Where the Drain Valve Is and What It Does
The drain valve is the spigot near the bottom of your water heater, often with a handle or a knob and a threaded outlet for a garden hose. Its purpose is to let you drain the tank for maintenance, flushing out sediment, or removing the unit. Because it sits at the lowest point, any drip from it pools right at the base — which can look alarming even when the fix is simple.
Many tanks come with an inexpensive plastic drain valve from the factory. These are functional but more prone to weeping over time than a brass replacement, especially after they have been opened to flush the tank.
Why the Drain Valve Leaks
It was not fully closed. The most common and easiest cause — the handle was bumped or left slightly open after a flush. Closing it firmly may stop the drip entirely.
Sediment is holding it open. Greater Vancouver's water leaves mineral sediment in the tank base over the years. When you open the valve to flush, grit can lodge in the seat and prevent it from sealing fully when you close it again. A brief, careful re-flush sometimes clears the debris.
A worn washer or seal. Like any valve, the internal washer degrades with age and can no longer seat tightly.
A cracked plastic valve. Plastic valves become brittle with heat and age. Once cracked, they cannot be resealed and must be replaced — ideally with a brass valve that lasts longer.
The Fix and Two Quick Things to Try First
Before calling anyone, try two simple steps. First, make sure the valve is fully closed — turn the handle firmly to the off position and watch for a minute. Second, if it still drips and you are comfortable doing so, place a bucket beneath it, briefly open the valve to flush out any trapped sediment, then close it firmly again. Trapped grit is a surprisingly frequent cause.
If the valve still weeps, the internal seal or the valve body has failed. The proper fix is replacing the drain valve — often upgrading a brittle plastic unit to brass. This is straightforward for a technician but does involve partially draining the tank and isolating the supply, so it is worth having done correctly to avoid a bigger leak. CanroHeat handles this routinely on tank water heaters.
A quick word of caution on the flush itself: if your tank has not been drained in many years, opening the drain valve can sometimes make a marginal valve worse, because long-settled sediment shifts and lodges in the seat. On an older tank in Greater Vancouver's mineral-bearing water, it is often wiser to have the flush and valve service done together by a technician who can isolate the supply first — rather than risk turning a minor drip into a stuck-open valve you cannot close.
When to Call CanroHeat
Call if the valve keeps dripping after you have closed and flushed it, if the valve is cracked, or if you are simply not comfortable draining the tank yourself. A drain valve replacement is one of the more affordable water heater repairs, but doing it without properly isolating the cold supply and relieving pressure can turn a drip into a flood.
Tank and tankless water heaters are serviced by our parent company CanroHeat. We will replace the valve, confirm there are no other leak points, and check the unit over while we are there. For a quick fix and an exact quote, call 604-359-1081.