Combi boiler inlet screen cleaning signs in Greater Vancouver

The cold-water inlet screen on a combi boiler is a small but important filter that protects the domestic hot-water side from grit and scale. Cleaning it is part of keeping a combi delivering strong, steady hot water. Here is what the service involves and the signs that it is due in a Greater Vancouver home.

What inlet screen cleaning involves

During a service, a licensed technician isolates the boiler's water supply, relieves pressure, and removes the inlet screen so it can be flushed of trapped debris and mineral deposits. The screen is then inspected and refitted, the system is refilled and bled, and hot-water flow is checked to confirm the restriction is gone.

It is a routine part of combi maintenance and pairs naturally with checking the domestic heat exchanger for scale. Keeping the screen clear prevents grit from migrating into the narrow passages of the exchanger, where buildup is harder and costlier to clear later.

• Isolating the supply and relieving pressure safely
• Removing and flushing the screen of grit and scale
• Inspecting, refitting, and refilling the system
• Verifying restored hot-water flow afterward

Signs the screen needs attention

Watch for hot-water flow that has slowly weakened while cold flow stays fine, hot water that intermittently drops because flow falls below the boiler's trigger rate, or hot water that fades fast when another tap opens. These all point toward a restricted inlet.

Greater Vancouver's water is generally moderate, but localized hardness and years of accumulated grit still justify periodic cleaning. Folding the inlet screen check into an annual service keeps small restrictions from turning into bigger heat-exchanger problems, and a technician can advise the right interval for your home.

• Gradually weakening hot-water flow with normal cold flow
• Intermittent hot-water dropouts near the trigger rate
• Hot water fading quickly under added demand
• Best done alongside annual boiler servicing

Frequently Asked Questions

What is the inlet screen on a combi boiler?

It is a small filter on the cold-water inlet that traps grit and scale before they reach the domestic hot-water side, protecting the heat exchanger.

How do I know the inlet screen needs cleaning?

The usual sign is hot-water flow that has gradually weakened while cold flow stays normal, sometimes with intermittent hot-water dropouts.

Can I clean the inlet screen myself?

It requires isolating the supply and opening the boiler's plumbing, so it is a task for a licensed technician who can do it without risking the system.

How often should it be cleaned?

Checking it during an annual service is a good baseline, with cleaning as needed based on flow symptoms and your local water conditions.

HeatLand Heating & Cooling is a licensed and insured, TSBC-certified HVAC company serving homeowners across Greater Vancouver. Our technicians diagnose the real fault, explain your options in plain language, and complete the work safely and to code.

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