Complete Guide to System Boilers 2025
Everything you need to know about system boilers. Compare costs, efficiency, and find out if a system boiler is right for your home.
What is a System Boiler?
A system boiler works with a hot water cylinder but doesn't need a cold water tank in the loft. It's ideal for homes with multiple bathrooms as it can provide hot water to several outlets simultaneously.
Pros and Cons of System Boilers
Advantages
- Good for multiple bathrooms
- Consistent water pressure
- No loft tank required
- Faster hot water recovery
- Compatible with solar thermal
- Energy efficient
- Ideal for family homes
Disadvantages
- Requires hot water cylinder
- Takes up more space
- Higher installation costs
- Hot water can run out
- More complex installation
- Requires regular maintenance
Popular System Boiler Brands
Worcester Bosch
Popular Models
94%
10 years
Vaillant
Popular Models
94%
10 years
Viessmann
Popular Models
94%
10 years
Alpha
Popular Models
93%
10 years
Frequently Asked Questions
What is a system boiler?
A system boiler works with a hot water cylinder but doesn't need a cold water tank in the loft. It's ideal for homes with multiple bathrooms as it can provide hot water to several outlets simultaneously.
How much does a system boiler cost?
System boiler costs range from £2,000 to £4,000, depending on the brand and model. Installation typically costs £1,000-£1,500. Through the ECO4 scheme, eligible homeowners can get a free system boiler installation.
How long does a system boiler last?
A well-maintained system boiler typically lasts 12-15 years. Regular servicing and proper maintenance can extend its lifespan. Most manufacturers offer warranties of 7-10 years.
Is a system boiler suitable for my home?
System boilers are ideal for medium to large homes with multiple bathrooms. They're perfect for family homes where multiple people need hot water at the same time. However, they require space for a hot water cylinder.
Ready to Upgrade Your Boiler?
Check if you qualify for a free system boiler through the ECO4 scheme. Our experts will help you choose the right model for your home.