Why is my hot water suddenly coming out rusty brown?

Rusty brown hot water is typically caused by sediment buildup or corrosion inside your water heater tank, and it needs immediate attention to prevent further damage to your plumbing system.

The most common cause is sediment accumulation at the bottom of your water heater tank. Over time, minerals from Ottawa's water supply settle and create a layer of rust-colored debris. When this sediment gets stirred up - often due to increased water usage or temperature changes - it flows out through your hot water taps. This is especially common in older water heaters (8+ years) that haven't had regular maintenance.

Corrosion of the tank's interior is another serious possibility. If the anode rod (a sacrificial metal component designed to prevent tank corrosion) has deteriorated completely, the tank walls begin rusting. This creates the brown discoloration you're seeing. In Ottawa's climate, where water heaters work harder during cold months, this corrosion can accelerate if the unit isn't properly maintained.

Check if the discoloration appears only in hot water - if cold water is also brown, the issue may be with Ottawa's water supply or your home's pipes rather than the water heater. Contact the City of Ottawa if cold water is affected. However, if only hot water shows discoloration, the problem is definitely your water heater.

Don't ignore this issue - rusty water can stain fixtures, damage appliances, and indicate your water heater is nearing failure. Running the water heater with significant sediment buildup forces it to work harder, increasing energy costs and shortening its lifespan. If the tank is corroding internally, it could eventually leak and cause water damage.

Flush your water heater immediately by draining several gallons from the drain valve at the bottom of the tank. If water runs clear after 10-15 minutes, sediment was likely the culprit. However, if water remains discolored or you're uncomfortable performing this maintenance, contact a licensed plumber. For a professional diagnosis and water heater service in Ottawa, request a quote from Ottawa Pro Plumbing to ensure your system is operating safely and efficiently.

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