What is a Sealed System Boiler? A Complete Guide
If you're thinking about upgrading your heating system, you might have heard of a system boiler. This guide will explain what a system boiler is, how it works, its benefits, and how it compares to other boiler types to help you decide if it's right for your home.
How Does a System Boiler Work?
A system boiler heats water for your central heating and hot water supply. Unlike a combi boiler that heats water instantly, a system boiler uses a separate hot water cylinder to store heated water. However, it doesn’t need a cold water tank in the loft, as it draws water directly from the mains.
Here’s how system boilers works:
Cold water enters the system boiler.
The boiler heats the water with a burner and heat exchanger.
Hot water is stored in a cylinder for later use.
The central heating system sends warm water to radiators and underfloor heating.
Great for homes with high hot water demands, system boilers can deliver water to several taps and showers at once without a drop in pressure. No Loft Tank Needed – Unlike traditional boilers, system boilers use water from the mains, saving space in your loft.
Energy Efficient – Modern system boilers are very effective and work well with renewable energy like solar thermal systems.
Strong Water Pressure – System boilers use mains water, providing better water pressure than traditional boilers.
Compatible with Larger Homes – Ideal for homes with multiple bathrooms needing hot water at the same time.
Is a System Boiler Right for Your Home?
A system boiler is suitable for:
Homes with multiple bathrooms needing hot water simultaneously.
Properties with space for a hot water cylinder but no loft for a tank.
Households that require good water pressure for showers and taps.
A system boiler may not be suitable if:
Your home is small or has limited space.
You want hot water on demand without a storage cylinder.
You prefer a system that doesn’t store water, like a combi boiler.
How Much Does a System Boiler Cost?
Installation costs vary by brand, model, and complexity. On average:
A new system boiler costs between £1,000 and £2,500.
Installation ranges from £500 to £1,500 based on your setup.
For a precise quote, consult a Gas Safe registered engineer like Thermotec Plumbing and Heating.
Get Expert System Boiler Installation
Thinking of upgrading to a system boiler? Thermotec Plumbing and Heating offers expert installation and advice to find the right boiler for your home.
Call us today: 07850116944
Book an appointment: www.thermo-tec.co.uk
Let us help you stay warm with an efficient heating system!
