Hot water, running continuously, into the finished side of a basement, usually found long after it started. Free inspection with moisture readings across Macomb and Oakland County.
This guide is published by Prime Restoration, a Michigan licensed residential builder and water damage restoration contractor in Sterling Heights. Replacing a water heater is a licensed plumbing trade and we do not perform it — we handle what the water did. Written for Macomb and Oakland County. Last updated 2026-07-31.
The thing nobody writes down
Everyone worries about the tank splitting open. That is the rare version, and it is usually the cheaper one, because eighty gallons on the floor gets found in about four minutes.
The expensive version is the tank that weeps from the bottom seam for weeks while the burner keeps firing. Three things make that materially worse than a pipe failure. The water is hot, so it drives into porous material faster and lifts humidity in a closed basement. It does not stop, because there is a supply line refilling the reservoir behind it. And it is quiet, in a utility corner, next to whatever the household stores on the floor.
By the time somebody notices the puddle keeps coming back, the subfloor, the bottom plate and the cardboard have been wet for a month. On wet porous material, growth can begin in roughly 24 to 48 hours. That is the whole reason this loss so often turns into a mould job rather than a dry-out.
The sixty-second check worth doing today
Find the label on your tank and read its age. Most residential water heaters are engineered for roughly eight to twelve years, and the ones that fail early are overwhelmingly the ones whose anode rod was never inspected in a hard-water area — which is most of Southeast Michigan. Then look at the base of the tank for moisture that returns after you wipe it, and run a hot tap for rust colour. A tank past twelve years sitting on the finished side of a basement is a scheduled replacement. Treating it as one is far cheaper than treating it as an emergency.
The dramatic one is fourth on this list by total damage. The one at the top is the one that quietly builds the biggest bill.
| Failure mode | How it shows up | The water | How long it runs | What it means for scope |
|---|---|---|---|---|
| Tank corrosion at the bottom seam | A slow puddle that reappears after you mop it. Often rust-stained. | Hot, and continuous — the burner keeps refilling and reheating it | Weeks to months before it opens up | The worst case, because it has been quietly wetting subfloor, drywall and stored contents the whole time. |
| T&P relief valve discharge | Water at the end of the discharge pipe, sometimes hot enough to steam | Hot, intermittent, in bursts | Can run for months unnoticed if the pipe drains to a floor drain | Usually contained if it is piped correctly. If it is not piped to a drain, it is a full floor loss. |
| Drain valve or fitting weep | A wet ring at the base, dry higher up | Hot, slow, constant | Indefinite. This is the one people live with. | Small if caught. It is also the most common source of the hidden mould we find under adjacent flooring. |
| Supply or flex connector failure | Spray or drip at the top connections rather than the base | Cold on the inlet, hot on the outlet | Sudden | Often the cleanest version. Sudden, obvious, and shut off quickly. |
| Full tank rupture | Forty to eighty gallons on the floor at once | Hot, then whatever the line keeps feeding until the supply is closed | Minutes | Dramatic, but frequently less total damage than the slow weep, because it gets found immediately. |
The valve on the cold inlet at the top of the heater. This is the one action that changes the size of the job, because it stops the reservoir refilling.
Gas valve off, or the breaker for an electric unit. A tank that keeps firing on a low water level is its own hazard.
The base of the tank, the puddle line, any rust staining, and the contents that were sitting in it. Timestamped. Two minutes, and it is the record everything else rests on.
Cardboard and textiles wick fast and are usually what turns a small loss into a contents claim. Lift what is safe to lift; do not start pulling carpet.
Standing water out, then readings on slab, bottom plate, framing and any finished surface, measured against a dry standard from an unaffected area.
Air movers and LGR dehumidifiers held until readings hit dry standard, with daily logs. If the tank ran for weeks, the cavity gets opened and checked rather than assumed.
The honest part
Installing or repairing a water heater is a licensed plumbing trade in Michigan and we are not it. If your tank has failed you need a plumber, and if water is still running you need them before you need us. What we do is the part after: extraction, finding how far the water actually travelled, drying the structure to a documented standard, remediating growth if it has started, and rebuilding what came out. Plenty of these jobs need both trades in that order. If what you describe is a plumbing problem with a dry basement, we will tell you to call a plumber and we will not send a truck.
The water can wait. What it is doing to the room cannot. A tank weeping from the bottom is putting hot water onto a floor continuously, because the burner or element keeps refilling and reheating it, and hot water moves into porous material faster than cold. On wet porous building material, microbial growth can begin in roughly 24 to 48 hours. Over a weekend that is a materially different job than it is on Friday. If the leak is at the base of the tank rather than a fitting up top, close the cold supply valve above the heater and shut off the gas or breaker, then deal with the water.
Three reasons, and they compound. First, it is hot, which drives moisture into materials faster and raises humidity in an enclosed basement. Second, it does not stop, because the tank keeps refilling from the supply line, so unlike a pipe that empties, this one has a reservoir behind it. Third, and most importantly, it is usually slow and quiet, so it runs for weeks before anyone notices, in a room where people store cardboard on the floor. A burst pipe is a bad hour. A weeping tank is a bad month that nobody clocked.
Check its age first, on the label or the serial number. Most residential tanks are engineered for roughly eight to twelve years, and the ones that fail early are usually the ones with an anode rod that was never inspected in a hard-water area, which is most of Southeast Michigan. Beyond age, the signals worth acting on are rust-coloured water at a hot tap, sediment noise on heating, a metallic or rusty smell, and any moisture at the base of the tank that returns after you mop it. A tank past twelve years in a finished basement is a scheduled replacement, not an emergency waiting to happen.
If water is still coming out, you need whoever stops it, and for a failed heater that is a licensed plumber. Replacing or repairing a water heater is a plumbing trade and we do not perform it. What we handle is everything the water already did: extraction, moisture mapping, structural drying, removal of material that cannot be dried, and rebuild. Many of these jobs need both trades and the sequence matters, plumber first. If you describe the situation on the phone we will tell you honestly which one you need, and if the answer is only a plumber, we will say so.
It depends on the readings, not on the waterline. The predictable removals are carpet pad and tack strip, which almost never survive, and the bottom courses of drywall if the water wicked up, which it does readily in the first hour. Base trim usually comes off to open the cavity. Anything porous that was sitting on the floor — cardboard, stored textiles, particle-board furniture — is generally a loss. What is often saved is the carpet itself, the framing, and engineered or solid flooring if we get to it fast enough. The variable that decides most of it is how many days it ran before you found it.
The distinction that matters on a standard Michigan HO-3 is sudden and accidental versus gradual. A tank that ruptured is typically treated as sudden and accidental, and the resulting water damage is usually addressed. A tank that had been weeping for months, where there is rust staining and a documented history, is more often treated as gradual deterioration and excluded as a maintenance issue. Note also that the heater itself and the resulting damage are treated differently in most policies. Coverage determinations, payment decisions and settlement amounts are made solely by your insurance carrier after their own inspection. What we control is a clean record of the cause and the timeline.
The inspection and the written scope are free, and a real figure comes from moisture readings rather than a phone description. The range is driven by how long it ran and how much of the room was finished. A tank caught the day it started, on a concrete floor in an unfinished utility area, is at the low end and often needs little more than extraction and a few days of drying. A tank that ran for weeks into a finished basement with carpet, drywall and stored contents is a much larger job, and if growth has started it becomes a remediation on top of a dry-out. Anyone quoting a firm number before seeing readings is guessing.
Sources
Failure modes, service-life ranges and anode-rod behaviour reflect standard residential water-heater construction and the conditions common to hard-water areas of Southeast Michigan. Water categories, growth timing and structural drying practice follow the restoration industry standard. Service-life figures are typical engineering ranges, not a warranty or a prediction for any specific unit. No customer, address or job is described anywhere on this page. Plumbing scope is described so you can identify it, not so we can sell it, because we are not licensed to perform it. Prime Restoration publishes this page and no company paid to be referenced on it.
Free inspection with moisture readings and a written scope. If the readings come back dry, we will tell you that and leave.
Call (586) 277-1069Prime Restoration is a Michigan licensed residential builder (#262500491) and a water damage restoration contractor. We do not perform plumbing work and nothing on this page is an offer to install, repair or replace a water heater; that requires a separately licensed contractor. Nothing here is legal, insurance, plumbing or engineering advice. Coverage determinations, payment decisions and settlement amounts are made solely by your insurance carrier after their own inspection. Scope and cost are set from actual moisture readings and affected square footage.