the premium — the callout and the timing are. That is precisely why establishing whether the situation can safely wait is the highest-value thing you can do in the first ten minutes.