Gas Boilers are an essential part of any home or office. They provide heat via a central heating system as well as provide hot water to your bathrooms and kitchen. Boilers can be run on different types of fuel, including traditional gas, so they can be complicated pieces of equipment which is why we’ve put together this guide to help guide you in the right direction.

The Different Types of Boiler Available

Combi Boilers

The most common boiler you’ll come across is the combi system. The combi boiler is able to heat water directly from a mains supply meaning you don’t need a water storage tank located somewhere within the building. The heating provided from a combi boiler is some of the most efficient as it is only heating water on demand.

Other benefits include:

  • Compact in size for location in smaller properties
  • The use of less pipework is required typically making installation cheaper
  • Combi boilers are fast and efficient, saving on energy bills
  • Can be run via an electricity supply instead of gas

Conventional Boilers

Suitable for larger commercial environments is the conventional boiler, also known as the open vent or regular boiler. These are great for buildings where a lot of hot water is needed at the same time such as in a bathroom and shower block. Both a hot and cold water storage tank will be required within the building but these are much easier to place than in small homes. Boiler installation can be carried out by any qualified Gas Safe engineer. If you’re currently in an older property, you’re much more likely to have this type of boiler.

The benefits of a conventional boiler are;

  • If you’re replacing like for like, a conventional system will be cheaper as all of the required ancillaries are already in place such as the water cylinders, tanks and pipework.
  • Hot water is supplied to all taps simultaneously

Biomass Boilers

Another popular option is the biomass boiler. This is an environmentally friendly option, considered to be carbon neutral which uses a type of pellet for fuel instead of gas. The fuel is commonly derived from plant matter although other sources can utilise animal, food and industrial waste matter.

To supply hot water, these pellets are fed into a chamber where they are ignited by an electric probe. Hot gasses are collected and then passed through a heat exchanger so that heat is transferred from these combustion gasses and into the water circulating within the central heating system.

Advantages of a biomass boiler include;

  • A high level of energy efficiency
  • A reduction in carbon dioxide emissions. This may go some way to satisfy BREEAM requirements if you’re going for accreditation.
  • No need for a water cylinder or tank


Even the most modern boilers require regular maintenance. Each type of boiler listed will be familiar to a qualified Gas Safe company so they will be in a position to offer an ongoing maintenance and aftersales service post installation.

A new boiler can do wonders for your environment and reducing your energy bills so consider replacing or upgrading your old model.