Gravity Fed Plumbing System: What UK Homeowners Need to Know

Gravity Fed Plumbing System Guide (UK)

If your property has a gravity fed plumbing system, it’s important to understand how it affects your kitchen tap’s water pressure. These systems are still found in many UK homes, especially those built before the 1990s, and they function very differently from modern mains-fed systems. Knowing how yours works helps you fix kitchen tap water pressure issues and choose the right kitchen tap based on your water pressure.

What Is a Gravity Fed Plumbing System?

In a typical UK gravity system, water is stored in a cold-water tank (usually in the loft) and fed down to the taps and appliances via gravity. The pressure depends on the vertical distance—or “head”—between the tank and the tap outlet. This type of system is also known as a “vented system” and is often paired with a hot water cylinder in the airing cupboard.

Key Features of UK Gravity Fed Systems

• Cold water tank located in the loft or attic
• Hot water cylinder on a lower floor (usually in an airing cupboard)
• Low pressure at outlets located far below the tank—like the kitchen sink
• Common in older UK homes that haven’t been modernised

Not sure how strong your kitchen tap pressure is? Here’s how to test your tap water pressure to see if you’re being affected by gravity-fed limitations.

Common Water Pressure Issues

Because the kitchen is typically on the ground floor, it’s often the area worst affected by low water pressure in gravity systems. You might notice:

• Trickling or slow-flowing kitchen taps
• Hot water pressure significantly lower than cold
• Difficulty filling kettles or pots quickly

If you’re experiencing any of these symptoms, take a look at our guide to fixing kitchen tap water pressure for solutions that work with gravity systems.

Improving Water Pressure in a Gravity System

To improve flow to your kitchen tap, you don’t necessarily need to replace your entire plumbing system. Here are some effective options:

• Install a single outlet booster pump: Ideal for boosting kitchen tap performance.
• Use taps rated for low pressure: Look for taps that operate well at 0.1 bar or less.
• Upgrade your cold water storage tank: A larger tank placed higher up (where possible) may slightly increase pressure.

When shopping for a new tap, make sure it’s suitable for your home’s plumbing. Our article on choosing the right kitchen tap for your water pressure can help you narrow it down.

For further guidance, you can also check WaterSafe UK’s overview of gravity-fed systems.

Considering a System Upgrade?

If you’re undergoing a full renovation or continually battling low flow, you might consider upgrading to a combi boiler or an unvented (mains pressure) system. These provide better pressure at all outlets but come with higher installation costs and requirements.

For many UK homes, especially smaller properties, a well-maintained gravity system with the right components is still an efficient and affordable option.

Conclusion: Get the Most from Your Gravity Fed Plumbing System

Understanding how your gravity fed plumbing system works is key to maintaining good water flow at your kitchen tap. Whether you’re replacing a tap, troubleshooting pressure issues, or thinking about upgrades, making informed decisions can prevent long-term frustration and improve performance.

Need help choosing the right parts or tap for your system?
Contact us for expert advice.