A drain valve that drips constantly or will not fully close usually needs replacing, and sediment build-up is often part of the underlying story.
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Quick answer
Replacing a leaking or seized drain valve on a Chilliwack gas water heater generally falls in the typical water heater repair range of $150 to $650, plus the usual $90 to $150 diagnostic visit most shops credit toward the repair if you proceed. That range is a ballpark drawn from 2026 public market data, not a fixed quote, and a certified CANRO gas technician confirms the actual number once the tank has been assessed. A straightforward plastic-to-brass valve swap on an accessible tank sits toward the lower end; one where the tank has to be partially drained around a stuck fitting, or sediment has packed the opening, takes a bit longer.
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The drain valve sits near the bottom of the tank and is used to flush sediment or fully empty the tank when needed. Many standard water heaters ship with a plastic drain valve, which can crack or degrade with age, especially if it has ever been operated with force on a stiff handle. Sediment that settles at the tank bottom can also pack into the valve opening over time, so even a mechanically sound valve can end up seized or partially blocked simply from years of accumulated mineral deposits sitting against it.
A valve that drips continuously, even slightly, is worth addressing promptly, since a slow leak at the bottom of a tank can go unnoticed in a mechanical closet until it has caused water damage to the surrounding floor or subfloor.
Whether the old valve threads out cleanly or has partially corroded or fused into the tank fitting is the main variable, since a stuck valve takes longer and needs more care to avoid damaging the tank opening itself. Sediment level inside the tank matters too, since a tank that has never been flushed often needs that done at the same time to give the new valve a clean seat to close against. Upgrading from a plastic valve to a brass one is a common choice at replacement time and adds a small amount to the part cost, though it usually pays off in longer service life.
| Item | Typical range (CAD) | Notes |
|---|---|---|
| Diagnostic / service call | $90 – $150 | Often credited toward the repair if you proceed |
| Drain valve replacement, installed | $150 – $650 | Seized valves or heavy sediment push toward the top |
| Licensed labour rate | $95 – $165 per hour | Reflects sediment and fitting condition |
On its own, a failed drain valve is a small, targeted repair. It is worth stepping back when the valve has seized due to heavy sediment on a tank that is already older and hasn't had regular maintenance, since that combination often means other components are also under more strain than they should be. If the tank shows rust at the seams or other age-related wear alongside the valve problem, it's worth asking your technician for a separate estimate on a full gas storage tank replacement, since that may be the more practical option compared with repeated small repairs.
Because Chilliwack's water supply draws on Fraser Valley groundwater with more dissolved minerals than Metro Vancouver's soft reservoir water, sediment buildup at the base of a storage tank tends to happen a bit faster here, and that sediment is a common contributor to seized or clogged drain valves. Technicians working in Chilliwack's older homes near the downtown core, where tanks have often gone years without a flush, frequently find this exact combination during a service call.
Safety note
Drain valve work involves relieving pressure on a gas-fired water heater, so it should be handled by a licensed technician. If you ever smell gas or suspect a carbon monoxide problem near the water heater, leave the home immediately and call FortisBC's emergency line at 1-800-663-9911.
It's not an immediate emergency, but a steady drip should be addressed promptly to avoid water damage to the surrounding floor over time.
This involves relieving pressure on a pressurized, gas-fired appliance, so it is best left to a licensed technician to do safely.
Sediment buildup at the bottom of the tank, especially on harder Fraser Valley water, is a common cause of a valve becoming stiff or fully seized.
Many technicians recommend it at replacement time since brass valves tend to hold up better over the long run than the plastic valves many tanks ship with.
Not automatically, but a technician will typically flush sediment while the valve is out if the tank clearly needs it.
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