Everything you need to know about gas combi boilers
Interested in installing a combi boiler for your property? Here’s everything you need to know to help you make the most informed decision. Find and compare combi boiler installers with SpotDif today.
Your guide to gas combi boilers
Welcome to SpotDif, where we understand the importance of making informed choices when it comes to your home heating. As one of the UK's price comparison websites, we have the responsibility to guide you through everything you need to know about gas combi boilers.
However, we understand that every home is unique, and it's crucial to weigh both the benefits and the drawbacks of these systems. That's why our team at SpotDif is dedicated to providing you with comprehensive information on combi boiler prices, efficiency, and more, helping you decide if a combi boiler is a right fit for your home.
Ready to explore your options? Compare and save on your new boiler with SpotDif. Your ideal home heating solution is just a few clicks away.
Find a combi boiler at the best price with SpotDif
At SpotDif, our main goal is to always be transparent with our customers, and we hope you now have all the information you need to make an informed choice for your property.
Why wait? Take the next step towards a cosy, warm, and efficient home. Start comparing gas boiler prices and installers in your area today.
What type of boiler do you have?
What is a gas combi boiler?
A gas combi boiler is a single, compact system that efficiently provides both central heating and instant hot water in homes. The best of both worlds, right?
It operates without the need for a separate water tank, making it a space-saving and convenient choice, especially for smaller properties or areas where space is at a premium, offering an efficient and practical home heating solution.
How is a gas combination boiler different to a conventional boiler?
A gas combination boiler is distinct from a conventional boiler in several ways. Its main physical difference lies in its space efficiency — combi boilers are more compact since they don't require separate hot water tanks, making them ideal for smaller homes or limited spaces.
In contrast, conventional boilers need additional space for a hot water cylinder. Typically, combi boilers also have a simpler installation process and can be more energy-efficient, leading to potential savings on energy bills.
They do, however, have a very clear difference when it comes to how they work and function.
How does a gas combi boiler work?
A gas combi boiler operates differently from a conventional boiler by providing both heating and hot water directly from one unit. When you turn on the hot tap or heating, the combi boiler instantly heats water from the mains, eliminating the need for a separate hot water tank.
This is different to a conventional boiler where it heats water and stores it in a cylinder, ready for use.
This means the combi boiler can offer hot water on demand with no waiting time, whereas the conventional system can run out of stored hot water, leading to grumpy and cold home dwellers! As you can see, this on-demand heating makes combi boilers more energy-efficient, as they only heat water as needed.
Do combi boilers use more gas or electricity?
Combi boilers primarily use gas as their energy source — not electricity. They are designed to efficiently heat water using natural gas, which is typically more cost-effective and energy-efficient than using electricity for the same purpose. While they can utilise a small amount of electricity for operating their controls, ignition systems, and pumps, the main energy consumption comes from gas.
This reliance on gas over electricity often results in lower operational costs compared to electric boilers. Therefore, while they do use some electricity, the dominant energy source for combi boilers is gas, making them a popular choice in areas with accessible gas supply.
Do you need a cold water tank with a gas combination boiler?
If you have limited space within your property, then what we’re about to say will be music to your ears!
You do not need a cold water tank with a gas combination boiler. This is because combi boilers are designed to provide hot water and heating directly from the mains water supply, eliminating the need for a separate cold water tank. This feature makes them a compact and convenient option — great for smaller homes.
How can a property benefit from a combi boiler?
If you’re considering a combination boiler installation for your home, you’ll be glad to know that gas combi boilers offer a host of advantages. However, as with any home improvement change, there are also drawbacks to consider.
Ultimately, we want you to make the most informed decision for your property. So, read on for everything you need before you start your search.
The advantages of a gas combi boiler
Space efficiency: As you now know, gas combi boilers don't require separate hot water tanks, freeing up valuable space in your home. Perfect for smaller properties or homes with limited storage space.
Energy efficiency: These boilers heat water directly from the mains on demand, which can reduce energy waste and potentially lower your energy bills, making them a cost-effective choice.
Instant hot water: With a combi boiler, hot water is delivered instantly and continuously, ensuring you never run out during showers or when running multiple taps.
Lower installation cost: Installation is often simpler and less expensive due to the absence of separate water tanks and less pipework, making them a more affordable option upfront.
Reduced maintenance: Combi boilers typically require less maintenance compared to conventional systems, thanks to their simpler design and fewer components.
The disadvantages of a gas combi boiler
- Limited hot water flow: Depending on the size of your home and the power of your gas combi boiler, it may struggle to supply enough hot water for multiple uses which can be a disadvantage in larger households with high water demand.
- Dependence on mains pressure: Their performance heavily relies on the mains water pressure. Low pressure can affect the efficiency of the boiler, impacting the flow of hot water.
- No immersion heater backup: Unlike conventional systems, combi boilers lack an immersion heater, so if the boiler fails, there's no backup for hot water.
- Shorter lifespan with hard water: In areas with hard water, combi boilers can suffer from limescale buildup more quickly, potentially reducing their lifespan if not regularly maintained.Is it worth replacing a system boiler with a combination boiler?
Is it worth replacing a system boiler with a combination boiler?
Replacing your system boiler with a combi boiler can be advantageous in some circumstances. Combi boilers offer space-saving benefits, making them a practical choice for homes with limited space. They can also be more energy-efficient, potentially reducing heating costs.
While future regulations may encourage greener alternatives, upgrading to a combi boiler can provide immediate benefits in terms of convenience and efficiency — especially if your current system is outdated or inefficient.
The cost of a combi boiler in the UK
The average cost of a gas combi boiler in the UK currently starts from around £2,000 to £2,500, including VAT.
However, the actual price can vary based on factors such as boiler capacity, installation complexity, and additional features. It's advisable to obtain quotes from trusted combi boiler installers to get a precise estimate tailored to your specific needs
How much does it cost to fit and install a combi boiler?
The cost of fitting and installing a gas combi boiler in the UK typically ranges from £500 to £1,000, depending on factors like the complexity of the installation, any necessary additional work, and the location of the boiler.
This cost is in addition to the price of the boiler itself. You may be able to get an all-in-one price, but this is something you’ll need to discuss directly with your chosen supplier.
Is it cheaper to run a system boiler or a gas combi boiler?
Generally, gas combi boilers are more cost-effective to run compared to system boilers.
Combi boilers heat water on demand, reducing energy waste, and potentially leading to lower heating bills. System boilers, on the other hand, require hot water storage, which can result in heat loss and higher energy consumption.
However, it’s important to remember that your specific cost savings will depend on factors like energy efficiency and your usage patterns.
How much does changing an existing water tank to a combi boiler cost?
Changing from an existing water tank system to a gas combi boiler in the UK typically costs around £2,000 to £4,000 on average, depending on the complexity of the installation.
Does this cost include the gas combi boiler tank?
The final cost can vary depending on several factors. To be sure of your overall expenses, we’d suggest that you go through a detailed gas combi boiler quote with a reputable installer to account for the specific needs of the installation.
Factors influencing the cost of a combi boiler installation
The cost of changing from a conventional boiler (with a tank) to a combi boiler in the UK includes several factors which can contribute to the overall expense:
Boiler cost: the cost of installation often includes the purchase of the gas combi boiler itself, which can vary based on the brand, model, and capacity of the boiler.
Installation complexity: the complexity of the combi boiler installation can significantly impact the cost. If extensive modifications are required to accommodate the new boiler, such as pipework adjustments or electrical work, this can increase the overall price.
Labour costs: labour costs for professional installation play a significant role in the total expense, and the price can depend on where you are in the UK. What’s important to remember is that qualified installers can ensure that the conversion is done correctly and safely.
Additional components and extras: depending on the specific installation requirements, additional components like flues or controls may be needed, adding to the cost.
Property location: the cost can vary based on the location of the property and how easy it is to perform an installation.
Boiler quality: Higher-quality and more efficient boilers may have a higher upfront cost, but remember that this can lead to long-term savings on energy bills.
Warranty and services: some installation packages may include warranties or servicing agreements, which can affect the overall cost. However, this may ultimately work in your favour if anything goes wrong with the boiler or it becomes inefficient.
How long should a combi boiler last?
A well-maintained gas combi boiler can have a lifespan of approximately 10 to 15 years or more. With that being said, regular maintenance and servicing can help prolong its lifespan for an efficient and reliable performance.
How to maintain a gas combi boiler
Wondering how to maintain and look after your gas combination boiler? Enhance its efficiency with these maintenance tips.
Keep up with annual servicing
Scheduling annual professional servicing helps identify and address potential issues early, ensuring safe and efficient operation.
2. Bleed your radiators
Regularly bleeding your radiators removes trapped air, preventing heating inefficiencies and ensuring even heating throughout your home.
3. Monitor your gas combi boiler’s pressure
Checking and adjusting boiler pressure as needed prevents potential damage and ensures the system's optimal performance.
4. Keep the ventilation clear
Proper ventilation around the boiler prevents overheating and helps maintain safe combustion.
5. Address any issues promptly
Promptly addressing any unusual noises, leaks, or irregularities with your installer prevents minor issues from escalating into costly repairs or safety concerns.
6. Protect your gas combination boiler from freezing
Protecting the boiler from freezing in cold weather prevents damage to its critical components and maintains its functionality.
7. Use a carbon monoxide detector
A non-negotiable! Installing a carbon monoxide detector ensures early detection of any gas leaks or combustion issues, enhancing your property’s safety.
Last updated on 16 Oct 2024 Last updated on 16 Oct 2024