0% Finance Available

Buy Now, Pay Later

No Deposit Required

Next Day Installs

What is a System Boiler? (Boiler with Water Tank/Cylinder)

Welcome to our comprehensive guide on system boilers, your one-stop source for all things related to this efficient heating solution. At Plumbing Angels, we are committed to providing you with the most in-depth information and expert advice to help you make informed decisions about your heating system. In this guide, we will delve into the world of system boilers, exploring their benefits, installation process, maintenance requirements, and more.

Understanding System Boilers

What is a System Boiler?

A system boiler, also known as a sealed system boiler, is a type of central heating appliance that provides hot water and heating to your home. Unlike conventional boilers, system boilers incorporate several key components within a single unit, making them a popular choice among homeowners for their efficiency and space-saving design.

Key Features of System Boilers

  1. Efficiency: System boilers are renowned for their high efficiency, ensuring maximum heat output with minimal energy wastage. They are an environmentally friendly choice, helping reduce your carbon footprint.

  2. Space-Saving: With their compact design, system boilers are ideal for homes with limited space. They do not require a separate cold water tank in the loft, making them a practical choice for modern living.

  3. Consistent Hot Water: System boilers deliver hot water at mains pressure, ensuring a strong and consistent flow from your taps and showers, even in multiple bathrooms.

  4. Easy Installation: The installation process for system boilers is relatively straightforward, especially when compared to conventional boilers. However, it should be carried out by a Gas Safe registered engineer to ensure safety and compliance with regulations.

Advantages of Choosing a System Boiler

Energy Efficiency

One of the standout benefits of a system boiler is its exceptional energy efficiency. The sealed system minimizes heat loss, allowing your boiler to operate at peak performance while keeping your energy bills in check.

Hot Water on Demand

System boilers provide hot water on demand, eliminating the need for a water tank in your loft. This not only saves space but also ensures you have a constant supply of hot water, even during peak usage times.

Compatibility with Renewable Energy

System boilers can easily be integrated with renewable energy sources such as solar panels or heat pumps. This makes them an eco-friendly choice and can further reduce your energy costs.

Installation Process

Professional Installation

Installing a system boiler requires expertise and should only be carried out by a qualified Gas Safe registered engineer. They will ensure that the system is installed correctly and complies with safety regulations.

System Components

The key components of a system boiler include:

  • Boiler Unit: This is where the heat is generated.
  • Hot Water Cylinder: Stores the hot water for use.
  • Expansion Vessel: Absorbs excess pressure to maintain system integrity.
  • Pump: Circulates hot water through the central heating system.
  • Controls: Allow you to manage the temperature and schedule of your heating.
System Boiler

Maintenance and Care

Regular Servicing

To keep your system boiler running at its best, it’s essential to schedule regular servicing. A professional engineer will inspect and maintain the components, ensuring safety and efficiency.

System Flush

Over time, the central heating system may accumulate sludge and debris. A system flush can help remove these contaminants, improving performance and prolonging the lifespan of your boiler.


In conclusion, system boilers are a top-notch choice for homeowners seeking efficient, space-saving, and reliable heating solutions. At Plumbing Angels, we are dedicated to providing you with the highest quality information and services to help you make the right choices for your home.

If you’re considering a system boiler installation or have any questions, feel free to contact us today. Our team of experts is here to assist you every step of the way. Make the smart choice for your home comfort – choose a system boiler from Plumbing Angels.

Remember, for professional installation and maintenance, always consult a Gas Safe registered engineer.

Disclaimer: The information provided in this guide is for informational purposes only. Please consult with a qualified professional before making any decisions regarding your heating system.

Still Need A Plumber?

Our team is dedicated to providing excellent customer service and is always ready to help with any inquiries you may have. You can contact us through our website, by phone, or by email. Don't wait, reach out to us today and we'll be happy to assist you in any way we can.
Open chat
Hi there, how can Plumbing Angels help you?