Choosing the right new boiler for your home isn’t always straightforward. With so many options available, the decision often comes down to the size of your property, your hot water demand, and your budget.
For example, the heating needs of a 2-bed flat in Worthing are very different from those of a 4-bed family home in Littlehampton. In this guide, we’ll compare the most suitable boiler types for each situation, helping you make an informed decision.
The Boiler Options
There are three main boiler types to consider:
- Combi boilers – Compact, efficient, and supply hot water on demand without the need for a cylinder or tank.
- System boilers – Require a cylinder for storing hot water, ideal for homes with higher demand.
- Regular (conventional) boilers – Use both a cylinder and a tank, suited to large properties with traditional heating systems.
Our in-depth boiler types guide explains the differences in more detail.
Best Boiler for a 2-Bed Flat
If you live in a smaller property like a flat or maisonette, space is often limited. You’ll also likely have just one bathroom and relatively low hot water demand.
In this case, a combi boiler is usually the best option. Here’s why:
- Compact size – No need for a hot water cylinder or loft tanks.
- Instant hot water – Perfect for single bathrooms and kitchens.
- Energy efficiency – Only heats the water you use, helping reduce energy bills.
- Cost-effective – Lower installation costs compared to system or regular boilers.
For flats, popular combi boiler sizes are usually between 24–28kW, which comfortably cover heating and hot water needs without wasting energy.
If you’re unsure whether to upgrade now, our article on 7 signs you need to replace your boiler may help you decide.
Best Boiler for a 4-Bed House
Larger homes with multiple bathrooms and greater hot water demand need a different solution. A system boiler is typically the best choice for a 4-bed property, offering:
- High hot water capacity – Ideal for families who may be showering, running taps, and using appliances at the same time.
- Good water pressure – Works well with modern mains-fed systems.
- Scalability – Can be paired with unvented cylinders for even greater supply.
A regular (conventional) boiler may also be suitable for older 4-bed homes with existing tanks and pipework, but many homeowners opt for a system boiler when upgrading.
Boiler sizes for a 4-bed house usually range from 30–35kW, depending on the property’s insulation and hot water usage.
For cost guidance, see our New Boiler Cost Guide 2025.
Local Expertise in West Sussex
At NJ Lees Heating & Plumbing, we install and service all types of boilers across West Sussex, including Worthing, Shoreham-by-Sea, Rustington, Littlehampton, and Ferring.
If you’re looking for advice tailored to your home, our Gas Safe registered engineers can recommend the best boiler type and size for your exact requirements.
Get Expert Boiler Advice Today
Whether you live in a small flat or a large family home, choosing the right boiler makes all the difference. Our team can provide a free, no-obligation quote and guide you through every step of the process.
Contact us today for expert advice on the best boiler for your 2-bed flat or 4-bed house in West Sussex.