Buy a System Boiler with Installation Included

Buy a system boiler with installation included from Master Gas London. Explore our extensive system boiler guide for expert advice and tailored recommendations. With transparent pricing, skilled installation, and premium service, we guarantee a hassle-free experience.

System boiler prices from £2510, all system boiler offers include everything you need

System Boilers: The Complete Guide

Welcome to Master Gas London’s complete system boiler guide. We will cover everything you need to know about system boilers, including their history, effectiveness, advantages, and disadvantages. This guide will give you important information to help you decide if a system boiler is the right choice for you or your property.

System Boiler Offers

About System Boilers

A system boiler operates similarly to a conventional boiler but removes the necessity for a separate cold water tank and expansion tank when paired with an unvented cylinder. Featuring a sealed system design, it enhances energy efficiency and minimizes fuel consumption. System boilers deliver rapid and uniform heating, particularly when used with unvented cylinders. Ideal for larger properties, they guarantee an abundant supply of hot water.

Hisory of System Boilers

System boilers have evolved significantly, transforming heating technology for greater efficiency and convenience. In the past, gravity-fed hot water systems were common, but they were inefficient and required extensive pipework. However, the introduction of sealed system boilers in the late 20th century revolutionized the industry. These boilers eliminated the need for a separate cold water tank, providing a more efficient heating solution. With advanced controls and technology, system boilers have improved heating efficiency and reduced fuel consumption.

Efficiency of System Boilers

System boilers offer exceptional efficiency, making them an ideal choice for residential and commercial settings alike. With their sealed system design, they minimize heat loss. Moreover, system boilers often integrate advanced controls and technology to maximize energy efficiency and lower fuel consumption, leading to reduced energy costs.

Pros of System Boilers

Space Saving

System boilers eliminate the need for a separate cold water and expansion tank, making them a more suitable option than conventional boilers for properties that require a hot water cylinder but have limited space.


System boilers provide rapid hot water delivery and distribute heat evenly throughout your property, ensuring a comfortable living environment.

Hot Water Supply

With a dedicated unvented hot water cylinder, system boilers offer hot water supply at high pressure to multiple outlets simultaneously, accommodating the needs of larger households.

Cons of System Boilers

Higher Upfront Cost

System boilers typically have a higher upfront cost compared to combi boilers as they require a hot water cylinder and external components.

Maintenance Cost

A system boiler will have higher maintenance costs as both the boiler and unvented cylinder will require servicing. Also external components are not covered by the boiler warranty.

System Boiler Installations From £1900

What's included in a new boiler installation

Combi Boiler Deals
From £2510

Looking for a new system boiler? Master Gas London has got you covered with our latest offer starting from just £2510, including installation.

Things to Consider


Make sure you choose a system that’s the right size for your home and your hot water needs


Choose a reputable brand with a good track record for reliability and performance such as Worcester Bosch, Vaillant, Baxi or Glow Worm.


Make sure you have your system boiler serviced regularly to keep it running smoothly and efficiently.

Summary of System Boilers

System boilers offer efficient heating and fast hot water delivery, making them an excellent choice for many homes and businesses. With their design, improved energy efficiency, and convenient hot water supply, system boilers provide reliable heating solutions. However, consider the initial cost and hot water cylinder size before making a decision. Consult a professional heating engineer from Master Gas London for expert advice and installation services tailored to your requirements.

System Boiler Brands we Install...

Master Gas London takes pride in installing premium boiler brands like Worcester Bosch, Vaillant, Baxi, and Glow Worm. Our skilled gas engineers are proficient in installing all models from these reputable manufacturers. As an approved installation provider for these leading brands, you can rely on our expertise to deliver top quality system boiler installations. Reach out to us today to schedule your installation.

System Boiler installations Hassle Free...

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What Our Customers Say...


A system boiler is a type of central heating appliance that provides both heating and hot water for your home or business. It works alongside a hot water cylinder, ensuring a constant supply of hot water to multiple outlets simultaneously.

Unlike conventional boilers, system boilers do not require a separate cold water  or expansion tank. They have a built-in expansion vessel and operate with a sealed system, which improves efficiency and eliminates the need for a loft or attic space to accommodate a cold water tank.

Yes, system boilers are known for their energy efficiency. The sealed system design minimizes heat loss, ensuring efficient heating and hot water delivery. Additionally, many system boilers incorporate advanced controls and technology to optimise energy usage and reduce fuel consumption.

Yes, system boilers work best alongside unvented cylinders. Unvented cylinders are pressurised, allowing for higher flow rates and more efficient hot water delivery. When combined with a system boiler, they ensure a consistent supply of hot water to multiple outlets simultaneously.

The size of the system boiler required depends on various factors, including the size of your property and your hot water demands. It is best to consult with a heating engineer or professional installer who can assess your needs and recommend the appropriate boiler size.

The installation time for a system boiler can vary depending on the complexity of the project. On average, a system boiler installation can take a day. However, this can be longer depending on the specific circumstances of your property.

Like any heating appliance, system boilers require regular maintenance to ensure optimal performance. It is recommended to have your system boiler serviced annually by a qualified heating engineer. Routine maintenance helps identify and resolve any potential issues before they become major problems.

In many cases, it is possible to replace an existing boiler with a system boiler. However, the feasibility will depend on the specific circumstances of your heating system and property. It is best to consult with a heating engineer or professional installer to determine the compatibility and requirements for a system boiler replacement.