Struggling with weak shower pressure or running out of hot water halfway through a bath? Older hot water cylinders are heavily insulated and rely on gravity-fed systems, which limits flow rates and consumes excess energy.
Understanding Vented vs. Unvented Cylinders
Vented cylinders rely on a large water tank in the loft to feed water via gravity. They require attic space and provide lower water pressure on upper floors.
Unvented cylinders connect directly to the cold water mains. Because they run at mains pressure, they deliver powerful, high-performance hot water to all taps and showers simultaneously, eliminating the need for header tanks.
Key Signs Your Cylinder Needs Replacing
Look out for signs of corrosion or rust around the cylinder base, slow heating recovery times, and high utility bills.
If your cylinder is over 15 years old, upgrading to a modern stainless steel cylinder will improve thermal retention, keeping water hot for up to 24 hours after heating has stopped.
- - Constant pilot light issues or slow recovery times
- - Mould or dampness in your airing cupboard
- - Scale buildup causing reduced hot water capacity
Old (Vented) vs. Modern (Unvented) Cylinder Systems
Old Vented Cylinders (Gravity-Fed)
- ✕ Water Feed: Relies on a cold water storage tank in the loft.
- ✕ Shower Pressure: Gravity-fed, leading to weak or inconsistent pressure.
- ✕ Space Required: Requires valuable loft storage and cupboard space.
- ✕ System Efficiency: High thermal heat loss, slow reheat times.
New Unvented Cylinders (Mains Pressure)
- ✓ Water Feed: Connected directly to the cold water mains.
- ✓ Shower Pressure: Deliver high mains pressure to all taps/showers.
- ✓ Space Required: Eliminates loft tanks, freeing up space.
- ✓ System Efficiency: Highly insulated, rapid recovery, minimal heat loss.
Upgrading your hot water system is an investment that pays off in daily comfort and monthly energy bills. Contact our heating team for a free system evaluation and estimate.
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