Enhancing Water Pressure with a Combi Boiler

May 05, 2023 | News

Increase water pressure combi boiler

As homeowners, we constantly seek ways to improve our daily lives, and one area that can make a significant difference is the water pressure in our showers. For those with a combi boiler, increasing shower water pressure may appear challenging. However, this guide will provide a comprehensive understanding of combi boilers and alternative solutions to enhance your shower experience.

Understanding Boiler Pressure and Combi Boilers

To effectively increase water pressure in a home with a combi boiler, it’s essential to understand its function. Combi boilers are unique, compact systems that supply both hot water and central heating. They merge components of traditional central heating systems (hot water cylinder and cold water storage tank) into a single unit.

These boilers draw water directly from the mains, heating it before distributing it throughout the home. Consequently, water pressure from taps and showers depends on the main water supply. Homes with strong water pressure experience better water flow, while those with weaker pressure may struggle, particularly in larger homes with numerous taps.

Methods to Increase Water Pressure with a Combi Boiler

A key disadvantage of combi boilers is the limited options for enhancing water pressure. Unlike traditional boiler systems, installing a boiler pump isn’t possible, as combi boilers must obtain water directly from the mains.

It’s crucial to ensure your boiler can support a consistent, strong water flow. Larger combi boilers offer better flow rates, so when installing a new system, confirm the boiler can handle your home’s water demands. A professional installer can recommend the most appropriate solution for your needs.

However, your home’s flow rate will still be restricted by the mains water supply. If you live in an area with a low flow rate, your combi boiler’s performance will always be limited.

Book a boiler quote

Call our specialists on 020 8395 8616 or fill in our booking form.

Alternative Solutions to Improve Shower Water Pressure

An electric shower is a viable alternative for increasing shower water pressure. These versatile devices draw cold water directly from the mains, bypassing the boiler. The shower unit’s heating element warms the water to the desired temperature, with the unit’s kilowatt (kW) rating affecting the pressure or flow rate.

As electric showers don’t rely on the boiler for water, they maintain a consistent flow even when multiple taps or showers are in use. A higher kW rating results in stronger flow, although it’s still dependent on the main water supply’s pressure.

The Compatibility of Power Showers with Combi Boilers

Power showers aren’t compatible with combi boilers. They require a hot water cylinder—an external tank found in homes with system or regular boilers. Power showers use a built-in pump to increase water pressure from the hot water cylinder but aren’t designed to work with combi boilers, which draw water from the mains.

Considering a System or Regular Boiler Replacement

While combi boilers have numerous advantages, including compact size and efficiency, they may not be suitable for larger homes with high hot water demands or those with weak mains water pressure.

System and regular boilers, however, are compatible with power showers and can deliver stronger, more consistent water pressure, especially in larger homes. If you’re contemplating a boiler system change, consult a qualified boiler installer for expert advice tailored to your needs.


  • Combi boilers rely on mains water pressure, which dictates water pressure for taps and showers.
  • Power showers are incompatible with combi boiler systems due to the absence of a boiler pump
  • Electric showers can help enhance shower water pressure to some extent.
  • System and regular boilers can be connected to power showers, offering better pressure and flow rates.

Ensuring Optimal Performance of Your Combi Boiler

To maximize your combi boiler’s performance, it’s important to maintain it properly. Regular servicing by a Gas Safe registered engineer will ensure your boiler functions efficiently and safely. They can also assess your home’s water pressure and provide recommendations for any adjustments or upgrades.

Furthermore, inspecting and cleaning the boiler’s filters and heat exchangers regularly will help maintain optimal water flow and pressure. This can also extend the boiler’s lifespan and prevent potential breakdowns.

Improving Main Water Supply Pressure

In some cases, the low water pressure in your home might be due to issues with the main water supply. Contacting your local water company can help you determine if there’s a problem with the water pressure in your area. If so, they may be able to address the issue or suggest suitable solutions.

Additionally, you can request a pressure test from a plumber to identify any issues within your home’s plumbing system. They can recommend necessary repairs or modifications to improve water pressure.

Final Thoughts on Enhancing Water Pressure with a Combi Boiler

Increasing water pressure in a shower with a combi boiler can be challenging due to the system’s inherent limitations. However, by understanding the factors that affect water pressure and exploring alternative solutions, such as electric showers, homeowners can still enhance their shower experience.

If you’re considering a change in your boiler system, always consult a qualified professional for personalized advice and guidance. Proper maintenance and addressing any issues with the main water supply can also contribute to improving your home’s water pressure and overall comfort.

Open chat
How can we help?
Call now, we’re here to help 020 8395 8616