When someone calls us about a leaking water heater, one of our first questions is always the same: gas or electric? It's not small talk — the two types share a lot of leak points, but each has its own weak spots and, more importantly, its own safety rules. Here's a plain-English tour of both, so you know what you're looking at down in the basement.
What they have in common
The fundamentals are identical: a steel tank, hot and cold connections up top, a T&P relief valve on the side, and a drain valve at the bottom. Fittings weep, drain valves fail, and T&P valves drip on both types for the same reasons. If your leak is at one of these shared points, the diagnosis looks the same regardless of what's heating the water.
Gas-specific: the combustion side
A gas heater adds a burner, a pilot or igniter, and a flue vent at the bottom and top. Leaks don't come from these parts directly, but they complicate everything around them: water dripping onto a burner assembly can snuff a pilot or foul the thermocouple, and any work near the unit starts with shutting off the gas. The other gas-specific concern is venting — the flue that carries combustion gases outside needs to be clear and drafting properly, which we check as part of any gas service. And the standing rule: if you ever smell gas (that rotten-egg odor), that's a gas-utility call first, not a water heater call.
Electric-specific: the hidden gaskets
Electric tanks have their own sneaky leak points: the heating elements. Each element threads into the tank side behind an insulated cover, sealed with a gasket. When a gasket weeps, water travels inside the jacket and can appear far from the source — sometimes at the base, a foot or two below the actual leak. These are the leaks that baffle people the longest, because everything visible looks dry. The safety rule here is absolute: power off at the breaker — not just the thermostat — before anyone works on or closely inspects the unit.
Which leaks more?
Honestly? Neither, in our experience. Tank failure from corrosion doesn't care what's heating the water, and valves and fittings fail at similar rates. The difference isn't frequency — it's where to look and how to stay safe while looking. That's why the gas-or-electric question matters so much on the phone: it tells us which checklist to bring down the stairs.
Know your type before you need to
Here's a small homework assignment: go look at your heater today, while nothing is wrong. Gas or electric? Where's the shutoff valve? Where's the breaker or gas control? Two minutes of familiarity now is worth a lot on the day you actually need it. And if something's already leaking, call (833) 713-2101 — tell us which type you have and we'll take it from there.