Why is my hot water pressure low while the cold water pressure is fine?

Low hot water pressure with normal cold water pressure typically indicates a problem with your water heater or the hot water supply lines, not your home's main water pressure system.

The most common culprit is sediment buildup in your water heater tank. Over time, minerals from Ottawa's moderately hard water settle at the bottom of the tank and can clog the hot water outlet pipe or dip tube. This restricts flow even though the tank is heating water properly. Tank-style water heaters are especially prone to this after 5-8 years of use.

Hot water supply lines can also develop restrictions from mineral deposits, especially in older homes with galvanized pipes. The hot water flowing through pipes accelerates corrosion and scaling compared to cold water lines. If your home has original galvanized plumbing from the 1960s-80s, this is likely contributing to the pressure loss.

For tankless water heaters, the issue is often a clogged heat exchanger or inlet filter. These units are sensitive to sediment and require annual maintenance to prevent flow restrictions. A partially blocked heat exchanger will reduce flow rate while still providing hot water.

Start by checking your water heater's age and maintenance history. If it's over 8 years old and hasn't been flushed recently, sediment buildup is the probable cause. You can also test the hot water pressure at different fixtures - if it's low everywhere, the problem is at the water heater. If it's only affecting certain taps, you may have localized pipe restrictions.

This requires professional diagnosis since accessing water heater components and flushing systems safely requires proper tools and experience. A licensed plumber can determine whether you need tank flushing, component replacement, or pipe repairs. For a free assessment of your hot water pressure issue, request a quote from Ottawa Pro Plumbing.

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