What Is an Unvented Cylinder?
An unvented hot water cylinder stores water at mains pressure, delivering powerful, consistent flow throughout your home — even when multiple taps and showers are running. Unlike traditional vented systems, there’s no need for a header tank in the loft, freeing up space and reducing the risk of contamination.
Ideal for Larger Homes
If your property has several bathrooms or a high demand for hot water, an unvented cylinder provides a steady supply without loss of pressure. They’re designed to maintain strong, balanced water flow across multiple outlets — perfect for families or properties with power showers, freestanding baths, or underfloor heating.
- High flow rate — ideal for large or multi-bathroom homes.
- Compact, sealed system — no loft tanks or gravity feed required.
- Fast recovery times — more hot water available, more quickly.
- Quiet operation — fewer moving parts and no noisy feed tanks.
The Benefits of Stored Hot Water
A stored hot water system ensures hot water is always available on demand. The cylinder acts as a thermal store, keeping water at a consistent temperature and pressure, so there’s no sudden temperature drop when another tap is opened. This reliability makes unvented systems one of the most comfortable and convenient heating options available.
Pressure and Performance
Because unvented cylinders draw directly from the mains, they rely on the property’s water pressure and flow rate. Warm Right engineers always check these parameters during a survey to ensure your system performs perfectly once installed. When designed and installed correctly, the result is exceptional pressure and fast, consistent hot water delivery.
Twin Coil & Renewable Options
For homes using or considering renewable energy, twin-coil unvented cylinders are an excellent choice. The second coil connects to a solar thermal or heat pump system, pre-heating your hot water using sustainable energy. This hybrid approach reduces energy bills and carbon emissions while maintaining powerful performance all year round.
- Solar-ready — compatible with thermal panels and air-source systems.
- Smart controls — integrate with modern home energy systems.
- Future-proof design — flexible setup for hybrid heating solutions.
Electric-Only Cylinders
For properties without gas or oil, electric unvented cylinders provide the same mains-pressure benefits. Using high-efficiency immersion heaters, these systems deliver hot water quickly and efficiently — ideal for apartments, rural homes, or off-grid installations.
- No flue or fuel supply needed — simple installation and low maintenance.
- Perfect for smaller or all-electric homes — reliable and compact.
- Compatible with off-peak tariffs — efficient and economical hot water production.
Installed & Serviced by Qualified Engineers
Unvented cylinders must be installed and maintained by a G3-qualified engineer — a certification held by every Warm Right technician. Our team ensures safety valves, expansion vessels, and controls are correctly fitted and tested, giving you complete confidence in system performance and compliance.
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