Boiler Types
Identify the type of boiler you need for your situation
Factors … Boiler Types explained … Combi Boilers … System Boilers … Regular Boilers
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Factors affecting your choice of Boiler
The main factors that are likely to affect your final boiler choice are:
- Hot Water requirements – How the boiler heats the Domestic Hot Water (DHW) that powers your baths, showers and taps.
- Type of Fuel – Which fuel the boiler requires – Gas, LPG or Oil.
- Boiler Mount – Whether you want the boiler to be mounted on a Wall or Floor (Freestanding)
- Boiler Location – Where you want the boiler installed. Internal (Loft, Kitchen etc). External (Garage, Garden etc)
Watch the video to learn about Boiler types.
Combi Boilers
The key characteristics of a Combi Boiler are:
- Domestic Hot Water – Provided by heating the mains cold water supply as it passes through the boiler when you turn on an outlet tap or shower.
- Type of Fuel – Available for Gas, LPG or Oil.
- Boiler Mounted on – Wall (Gas/LPG). Floor (Gas/LPG/Oil).
- Boiler Location – Internal incl loft/garage (Gas/LPG). External (Oil).
- Advantages – No Cold Water Storage Tank or Hot Water Cylinder needed, so you save space/cost. Simple, compact boiler construction. Lower DHW running cost due to no DHW storage.
- Best suited to – Small to medium sized homes with good water pressure
Watch the video for an overview of Combi Boilers.
System Boilers
The key characteristics of a System Boiler are:
- Domestic Hot Water – Provided from water stored in a Hot Water Cylinder under mains water pressure. Heated indirectly by passing hot water from the boiler through a coil in the Cylinder.
- Type of Fuel – Available for Gas, LPG or Oil.
- Boiler Mounted on – Wall (Gas/LPG). Floor (Oil).
- Boiler Location – Internal incl loft/garage (Gas/LPG). External (Oil).
- Advantages – No Cold Water Storage Tank needed (save space/cost). Main Heating parts stored within boiler (quicker/easier to install). Water storage means lots of hot water available for use.
- Best suited to – Homes with more than one bathroom.
Watch the video to learn about System Boilers.
Regular Boilers
Also known as ‘Traditional’ or ‘Heat only’, existing older systems typically used Regular Boilers. Their key characteristics are:
- Domestic Hot Water – Mains cold water feeds a Cold Water Storage (CWS) tank at high level (usually in the loft). This feeds a HW Cylinder to provide DHW at the taps. DHW is heated indirectly by passing hot water from the boiler through a coil in the Cylinder.
- Type of Fuel – Available for Gas, LPG or Oil.
- Boiler Mounted on – Wall (Gas/LPG). Floor (Gas/LPG/Oil).
- Boiler Location – Internal incl loft/garage (Gas/LPG). External (Oil).
- Advantages – Easily replace existing Regular boilers as components already in place (cost/speed). Lower system pressure than Combi/System boilers means more suited to older radiators. Water storage means can feed many outlets concurrently.
- Best suited to – Existing homes which already have this type of boiler. Homes with multiple bathrooms or require concurrent showers/baths. Homes with low mains water pressure.
Watch the video to learn about Regular Boilers.
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