New Boiler Installation

Boiler Types Explained

Choosing the right boiler starts with understanding the three main types available—combi, conventional, and system boilers—each designed to suit different homes and lifestyles.

• Combi Boilers
  Combi (combination) boilers offer a space-saving solution, ideal for smaller properties or those with limited storage. They heat water directly from the mains, so there’s no need for separate hot water cylinders or cold water tanks. This makes them well-suited for households with one bathroom, looking for efficiency and convenience.

• Conventional Boilers
  Also called ‘regular’ or ‘heat only’ boilers, conventional boilers are paired with an external hot water cylinder and often a cold water storage tank in the loft. These systems are perfect for larger or older homes that have more than one bathroom and higher simultaneous hot water demand.

• System Boilers
  System boilers are a middle ground—they use a separate cylinder to store hot water but don’t require a traditional loft tank. Everything else is built into the boiler itself, making installation a bit simpler than conventional setups. They’re a good fit for homes with multiple bathrooms and households where strong water pressure is important.

Not sure which is best for your property? Our heating engineers are always happy to guide you through the options, making sure you get the right fit for your budget and needs.

Selecting the perfect boiler depends on the size of your home and your unique heating and hot water needs. Here’s a quick guide to help you make an informed choice:

• Combi Boilers: Ideal for smaller homes or flats with one bathroom, combi (combination) boilers are wonderfully compact. They provide both heating and hot water directly from the unit, so there’s no need for a separate hot water cylinder—great if you’re short on space.

• Conventional Boilers: Also known as ‘regular’ or ‘heat only’ boilers, these work alongside a separate hot water cylinder and are typically found in older or larger homes. They’re well-suited if you have more than one bathroom or a high demand for hot water at multiple taps simultaneously.

• System Boilers: System boilers sit somewhere in between, using a separate cylinder for hot water but with most major components built into the boiler itself. These are perfect for homes with more space and higher hot water needs, but without the need for a cold water tank in the loft.

Still unsure which boiler is right for you? Our knowledgeable team is happy to assess your home and talk you through the options, ensuring you select the ideal system for your household’s comfort and efficiency. Feel free to get in touch for tailored advice.

When you book a new boiler installation with us, our Gas Safe registered engineer will begin by carefully draining your central heating and hot water system. This allows them to safely disconnect and remove your old boiler with minimal disruption to your home. To ensure your new boiler works at its best, the engineer will clean out the system and clear away any built-up debris from the pipework.

Next, your replacement boiler will be professionally installed, and all necessary safety and performance checks will be carried out. Once the installation is complete, the engineer will walk you through your new boiler and show you how to use any updated controls or features, making sure you’re comfortable and confident with your new heating system. If you have any specific requirements or want to look at upgrades, such as smart controls or thermostatic radiator valves, we can discuss options to further improve your heating efficiency.

After your installation, we don’t just leave you to it. Our team is always on hand for any questions you might have, and we’ll help you keep your boiler running smoothly with a comprehensive aftercare service. We offer a 2-year parts and labour warranty on all new boilers and recommend annual servicing to keep your warranty valid and your system running efficiently. You can also explore our boiler cover plans, which include an annual service for convenience and peace of mind.

If you have more questions or want to discuss your installation, just get in touch—our team is always happy to help.

When you book a boiler installation with Gasway, you can expect a thorough and professional service from start to finish. Here’s what’s typically included:

• System Preparation: Our expert engineers will carefully drain and prepare your existing central heating and hot water system, ensuring everything is ready for the new installation.
• Removal of Your Old Boiler: We’ll safely disconnect and take away your old boiler, making space for your upgraded system.
• System Cleaning: To help your new boiler run efficiently, we clear out any impurities or sludge from your pipework.
• Expert Installation: Your new boiler will be installed to manufacturer specifications, with attention to detail at every stage.
• Guidance and Handover: Once fitted, we’ll walk you through your new boiler setup—including the controls—so you know exactly how everything works.
• No Mess Left Behind: We’ll remove all packaging and waste, leaving your home as tidy as we found it.

You can rest assured that we’re here to answer any questions throughout the process—and after—so you can enjoy reliable heating and hot water with complete peace of mind.

We understand that investing in a new boiler is a significant decision, so we offer several flexible ways to pay—each designed to suit your budget and needs. You can choose from a variety of finance plans, including:

• Interest free options: Spread the cost over up to 1 years at 0% APR* with no deposit required (subject to status).
• Long-term repayment plans: Prefer smaller monthly payments? Opt for terms of up to 10 years at a competitive fixed rate (subject to approval).
• No upfront deposit: Begin your installation without any large initial payments.

Our team is always here to discuss your finance options and help you find the right plan for your home, ensuring the process is simple and stress-free.

If you want to explore these payment choices in more detail, visit our Finance Plans page or speak with one of our advisors.

The time it takes to fit a new boiler can vary depending on your specific requirements, but most installations are completed within 1 to 3 days. If you're replacing your current boiler with a similar model in the same location, the process is typically quicker and more straightforward.

However, if your upgrade involves changing boiler type—such as swapping a conventional boiler for a combi—or relocating the boiler to a new area of your home, you can expect the installation to take a little longer, as this may require additional work like updating pipework.

Not sure which boiler is right for your home or how it might affect installation times? Our team is happy to guide you through your options and recommend the best solution to suit your needs and schedule.

Every home is different and your heating and hot water needs will always be unique to you.

Use our Boiler quotetool to find the best boiler deals for you based on your specific home heating requirements.

What’s included in your boiler replacement cost?

When you get a quote from us, the price always includes both your new boiler and the full installation service—no hidden surprises. Whether you’re arranging your replacement online or speaking directly with our team, you’ll receive a clear, all-in-one quote.

We know that replacing your boiler can feel daunting, so we’re here to guide you every step of the way. If you’re unsure whether you need a new boiler, a repair, or a complete replacement, our experts are happy to help you weigh up your options and find the best solution for your home.

For a detailed breakdown of what to expect during installation, or if you’d like more information about how we work, get in touch or check our helpful guides.

Yes, Gasway will remove your old boiler and recycle it, we will also take away all packaging from the new boiler and leave your home clean and tidy.

A boilers flue is the pipe usually on top of the boiler going outside, usually round but can be square in some cases.

Yes, If you are booking a new boiler installation you can take advantage of a discounted cover plan which includes a FREE annual service. Ask the installations team, or your surveyor for more information.

Regular boiler servicing is essential to keep your system running efficiently, help prevent unexpected breakdowns, and ensure your warranty remains valid. The cost of a boiler service can vary depending on the type and age of your boiler, as well as your location.

With Gasway’s cover plan, your annual service is included at no extra cost, offering you peace of mind and helping to avoid any surprise expenses. You can choose a one-off service or enjoy the benefits of annual servicing with a cover plan tailored to your needs. If you’re unsure which option is best, our friendly team is always happy to advise further.

Yes, All our engineers are gas safe registered and verified with the gas safe register. To check an engineer for peace of mind please visit www.gassaferegister.co.uk

Every situation is different and our team will happily advise to what's best for you. If you don't have a boiler cover plan, some a repair can sometimes be as expensive as a new boiler. Even with a cover plan you could easily have more problems with a previously repaired boiler further down the line.