A system boiler works alongside a hot water storage cylinder to provide central heating and hot water to larger properties. If your system boiler is failing or inefficient, Norvera can arrange a fixed-price replacement through a Gas Safe registered installer across the UK.
A system boiler (also called a sealed system boiler) heats water for both the central heating circuit and a separate hot water cylinder. Unlike a regular boiler, it doesn't need a cold water tank in the loft — most components are built into the boiler unit. This makes it cleaner than a regular boiler while still providing excellent hot water capacity for larger homes.
System boilers are ideal for larger homes with two or more bathrooms, where multiple hot water outlets may be in use simultaneously. They deliver hot water at good pressure from all taps and showers. If you have, or want, a solar thermal system, a cylinder-based setup like a system boiler is also compatible.
From your first message to a working boiler — here's what to expect.
Answer a few short questions. Takes about two minutes. You can add photos of your boiler or any error codes showing.
We connect you with a Gas Safe registered installer in your area who can visit quickly and assess the job.
Your installer gives you a clear written price before anything starts. No surprises and no obligation to proceed.
Answers to the questions we hear most often.
Answer a few questions and we'll connect you with a Gas Safe installer in your area.
Gas Safe registered installers · Fixed-price quotes · No obligation