Conventional Boilers

Conventional boilers are perfect if you require more hot water than
can be provided by a combi boiler.

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Conventional Boilers

At Boilerhut, we offer comprehensive installation of conventional boilers across the UK.

Also known as regular boilers or open vent boilers, conventional boilers are the most traditional form of boiler installed in the UK and comprise of several components.

For many years, conventional boilers were one of the only boiler options and were installed into many UK homes as standard when they were built.

Is a conventional boiler right for my home?

This type of boiler is suited to larger homes with a higher number of radiators and multiple bathrooms. However, there are several considerations to make before choosing this type of boiler. If you are replacing an existing boiler, it is usually recommended that you have a like-for-like swap. The reason for this comes down to the layout of your heating system and how long a new boiler will take to install.

Swapping an existing conventional boiler for another conventional boiler is easier and cheaper than replacing it with a combi boiler. Conventional boilers need a hot water cylinder and cold water tank, so you will need the available space.

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Our Conventional Boiler Range

Viessmann Vitodens 100-W - Heat Pump vs Gas Boiler | Boilerhut

Viessmann Vitodens 100-W Gas Conventional Boiler

  • Size: 11kW, 19kW, 25kW, 32kW
  • Efficiency: 94%
  • Warranty: 12 Years

Worcester Bosch Greenstar i Gas Conventional Boiler

  • Size: 25kW, 30kW
  • Efficiency: 94%
  • Warranty: 10 Years
Vaillant boiler F75 error | Boilerhut

Vaillant ecoFIT pure Gas Conventional Boiler

  • Size: 25kW, 30kW, 35 kW
  • Efficiency: 94%
  • Warranty: 2 Years
Navien LCB700 Regular Boiler | Boilerhut

Navien LCB700 Blue Flame Oil Conventional Boiler

  • Size: 21 kW, 28 kW, 36 kW
  • Efficiency: 93%
  • Warranty: 7 Years

Worcester Bosch Danesmoor Oil Conventional Boiler

  • Size: 18kW, 25kW, 32kW
  • Efficiency: 94%
  • Warranty: 10 Years

Worcester Bosch Greenstar i LPG Conventional Boiler

  • Size: 25kW, 30kW
  • Efficiency: 94%
  • Warranty: 10 Years

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Frequently asked questions

Open vented boiler systems

Conventional boilers are open vented boiler systems. In an open vented boiler system, the system utilises a feed and expansion tank to supply the central heating circuit with water and accommodate the expansion of water when it is heated by the boiler.

The feed and expansion tank is usually situated in the loft, where it forms the highest point of the central heating system and feeds into the boiler using gravity.

It is for this reason that the cold water tank is installed in the loft as high as possible to increase the water pressure. It is also the reason it is sometimes called a header tank.

An open vented boiler system works by the domestic water tank in the loft being filled with cold water from the mains supply and this water then circulating through the boiler several times where it is heated until it reaches the required temperature and then being stored in the hot water cylinder until you use a shower or a hot tap.

Water in the heating circuit passes through the boiler where it is heated. This water circulates through the radiators heating them up which then transfers the heat energy into the air warming the property.

Whilst most feed and expansion tanks are made from plastic today, it should be noted that in the past they were often made from asbestos and galvanised steel. Typically, these tanks have a capacity of 18 litres.

  • Ideal for properties with low water pressure
  • Designed to produce high volumes of hot water, making them suitable for properties with multiple bathrooms and where hot water is needed from multiple outlets simultaneously
  • Suitable for older homes as no major pipework changes are usually necessary
  • Compatible with solar thermal systems
  • Most conventional systems have an immersion heater located in the cylinder which can back up the hot water in case of a boiler breakdown
  • They are only suitable for properties with space for a hot water storage cylinder and a cold water tank
  • Hot water isn’t instant and can take time to heat up once the water in the hot water cylinder is used up
  • More expensive to install than combi boilers
  • Regular boilers aren’t as efficient as combi boilers or system boilers because they have a constant supply of hot water backed up, so use a lot of energy to ensure that it’s always ready
  • Hot water can run out – if you require a larger amount of hot water, the size of the storage will determine how extensive your supply is. When it empties, you’ll have to wait until the boiler can heat up more water
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