What Is a Heat-only Boiler and How Do They Work?
This article is part of our complete guide to different boiler types.
Today we delve into the world of heat-only boilers, which are also referred to as conventional, traditional, open vent or regular boilers. These terms are often used interchangeably to describe a type of boiler system that’s been a staple in British homes for decades, known for its reliability and straightforward operation.
What Is a Heat-Only Boiler?
A heat-only boiler is a type of central heating system that requires a cold water storage tank, usually located in the loft, and a hot water cylinder often found in the airing cupboard. Unlike combination boilers that provide hot water on demand, heat-only boilers store hot water in the cylinder for use when needed. This traditional approach to heating and hot water supply makes them a preferred choice for many, especially in homes where water usage is high or multiple outlets are used simultaneously.
How Do Heat-Only Boilers Work?
The operation of a heat-only is relatively straightforward. Water is drawn from the cold water storage tank and heated by the boiler. This heated water is then stored in the hot water cylinder until it's needed, whether for radiators or hot water taps. The system is open vented, meaning it relies on natural pressure from the cold water tank, usually in the loft, to push water through the system and maintain a balanced pressure. This traditional setup includes a feed and an expansion tank, which compensates for water loss through system evaporation and expansion when heated.
Pros and Cons of Heat-Only Boilers
When considering a heat-only boiler for your home, it's important to weigh its advantages and disadvantages. Here's a summary of the key points:
Pros
Ideal for homes with multiple bathrooms.
Can provide hot water to several taps at once.
Compatible with older radiator systems.
Easier to maintain due to its simpler mechanics.
Less likely to experience drops in water pressure.
Cons
Requires more space for tanks and cylinders.
Less efficient than combi boilers.
Can lead to heat loss from hot water cylinder.
Initial installation can be complex.
Higher operating costs compared to combi boilers.
Advantages Of Heat-Only Boilers
One of the primary benefits of heat-only boilers is their suitability for larger homes with higher hot water demands, particularly where water is being used in multiple locations simultaneously. These systems can maintain a steady water pressure, ensuring that showers and taps are unaffected by the use of water elsewhere in the house. In addition, their compatibility with older radiator systems makes them a viable option for properties or homes with existing traditional heating systems, avoiding the need for extensive modifications.
Disadvantages Of Heat-Only Boilers
Despite their benefits, heat-only boilers have certain drawbacks. The requirement for a cold water storage tank and a hot water cylinder means that they consume more space, which can be a significant disadvantage in smaller homes or flats. Furthermore, these boilers are generally less efficient than their modern combi counterparts, as hot water stored in cylinders can lose heat over time, leading to higher energy consumption costs. The complexity of their installation and the potential for higher operating costs are also factors that need consideration.
Choosing the Right Boiler for Your Home
When deciding whether a heat-only boiler is right for your home, consider factors such as the size of your property, hot water demand, and your existing heating system. For households with higher water usage, multiple bathrooms, and sufficient space for the necessary tanks and cylinders, a heat-only boiler can be an effective and reliable choice. However, for those prioritising efficiency and space-saving, a combi boiler might be a better option.
Conclusion
Heat-only boilers, with their traditional design and operation, offer a reliable solution for larger homes with high hot water demands. Understanding how they work, along with their pros and cons, can help you make an informed decision about the best heating system for your home. While they may not be the most efficient option available today, their suitability for specific situations makes them an important consideration in the diverse world of home heating solutions.
In the end, the choice between a heat-only boiler and other types of boilers such as combi boilers largely depends on your home’s specific requirements and preferences. Considering the characteristics and operational dynamics of heat-only boilers can lead you toward a heating solution that best aligns with your family’s needs, ensuring comfort and efficiency in your home.
Boasting over 30 years of experience, MPC Energy Ltd is a leading provider of home energy improvements in the UK. Renowned for our expertise in insulation, heating, and eco-friendly solutions, we take pride in using only top-tier products and offering exceptional service and workmanship. Our services extend across the nation with a focus on enhancing home efficiency through the Energy Company Obligation scheme and other initiatives. When you apply for funding, we’ll handle the application work and then let you know if we can install your boiler with a full or partial subsidy. Contact us in Clydebank, West Dunbartonshire for energy assessments and installations that cater to all budgets.
For more information about our services, contact us via our website or call to speak to one of our energy consultants at +44 141 951 7887.
