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Guide to Different Types of Gas Boiler

Guide to The Different Types of Gas BoilerIf you’re thinking about replacing or upgrading your gas boiler, it’s important to understand a bit more about the difference between the different types of gas fired boiler available, here’s our quick guide to the different types of gas boiler.

We do offer a Free No Obligation home survey & will discuss all options and costs with you to ensure you get the right boiler for your needs at the right price.

Types of  Gas Boilers

There are three main types of gas fired boiler to choose from:

  • Combi Gas Boilers – Combi (or combination) boilers are the UK’s most popular type of boiler for gas central heating and domestic hot water. As with other types of boiler, they provide heat to your radiators. Where a ‘combi’ differs though is that it only heats hot water for your taps on demand, for example when a hot tap is turned on or you run a hot shower. So you’re not wasting energy by keeping a tank full of water heated when it’s not needed. Other pros of combi boilers are that they don’t require extra space for a water tank, and they deliver water to your taps at mains pressure – which makes for a more powerful shower.
  • Conventional Gas Boilers – Conventional boilers are often found in older houses. The heating system includes a cold water tank (usually in the loft), a separate expansion cistern and a pump. Installing a new conventional boiler in your home is a pretty straightforward job. Most conventional boilers can be installed on existing systems making them a very versatile option. They’re also easy to use.
  • System Gas Boilers – System boilers are particularly suitable for heating larger houses that use more hot water – (i.e. houses that have more than one bathroom). A system boiler pumps hot water to the radiators and to the hot water storage tank or cylinder (usually in the airing cupboard or loft). With a system boiler, you can run more than one tap at the same time, so there won’t be a problem if you want to do the washing up while someone else is having a bath.

Combi Gas Boiler

  • Combi boilers are the UK’s most popular type of boiler
  • Hot water for your taps & central heating system is supplied directly from the boiler
  • Ideal for smaller homes & homes with one bathroom
  • Can be an economical option, as combi boilers only heat the water you use
  • Provides unlimited hot water on demand
  • A great space-saving solution with no need for a separate cold water tank or hot water cylinder
  • Depending on your mains water pressure, the flow of hot water could be reduced if you’re using more than one tap at the same time
  • Water can sometimes take a few seconds to heat up

Conventional Gas Boiler

  • They send heated water to your radiators and a hot water cylinder
  • Better suited to larger homes, especially those with more than one bathroom
  • Can provide hot water to more than one tap at the same time
  • An electrical immersion heater can be fitted to the hot water cylinder as a back-up, should your boiler breakdown
  • Hot water is limited to the capacity of the cylinder, so if it runs out you’ll need to wait until it heats up again
  • Space is required for a hot water cylinder and a cold water tank which is usually located in the loft
  • You’ll need programmable controls to heat the water in the cylinder, so it’s ready for when you need it

System Gas Boiler

  • System boilers work in a similar way to conventional boilers but have some external parts already built-in
  • There’s no need for a separate feed and expansion tank (usually located in the loft)
  • Ideal for larger homes and homeowners who want extra storage space in their loft
  • Hot water can be supplied to more than one tap at the same time
  • An electrical immersion heater can be fitted to the hot water cylinder as a back-up, should your boiler breakdown
  • Hot water is limited to the capacity of the cylinder, so if it runs out you’ll need to wait until it heats up again
  • To ensure hot water is available for when you need it, you’ll require programmable controls to heat your water in advance