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What kind of fuel does your boiler use?
When should you replace your boiler?
With regular servicing, some models can withstand many years of use. However, there are some circumstances where the overall cost of repairs determines that a new boiler installation is a must. Here are some signs to look out for:
Rising energy bills
Your heating bills are suddenly more expensive with no explanation — a sign your boiler is losing efficiency.
Frequent breakdowns
Frequent issues require you to have it serviced more than once a year — repairs are costing more than a replacement.
Unusual noises
Your boiler and radiators are making unusual banging, whistling or gurgling noises — a sign of internal problems.
Strange smells
Your boiler smells sulphurous when it’s on — this could indicate a dangerous gas leak and needs urgent attention.
Leaks
Your boiler is leaking water — this can cause serious damage to your home and means the boiler needs replacing.
Old age
Your boiler is over 10-15 years old — modern A-rated boilers can save you money on energy bills.
Should you replace your boiler?
Use our scoring table to help you decide.
| Question | YES | NO |
|---|---|---|
| Have you repaired your boiler twice or more in 1 year? | 10 | 0 |
| Do you want to remove a hot water tank? | 10 | 0 |
| Do you have an inefficient back boiler? | 10 | 0 |
| Is your boiler over 7 years old? | 5 | 0 |
| Is your boiler costing you more in energy bills? | 5 | 0 |
| Is there potential for your boiler to stop working? | 5 | 0 |
| Is your boiler out of warranty? | 5 | 0 |
| Do you think your boiler isn’t working properly? | 5 | 0 |
- 0 – No, your boiler is probably fine
- 5+ – Yes, worth considering a replacement
- 10+ – Definitely yes, replace as soon as possible!
What type of new boiler should you choose?
Combi Boiler
Combination boilers are the most popular type in the UK. They provide instant hot water and efficient central heating without requiring separate tanks or cylinders. Perfect for small to medium homes.
Pros: instant hot water, compact design, lower install cost, no tank needed.
Cons: one user at a time, less ideal for large homes, more internal parts.
System Boiler
System boilers work within a closed system using a hot water cylinder. Perfect for larger homes with multiple bathrooms where high hot water demand is needed simultaneously.
Pros: great for large homes, multiple bathrooms, works in low pressure, no loft tank needed.
Cons: needs cylinder space, higher install cost, wait to reheat.
Regular / Heat-Only Boiler
Also known as conventional boilers, these store hot water in a cylinder or storage tank. They produce hot water very efficiently and work well with large households with high demand.
Pros: high hot water output, multiple taps at once, works well in large homes.
Cons: needs cylinder & tank, hot water can run out, complex installation.
What size boiler do I need?
| Home size & hot water demand | Combi boiler output | Recommended type |
|---|---|---|
| 1–3 bedrooms, 7–10 radiators, 1 bathroom | 20–29kW | Combi Boiler |
| 3–4 bedrooms, 11–15 radiators, 1–2 bathrooms | 30–35kW | Combi or System |
| 4+ bedrooms, 16–20 radiators, 2+ bathrooms | 36–60kW | System or Regular |
Top-rated new boiler brands
We only install the best boiler brands in the UK — all backed by industry-leading warranties.
The future of home heating
Heat Pumps
Heat pumps absorb natural heat from the ground, water, or air and use it to warm your home. They use electricity instead of gas — resulting in no additional carbon emissions. More durable than gas boilers and some offer cooling in summer too.
Electric Boilers
Electric boilers work very similarly to gas ones but use electricity to heat the water. Usually more compact than gas versions whilst remaining just as efficient. A great option for homes not connected to the gas network.
Solar Heating
Solar thermal heating systems use heat from the sun to warm your household water. They reduce fossil fuel usage considerably and can work alongside your existing boiler to lower your energy bills significantly.
Frequently Asked Questions
Are boiler replacements the right option?
Having an inefficient boiler can lead to high gas bills and negatively impact the environment. Upgrading your boiler can save you money on energy bills.
It’s best to replace your boiler before the winter months, as most homes have their heating on during this time. If you’re concerned about energy costs, consider investing in a smart thermostat to further reduce gas and electricity usage.
How easy is getting a new boiler?
It couldn’t be simpler. Gone are the days of waiting for a surveyor to visit your home. Now, you can order a boiler upgrade from anywhere in the world — from your phone, tablet, or desktop computer. Get a boiler quote online in just 20 seconds.
How long does it take to replace a combi boiler?
A simple swap from an old combi boiler to a new combi boiler is straightforward and usually takes 4–6 hours for a Gas Safe engineer to fit.
If you want to replace a system boiler with a combi boiler, this can take longer due to the extra work disposing of the old water tank. Back boiler to combi conversions typically take 2 days.
Is it worth replacing a 20 year old boiler?
Yes — older boilers such as back boilers are significantly less efficient compared to newer ones, with efficiency dropping to 50-60% after 20 years. A modern A-rated boiler operates at over 90% efficiency.
It’s recommended to consult with a Gas Safe engineer to determine if replacement is necessary, but in most cases it absolutely is worth it for the energy savings alone.
Are boilers expensive to replace?
Installing a modern energy-saving boiler may lead to long-term savings on energy bills, making the investment much better value over time. Get a quote to see your fixed price.
What is included with a replacement boiler installation?
Before installation:
- We assess your heating and hot water demands
- We select the best size boiler for your home
- You book an installation date
During installation:
- We remove your old boiler
- We run necessary gas, water and electricity lines
- We clean your central heating system
- We install and connect the new boiler
After installation:
- We commission the boiler to ensure it’s working correctly
- We set up the controls and thermostat
- We register your Gas Safe installation and manufacturer warranty
What to do next to get fast boiler replacement in 24 hours?
Using Boilercentral.com’s online quotation system, answer 9 simple questions about your home and water usage to find the fuel and boiler that’s right for you.
Once we’ve received your information, we’ll provide a list of boilers we can install — from budget options right through to mid and top-end models. Choose the right one for your budget and we can be there as soon as tomorrow!
Before you choose, our guide to what to consider when buying a boiler explains the key decisions, and how to buy a boiler online covers what to check before ordering. If you are replacing an older system, read our full guide to boiler replacement and new boilers.
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