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Boiler Types Explained

If you’re looking to install a brand new boiler or replace a broken down boiler, you’ll need to select a boiler suitable for your property.

There are a few key things you should consider but the following summary should help you make an informed decision. If you’re still unsure of which boiler type to choose after reading, you can call us at anytime. Our friendly team of gas safe engineers are on hand to answer any questions you may have and help you choose the right boiler for your home or business.

Combi Boilers

A combi or combination boiler is one of the most common boiler types for residential properties. It controls both hot water & central heating, and due to its energy efficiency is an ideal choice for environmentally-conscious homeowners.

A combi boiler works by taking water directly from the mains and heating it using a gas burner and heat exchanger. The system allows hot water to be generated almost instantly, meaning there is no need to store excess water and a cylinder or water tank is not required. This cuts down on the installation time and ultimately saves space in your home.

Advantages of combination boilers

– Instant access to hot water and central heating

– Compact choice for homes with limited space

– Quick and simple installation process

Disadvantages of combination boilers

– Not ideal for larger homes or homes with multiple bathrooms

– May not suit homes with low water pressure

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System Boilers

The vast majority of UK households rely on a combi or combination boiler for hot water and central heating. However, a system boiler could be more appropriate if your home has multiple bathrooms or wetrooms.

A system boiler features a separate cylinder for storing hot water and most of the major heating & water components (e.g. the water pump and expansion vessel) are built in. There is no need for a header tank to be installed in the attic or boiler room and hot water is available immediately upon turning the tap.

In a system boiler, cold water enters directly from the mains supply. The water is then heated via a heat exchanger and transported to a hot water cylinder, where it is stored until required.

Because there is a large reservoir of hot water always available, a steady supply is always maintained. This means that system boilers are a great choice for homes with multiple bathrooms or homes with limited space.

Advantages of system boilers

– Low running costs

– Compact design

– Constant supply of hot water

Disadvantages of system boilers

– Boiler insulation is required to prevent heat loss

– May have to wait for hot water to be reheated if hot water runs out

– The size of the hot water of cylinder dictates how much water you can use, before running out


Conventional Boilers

A conventional, traditional or heat only boiler is the ideal choice for larger homes or homes with low water pressure. It features a hot water storage cylinder as well as a large water tank, which is typically stored in the attic, loft or airing cupboard.

In a conventional boiler system, cold water is heated in the hot water storage cylinder. The system is either open vented, which is subject to atmospheric pressures, or sealed to accommodate less water loss, leakage or evaporation. The water tank stored in the loft means that an optimal water level can be maintained whilst the pump helps to circulate hot water to all of your home’s radiators.

Conventional boilers are able to support multiple bathrooms at the same time. If you have a large family or live in a shared house, this could be the ideal heating solution for you. Conventional boilers also compatible with solar thermal systems, making them a great energy-efficient option for homeowners and business owners.

Advantages of conventional boilers

– Perfect for homes with low water pressure

– Suitable for installation in homes with older heating systems

– Delivers hot water to multiple bathrooms, without compromising water pressure or temperature

Disadvantages of conventional boilers

– Requires additional space for a hot water cylinder and water tank

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We tailor our boiler installation, so you can rest assure that we will find the best boiler type for your property. We take into consideration the hot water demand, gas supply, heating load and more. We offer a free consultation and quote service for customers living in Bristol and the South West – We visit any homeowner or business owner who is considering installing a new boiler or having their current heating system upgraded.

All of our heating and plumbing services are carried out by fully qualified, gas safe engineers and our home improvements are finished on time and on budget.

To enquire about our heating and plumbing services, fill in our contact form and we will be in touch.

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We are always happy to discuss any of our products and services in more detail, feel free to call us at 0800 6893602 or email us at Alternatively, please fill in the contact form below and we will contact you.

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