If you are planning to replace your heating system, one of the first steps is to compare boilers properly. With so many brands, models and boiler types available in the UK, it can be difficult to know which option is best for your home. The right boiler should suit your property size, hot water demand, budget and long-term efficiency goals. In this guide, we will help you compare boiler types, brands and features so you can make a confident decision – and here in Exeter and across Devon, where many areas have harder water, we’ll flag where that affects your choice too.
Step 1: Compare Boiler Types
Before comparing brands, you need to choose the right boiler type. In the UK, the three main types are:
- Combi boilers
- System boilers
- Regular (conventional) boilers
Combi Boilers
Combi boilers provide heating and hot water directly from the unit, without a hot water cylinder or cold water tank.
Best for:
- Flats and small to medium homes
- Properties with one bathroom
- Homes with limited storage space
Pros:
- Compact design
- Lower installation cost
- Instant hot water
Cons:
- Can struggle with multiple showers running at once
System Boilers
System boilers work with a separate hot water cylinder but do not require a cold water tank.
Best for:
- Medium to large homes
- Households with two or more bathrooms
- Families with higher hot water usage
Pros:
- Better for multiple taps or showers
- Consistent hot water supply
Cons:
- Requires space for a cylinder
Regular Boilers
Regular boilers require both a hot water cylinder and a cold water storage tank, usually in the loft.
Best for:
- Older properties
- Large homes with very high demand
- Homes already set up with a traditional system
Pros:
- Can supply several bathrooms at once
- Suitable for older pipework systems
Cons:
- Takes up more space
- Typically higher installation cost
Step 2: Compare Boiler Brands in the UK
Once you know the type, you can compare leading boiler brands.
Here are some of the most trusted brands in the UK:
| Brand | Known For | Typical Warranty |
|---|---|---|
| Worcester Bosch | Reliability and quiet operation | 7–12 years |
| Vaillant | High efficiency and smart controls | 5–10 years |
| Ideal | Good value and compact models | 5–10 years |
| Baxi | Affordable and simple designs | 5–10 years |
| Viessmann | Modern design and high efficiency | 7–10 years |
Premium brands may cost more upfront but often provide longer warranties and fewer breakdowns.
Step 3: Compare Boiler Efficiency
All modern boilers sold in the UK are condensing boilers and must be highly efficient.
Most new boilers are:
- A-rated
- Over 90 percent efficient
Higher efficiency means:
- Lower energy bills
- Reduced carbon emissions
- Better long-term savings
When you compare boilers, check the ErP efficiency rating.
Step 4: Compare Boiler Size (kW Output)
Boiler size refers to power output in kilowatts (kW), not physical size.
Choosing the correct output is essential.
| Property Size | Typical Boiler Output |
|---|---|
| 1–2 bed flat | 24–28kW |
| 3 bed house | 28–32kW |
| Large home | 32–40kW |
An undersized boiler may struggle to heat your home. An oversized boiler wastes energy and increases running costs.
A professional installer will calculate the correct size based on:
- Number of radiators
- Property size
- Hot water demand
- Insulation levels
Step 5: Compare Boiler Installation Costs
Boiler installation costs vary depending on type and complexity.
| Boiler Type | Typical Installed Cost |
|---|---|
| Combi boiler | £2,000–£3,500 |
| System boiler | £2,300–£4,000 |
| Regular boiler | £2,500–£4,500 |
Costs increase if:
- You change boiler type
- The boiler location moves
- Pipework requires upgrades
- A consumer unit or gas supply upgrade is needed
For a tailored quote, you can start here:
Step 6: Compare Warranties
Warranty length can be a key deciding factor.
Most quality boilers offer:
- 5 years standard
- 7–10 years with approved installers
- Up to 12 years on premium models
A longer warranty often reflects manufacturer confidence in build quality.
Always ensure annual servicing is completed to keep the warranty valid.
Step 7: Compare Smart Compatibility
Modern boilers can integrate with smart heating controls such as:
- Hive
- Nest
- Tado
Smart controls allow:
- Remote heating adjustments
- Improved efficiency
- Scheduled heating
- Lower energy use
If you want future-proof heating, compare boilers that support smart systems.
Which Boiler Is Best Overall?
There is no single best boiler for every home. The best choice depends on your property and usage.
Quick comparison summary:
- Small home, one bathroom: Combi boiler
- Larger family home: System boiler
- Older property with tanks: Regular boiler
- Maximum reliability: Worcester Bosch or Vaillant
- Best value: Ideal or Baxi
The key is matching the boiler to your home, not just the brand.
Compare Boilers With Expert Advice
At Home Exeter, we help homeowners compare boilers based on:
- Property size
- Heating and hot water demand
- Budget
- Long-term energy efficiency
- Future plans
We provide honest advice and transparent pricing so you can choose the right system with confidence.
To get started, request a fixed price quote here: https://homeexeter.co.uk/get-your-boiler-quote/
Frequently Asked Questions About Comparing Boilers
What is the most reliable boiler brand in the UK?
Worcester Bosch and Vaillant are widely regarded as highly reliable.
Is a combi boiler better than a system boiler?
It depends on your home size and water demand. Combi boilers are ideal for smaller homes.
How long do boilers last?
With annual servicing, most boilers last 12 to 15 years.
Should I compare price or warranty first?
Warranty and reliability are often more important long-term than the lowest upfront price.
Can I switch boiler type?
Yes, but it increases installation cost due to system changes.
Do all boilers require annual servicing?
Yes. Annual servicing keeps the system safe and protects the warranty.
