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What to Do If Your Water Heater Leaks
A leaking water heater is easy to miss until it is not. The heater sits in a corner of the basement or utility room, out of sight, and a slow leak can run for days before the puddle spreads far enough to notice. When it is noticed, the first question is usually whether the heater is failing or whether something simpler is going on, and the honest answer is that a leak can point to several different things.
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This guide covers what to do first when your water heater leaks, what a leak may point to in general terms, and when to call a professional. The steps are the same ones that apply to any water loss: safety first, stop the water if you can do so safely, and get help for the rest.
What to do first
The first step is to stop the water reaching the heater, in general terms. If the heater has a shut-off valve on its cold water supply line, turning that off will stop water flowing into the tank. If there is no valve, or you cannot find it, the main house shut-off will do the same job. Only do this if you can reach the valve from a dry place. If the floor around the heater is covered in water, stay out and call for help instead.
Do not touch the heater itself if it is sitting in water, and do not touch any electrical connections near it. If the heater is electric, water and electrics are a dangerous combination, and if it is gas, the burner area and controls should be left alone too. Move belongings away from the water where it is safe to reach them, and take a photo of the leak and the water it has spread. The water damage restoration page covers what happens once a professional arrives.
What a leak may point to
A water heater leak can come from several places, and where the water is coming from says something about what is wrong. Water at the base of the tank often points to the tank itself, which can corrode over time, and a tank that has corroded through is usually at the end of its life. Water at a connection, where a pipe meets the tank, may point to a fitting or a valve that has worked loose or worn out, and that is a different kind of problem.
Water from the pressure relief valve, the small valve on the side or top of the tank with a pipe running down from it, can mean the pressure or temperature inside the tank is too high, and that is worth taking seriously rather than ignoring. Water from the drain valve at the bottom may mean the valve itself has failed. These are general pointers only, and working out which one applies is a job for someone who can look at the heater properly. Do not open the heater or adjust its controls to investigate.
How much damage a heater leak can do
A water heater holds a large volume of water, and even a slow leak adds up over days. A tank that leaks a little each hour can soak the floor around it, wick into the wall behind it, and spread under flooring into the next room. Because heaters often sit in basements, and basements are common in New Jersey, a heater leak is one of the more common causes of basement water damage in the state, and it is often found only when the water has spread well beyond the heater itself.
The damage is not just the water on the floor. Moisture that soaks into a wall or a floor and stays there can lead to further damage and to mold growth in general terms, and that is why a heater leak deserves the same drying treatment as any other water loss, even if the puddle looked small. Homeowners in Camden and elsewhere who find a leak should treat it as a water loss first and a heater problem second, because the water is what damages the house.
When to call a professional
Call a professional when the leak is more than a drip you can trace to a single loose fitting, when the floor around the heater is wet, or when you cannot tell where the water is coming from. A professional visit covers the water damage first, the removal and drying, and the heater is looked at as part of the same visit. If the heater itself needs replacing, that is a separate decision, and it is worth getting advice on rather than rushing.
Do not keep running a leaking heater while you wait for help. Shut the water off if you safely can, and leave the heater alone. If the heater is making unusual noises, if the water coming out of it is discoloured, or if there is any smell of gas, leave the house and call for help from outside. A leaking heater is a common problem, but it is not a problem to live with while you think about it.
Preventing the next heater leak
A water heater does not last forever, and age is the biggest factor in whether it leaks. Most heaters give warning signs before they fail: rust-coloured water, rumbling or popping sounds when the heater runs, water that is not as hot as it used to be, or damp around the base that comes and goes. Noticing those signs early is worth more than any repair after the fact, because a heater replaced on your schedule is far less disruptive than one that fails on its own.
A regular look at the heater, once a month, takes a minute: check the floor around it, look at the connections, and note any change. If the heater is in a basement, put that check together with a general look at the basement walls and floor. The emergency water removal page covers what happens when a heater leak has already spread water across a floor. A minute a month is a small price for catching a leak before it becomes a flood.
How a heater leak affects the rooms around it
A water heater leak does not stay in the room with the heater. The water runs across the floor, under skirting boards, and through gaps into the rooms next door, and it seeps down through the floor to the room below. Because heaters often sit in basements, and basements are common in New Jersey, a heater leak is one of the more common causes of basement water damage in the state, and it is often found only when the water has spread well beyond the heater itself. The rooms around the heater deserve the same attention as the heater itself, and the inspection should check them, not just the floor the heater sits on.
That spread is why a heater leak deserves the same drying treatment as any other water loss, even if the puddle looked small. Moisture that soaks into a wall or a floor and stays there can lead to further damage and to mold growth in general terms, and that is a problem that shows up weeks later, as a smell, a stain, or a floor that starts to warp. If you find a heater leak, ask for moisture checks in the rooms around it, and in the room below if the heater is upstairs, because the water that matters is often the water you cannot see.
Key Takeaways
- The first step is to stop the water reaching the heater, in general terms.
- A water heater leak can come from several places, and where the water is coming from says something about what is wrong.
- A water heater holds a large volume of water, and even a slow leak adds up over days.
- Call a professional when the leak is more than a drip you can trace to a single loose fitting, when the floor around the heater is wet, or when you cannot tell where the water is coming from.
- A water heater does not last forever, and age is the biggest factor in whether it leaks.
- A water heater leak does not stay in the room with the heater.
Your Next Step
If this guide matches what you found at home, the next step is a visit — not a guess. Call and describe what you found, and the visit is arranged from what you describe. The Water Damage Restoration page explains what that service covers, and the structural drying page explains how drying works after the water is removed.
Do not enter a flooded room, do not touch electrics in or near standing water, and do not try to clean up sewage yourself — sewage is Category 3 black water and a health hazard.
Keep the guides on this site bookmarked: the first guide, the signs guide, and the preparation guide cover the checks worth repeating — after a leak, a flood, or a burst pipe.
Water Damage Restoration help is available across New Jersey. See water-damage-restoration in Ledgewood, NJ for one local example, or find your town on the service areas page.
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