
Unvented Cylinders
Expert unvented cylinder installation and maintenance for superior hot water performance. Unvented hot water cylinders deliver high-pressure hot water to multiple outlets simultaneously, providing excellent shower performance and the ability to run several hot taps at once without pressure drop.
At boilerPRO, we supply and install unvented cylinders from leading manufacturers, working with system boilers or renewable heating sources to deliver reliable hot water solutions for modern homes. Our G3-qualified engineers handle all aspects of unvented cylinder work including installation, annual servicing and repairs.
Benefits of Unvented Hot Water Cylinders
Unvented cylinders offer significant advantages over traditional vented cylinder systems. High water pressure throughout your home means powerful showers without the need for pumps, fast-filling baths and strong flow to kitchen taps even when multiple outlets are used simultaneously. Without cold water tanks in the loft, you gain valuable storage space and eliminate the risk of frost damage or contamination.
Unvented systems are also more energy-efficient than vented alternatives because they lose less heat and can integrate effectively with renewable heating technologies like solar thermal or heat pumps. For larger homes with multiple bathrooms or properties where excellent shower performance is a priority, unvented cylinders deliver the hot water capacity and pressure modern households expect.
Professional Installation by G3-Qualified Engineers
Installing unvented cylinders requires specialist knowledge and qualifications because these systems operate under mains pressure. Our engineers hold the mandatory G3 unvented hot water qualification, ensuring installations comply with Building Regulations and manufacturer requirements. During installation, we assess your property’s incoming water pressure and flow rate to confirm an unvented system is suitable, select appropriately sized cylinders based on your household’s hot water demands, install all required safety devices including pressure relief valves and expansion vessels, integrate the cylinder with your heating system and commission the complete installation with full testing and certification. Proper installation is critical for safe, reliable operation, which is why choosing qualified installers like boilerPRO protects your investment and ensures your system performs as designed.
Annual Servicing and Maintenance
Unvented cylinders require annual servicing by a qualified engineer to maintain safe operation and comply with manufacturer warranty terms. During servicing, our G3-qualified engineers test all safety devices including temperature and pressure relief valves, check expansion vessels and pressure settings, inspect for signs of corrosion or deterioration, verify that immersion heaters are functioning correctly and ensure the system complies with current regulations. Annual servicing identifies potential issues early, maintains efficient operation and provides documentation for warranty and insurance purposes.

Superior Hot Water Solutions
Contact boilerPRO to discuss unvented cylinder installation or servicing. Our G3-qualified engineers deliver professional installations that provide high-pressure hot water throughout your home with the reliability and performance modern households demand.



















