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The Ultimate Guide to Heat-Only Boilers: A Comprehensive Overview

Welcome to our comprehensive guide on heat-only boilers. At Plumbing Angels, we strive to provide you with the most up-to-date and accurate information to help you make informed decisions about your heating system. In this guide, we will delve into the intricacies of heat-only boilers, their benefits, installation process, maintenance tips, and more. Whether you’re a homeowner, a heating engineer, or simply curious about heat-only boilers, this guide has got you covered.

What is a Heat-Only Boiler?

A heat-only boiler, also known as a conventional boiler or regular boiler, is a type of central heating system that provides hot water and heating to your home. It operates by heating water in a storage cylinder, which is then distributed through radiators or underfloor heating systems. Heat-only boilers are commonly found in older properties, offering reliable and efficient heating solutions.

The Benefits of Heat-Only Boilers

Heat-only boilers come with several advantages that make them a popular choice for many homeowners:

  1. Reliability: Heat-only boilers have a long-standing reputation for their reliability. They have been tried and tested over the years, making them a dependable heating option.

  2. Compatibility: These boilers are compatible with a wide range of heating systems, making them suitable for both new installations and replacements in older properties.

  3. Hot Water Availability: With a separate hot water storage cylinder, heat-only boilers can provide hot water to multiple taps simultaneously, ensuring an uninterrupted supply.

  4. Flexible Controls: Heat-only boilers offer flexible control options, allowing you to customize your heating preferences according to your needs and schedule.

Hot Water Tap

Installation Process

Installing a heat-only boiler requires professional expertise to ensure optimal performance and safety. Here’s a step-by-step overview of the installation process:

  1. Assessment: A qualified heating engineer will assess your property’s heating requirements and recommend an appropriate heat-only boiler size.

  2. Removing Existing Boiler: If you have an existing boiler, it will be disconnected and removed carefully.

  3. Pipework and Wiring: The heating engineer will install new pipework and wiring to connect the boiler to the central heating system and hot water cylinder.

  4. Flue Installation: A flue, essential for safe ventilation, will be installed to expel combustion gases outside.

  5. Boiler Placement: The heat-only boiler will be positioned in a suitable location, often in the kitchen, utility room, or airing cupboard.

  6. Connection and Testing: The engineer will connect the boiler to the pipework, electrical supply, and controls. They will thoroughly test the system to ensure it operates efficiently and safely.


Maintenance Tips for Heat-Only Boilers

To keep your heat-only boiler functioning optimally and extend its lifespan, follow these maintenance tips:

  1. Annual Servicing: Schedule an annual service with a qualified heating engineer to inspect and clean the boiler, check for any issues, and ensure it operates at peak efficiency.

  2. Bleeding Radiators: Regularly check and bleed your radiators to release trapped air, allowing them to heat up fully.

  3. Monitor Pressure: Keep an eye on the boiler’s pressure gauge, ensuring it remains within the recommended range. Low pressure may indicate a leak or a problem with the system.

  4. Check for Leaks: Inspect your boiler and surrounding pipework for any signs of leaks, such as water stains or dampness. If you notice a leak, contact a professional immediately.

  5. Protect from Freezing: In colder climates, take measures to prevent the boiler and pipes from freezing by insulating them properly.


Heat-only boilers continue to be a reliable and efficient heating solution for many households. Their compatibility, hot water availability, and flexibility in controls make them an appealing choice. In this guide, we have provided a comprehensive overview of heat-only boilers, covering their benefits, installation process, and maintenance tips. If you’re considering a heat-only boiler for your home, consult with a qualified heating engineer to ensure you make an informed decision. Stay warm and comfortable with a heat-only boiler from Plumbing Angels!

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