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Specialists in Electric Hot Water Cylinders

What to Look for in a High-Quality, High-Efficiency Unvented Cylinder

4 June 2025

Want high-pressure hot water at every tap in your home? It’s time to get rid of your old, vented cylinder and invest in an unvented cylinder. Unvented cylinders deliver mains-pressure hot water on demand, making sure you have comfortable showers, plenty of pressure and heat for washing up after a meal, and more.

However, if you’re buying a new unvented cylinder, it’s important to realize that they’re not all created equal. If you’re making this investment, you want the best. That means efficient, durable, and built to last, with a price tag that won’t break your budget.

Not sure how to find the right model? Our guide will walk you through the key things to look for when buying a high-quality, high-efficiency unvented cylinder.

1. Superior Insulation for Maximum Efficiency

When it comes to efficiency and savings, heat retention is everything. A high-quality unvented cylinder should have thick, high-grade insulation to reduce heat loss. Look for cylinders with high-density polyurethane foam or vacuum insulation panels. They keep water hotter for longer, reducing energy waste and lowering your bills.

2. Corrosion-Resistant Materials

Your cylinder holds water under pressure 24/7, so it needs to stand the test of time. Stainless steel and glass-lined steel offer excellent resistance to corrosion, giving you both longevity and reliability. Cheaper materials might save you money upfront, but they’ll cost you in the long run. A higher-quality unvented cylinder will pay for itself over its lifespan.

3. Smart Heat Exchange Technology

A well-designed heat exchanger gives you fast, efficient heating. Large surface area coils transfer heat more effectively, meaning your water heats up faster and your unit doesn’t have to work as hard. That translates to better efficiency and lower energy consumption, both of which are good things in this economy.

4. A Reliable Safety System

Safety should never be an afterthought. A high-quality unvented cylinder comes with built-in pressure and temperature relief valves, making sure your system doesn’t overheat or become over-pressurised. A low-quality cylinder without the right safeguards is a serious risk.

5. Warranty and Manufacturer Reputation

A long warranty is a sign that the manufacturer has confidence in a product’s durability. Look for at least a 25-year warranty on the cylinder itself. Trusted manufacturers with strong customer reviews and a reputation for reliability are always a safer bet than budget brands with limited support.

Professional Installation and Maintenance

Choosing the right unvented cylinder is only half of the equation. It’s also important to make sure that your cylinder is installed by experienced, G3-qualified engineers. Under UK law, they’re the only ones allowed to install, service, or maintain unvented cylinders.

And don’t skimp when it comes to maintenance. Annual maintenance can extend the life of your unvented cylinder significantly while also helping you avoid expensive emergency repairs by spotting problems like leaks or failing valves before they happen.

Upgrade to the Best

Investing in a high-efficiency unvented cylinder means better performance, lower energy bills, and long-term reliability. That said, there are a lot of models on the market, and it can be confusing to choose between them. If you’re in the market for an upgrade, EasyFlow can help you choose the right system for your home. Contact us today and enjoy the benefits of top-tier heating technology!

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