Baxi 300d Direct Unvented Hot Water Cylinder

The Baxi 300L Direct Unvented Hot Water Cylinder is designed to deliver reliable mains pressure hot water for domestic and light commercial applications. Ideal for properties without a boiler or for electric-only heating, this direct model uses immersion heaters to heat stored water efficiently.

Built for durability and consistent performance, Baxi unvented cylinders are a popular choice among installers and homeowners seeking a straightforward, high-performance hot water solution.

Key Features

• 300 Litre Capacity – Suitable for smaller properties or low-demand applications
• Direct Heating System – Uses immersion heaters for electric-only operation
• Mains Pressure Hot Water – Strong, consistent flow to taps and outlets
• Unvented Design – No need for cold water storage tanks
• Insulated Cylinder – Helps retain heat and improve efficiency

Where Is It Used?

• Flats and apartments
• Small commercial properties
• Offices and washrooms
• Properties without a gas supply

Direct vs Indirect – What’s the Difference?

A direct cylinder heats water using internal immersion heaters, making it ideal where no boiler is present.

If you’re working with a boiler system, you may require an indirect unvented cylinder instead.

Maintenance & Spare Parts

Maintaining your hot water system is essential for long-term performance. If you're servicing or repairing unvented systems, you can browse our range of:

👉 Heatrae Sadia spare parts

Need Help Choosing?

If you're unsure which cylinder is right for your installation, explore our full range of:

👉 Unvented hot water cylinders
👉 Water heaters and point-of-use systems