Water Heater Leak Repair in Denver, CO

The instinct when you find water around the heater is to assume the tank has gone. Sometimes it has. But in our experience a majority of "leaking water heater" calls turn out to be a component that costs a couple of hundred dollars to fix, and the tank has years left.

The six places a water heater leaks from

• The drain valve at the basePlastic drain valves warp and weep, especially after a flush. A brass replacement is inexpensive and permanent. Repairable.
• The T&P relief valve or its discharge pipeIf the valve is discharging, the tank is over-pressure or over-temperature — often because there is no working expansion tank. Repairable, and the cause needs fixing too.
• The cold inlet or hot outlet connectionsFlex connectors, unions and dielectric nipples corrode and loosen. Repairable.
• The heating element gaskets (electric)A weeping element flange leaves water down one side of the tank. Repairable.
• The anode rod portThread seepage after a rod change or from corrosion at the port. Usually repairable.
• The tank shell or a weld seamWater appearing from under the jacket or between the outer shell and insulation. Not repairable — the glass lining has failed and the steel has corroded through.

How to tell the difference yourself

Dry the area completely, put down paper towel or newspaper, and check again in two hours with the heater running normally. Where the paper wets first tells you a great deal:

• Wet only at the base, dry everywhere above: drain valve, element gasket or condensation.
• Wet running down the discharge pipe near the T&P valve: a relief valve issue — pressure, temperature or expansion.
• Wet at the top fittings: supply connections.
• Wet under the jacket with no identifiable source above: tank failure.

One more thing that fools people: condensation. In a cold Denver basement, a tank refilling with 42-degree winter water sweats heavily and drips onto the floor exactly like a leak. It usually stops once the tank is up to temperature. If the "leak" appears only after heavy hot-water use and disappears later, condensation is the likely answer.

Why relief valves start leaking

A T&P valve that weeps is almost always telling you something true about the system, not failing at random. The two common causes in Denver homes:

Thermal expansion with no outlet. If the house has a pressure-reducing valve or a backflow preventer on the service line — standard on most Denver Water connections — the plumbing is a closed system. Heated water expands, pressure spikes on every burner cycle, and the relief valve becomes the only escape. The fix is a correctly pre-charged expansion tank, not a new relief valve.

High static pressure. Some Denver neighborhoods sit in high-pressure zones. Over 80 psi, code requires a PRV. Every fixture, connector and appliance in the house lasts longer once it is installed.

Whatever you do, do not cap a discharging relief valve. It is the last-resort safety device on a pressure vessel holding 50 gallons of near-boiling water.

When the tank itself has failed

If the leak is coming from the vessel, there is no repair — the tank is a glass-lined steel cylinder and once corrosion breaches it, the hole only grows. Epoxy, welding and tank sealants are not options on a pressurized potable vessel.

What we do instead: contain it now, drain the tank safely so it stops feeding water into your floor, cap the lines if needed, and install a replacement — the same day where the size and fuel type are on our truck. We will also install a drain pan with a drain line if there is none, which is the difference between a leak and a flood next time.