Troubleshooting Standard Gas Water Heaters

Pilot Won't Light

Make sure the gas supply valve has been turned on. Often something as simple as the gas being turned off can keep a new water heater from working. A newly installed gas water heater will have some air in the gas line. For this reason, it may take several attempts to light the pilot. Many times, the pilot will be lit, but it can be hard to see. Newer water heaters are more energy efficient and have much smaller pilot lights than older models.

Water Leaks

With a new water heater, most leaks are caused by leaking connections at the hot water outlet or cold water inlet. Occasionally, leaks can be found coming from a fitting (such as around the Temperature and Pressure Relief Valve) or around one of the heating elements. Leaking fittings can often be tightened or repaired. It is extremely rare for a new tank to leak.

The first time a new gas water heater is started, it will produce condensation. You may hear drips, or even a sizzling sound coming from the water heater. You may see a small puddle underneath. Condensation is caused by the cooling effect of a tank or cold water. Condensation is not a leak. Once the water heater reaches normal operating temperature, condensation will go away.

Water Drips

If drips are noticed coming from the discharge pipe of the Temperature and Pressure Relief Valve, the home's water pressure may be too high or a thermal expansion tank may be needed.

Water Pressure

Check your home's water pressure with a gauge. The recommended water pressure is 50 to 60 PSIG. If the pressure is higher than that, install a Pressure Regulating Valve (or adjust your existing pressure regulating valve if you have one). For water pressure issues, consult your local water utility or a qualified plumber.

Thermal Expansion Tank

When water is heated, it expands. In older homes, the expanded water pushed back into the water main. Today, most homes have backflow prevention valves which stop water in your home from reentering the water supply. These valves can be in water softeners, pressure regulating valves or the water meter itself. Backflow prevention valves (also known as "check valves" prevent the expanded water from reentering the water main. This causes the water pressure in the house's pipes to increase dramatically, often to the point where the Temperature and Pressure Relief Valve drips. For these reasons, most homes now need a thermal expansion tank and a properly adjusted pressure regulating valve