Best Boilers Advice

Which is the best boiler? - Types of boilers



Boilers are an essential part of any home, which means that you’ve probably spent a lot of time installing and fixing them for customers. But it can be hard to decide which one to recommend, so we’ve put together the below comparison to help your customers better understand.

Combi boilers

A type of condensing boiler and the most commonly used system in the UK, the combi boiler provides hot water on demand and heats your central heating system.


• The combi boiler doesn’t require a hot water tank, as it heats the water as and when it’s needed meaning you're less likely to waste stored hot water and don't need any space for a tank

• They’re usually quicker and easier to install than other boiler types

Where can they be used:

Combi boilers are best suited for smaller homes with one or two bathrooms. Not only do they take up less space but they’re better for smaller dwellings where the hot water demand is less likely to be used by multiple taps at once. If multiple taps are turned on at the same time, the water can become suddenly cold.

Shop the combi boiler range here.

System boilers

A system boiler uses a water cylinder to store hot water and also heats the central heating system.


• Don’t need a cold water storage tank, many of the components are built into the system, so use less space than regular boilers and are easier, faster and neater to install

• Suitable for dwellings with a higher number of people in the household so hot water can be supplied at the same time from two or more outlets.

Where can they be used:

As these types of boilers can supply multiple hot water sources at once, they’re perfect for homes with more than one bathroom. Because the hot water supply is limited to what's stored in the cylinder, once it runs out the water needs to heat up again.

Browse our range of system boilers here.

Regular boilers

Regular boilers, also known as Heat Only or Conventional boilers use a cold water storage tank, usually stored in the loft, to feed a cylinder where the water is heated and stored until required.


• Requires more room than other boiler types as it uses a cold water storage tank and a hot water cylinder

• A good option for areas with low water pressure as the tank is usually placed in the loft

• Hot water is stored in a cylinder, so once it runs out it will need to be heated again.

Where can they be used:

Due to their size and the number of elements required for this system, it’s better to install regular boilers in larger homes or homes that already have this type of system installed as a retrofit or update. They are also great for homes with multiple bathrooms as more than one hot water source can be used at once without any heat loss.

Explore our range of regular boilers.

Different fuels

There’s a few different fuel types that work with these boilers, the fuel type is usually determined by the area the house is in.

Gas Boilers

• Lower average cost than electric

• Needs to be connected to the gas grid, so not suitable for homes without access

LPG (Liquefied Petroleum Gas) Boilers

• Alternative to natural gas for those that can’t access the mains grid

• Provided via tanks, which can be stored outside or underground

Electric Boilers

• Have an incredibly high efficiency, usually of around 99%, so less energy and money is wasted

• Boilers are usually cheaper and easier to install

• Reliant on electricity, which can be more expensive

Oil Boilers

• On average more expensive than gas

• Usually delivered to the home

• Tanks need to be installed on the property, usually outside

Browse our full range of boilers here.