Conventional Boiler Installation

Conventional Boiler Installation

At Boilerhut, we offer comprehensive conventional boiler installation 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 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.

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What is a conventional boiler?

A conventional boiler is a type of boiler that requires a boiler unit plus a hot water cylinder and a cold water storage tank.

Conventional boilers are more suited to larger properties due to requiring a hot water cylinder, which is usually housed in an airing cupboard, and a cold water storage tank, which is usually installed in the loft. In open vented boiler systems, there will also be a feed and expansion tank.

One of the oldest boiler types still installed, conventional boilers are sometimes also called heat only boilers.

How does a conventional boiler work?

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.

Advantages and disadvantages of conventional boilers

Conventional boiler advantages

  • 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

Conventional boiler disadvantages

  • 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

Is a conventional boiler right for my home?

This type of boiler is ideally suited for larger homes with a higher number of radiators and multiple bathrooms.

If you have a larger household and live in a property with multiple bathrooms, then a conventional boiler may be suitable. However, there are a number of 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 will be easier and cheaper than swapping a combi boiler for a conventional boiler.

As conventional boilers require a separate cylinder for storing hot water, it is important that you consider whether your home has enough space to accommodate this. However, if you have an airing cupboard or spare cupboard space to hide the cylinder away, a conventional boiler will be suitable for installation at your property. 

You will also need to consider whether you have the loft space to accommodate the water tanks used with a conventional boiler.

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Conventional boiler manufacturers 

Conventional boilers are available in the UK from manufacturers including Viessmann, Ariston, Navien, Worcester Bosch, Vaillant and Baxi.

Conventional boilers available to purchase in 2021 are far more efficient than those that were available to purchase a few years ago. The efficiency of these can be further increased when combined with smart thermostat technology.

System boiler manufacturers

 Gas conventional boilers

Gas conventional boilers are suitable if you live in a property that has high hot water demands and your property is connected to the mains gas supply.

Below are some of the most popular gas conventional boilers currently available in the UK:

Viessmann Vitodens 100-W Gas Conventional Boiler

Worcester Bosch Greenstar i Gas Conventional Boiler

Worcester Bosch Greenstar i System Boiler

Vaillant ecoFIT pure Gas Conventional Boiler

Vaillant ecoFIT pure Boiler

Oil conventional boilers

Like gas conventional boilers, oil conventional boilers are designed to be used in properties with more than one bathroom and high hot water demands. However, oil conventional boilers are specifically developed for properties amongst the four million in the UK which aren’t connected to the mains gas grid.

Below are some of the most popular oil conventional boilers currently available in the UK:

Navien LCB700 Blue Flame Oil Conventional Boiler

Navien LCB700

Worcester Bosch Danesmoor Oil Conventional Boiler

LPG conventional boilers

LPG conventional boilers are another alternative for properties not connected to the mains gas grid. Like oil conventional boilers, the LPG fuel for the boiler is stored in a tank to the exterior of the property.

Below are some of the most popular LPG conventional boilers currently available in the UK:

Worcester Bosch Greenstar i LPG Conventional Boiler

Worcester Bosch Greenstar i

Viessmann Vitodens 100-W LPG Conventional Boiler

Viessmann Vitodens 200-W LPG Conventional Boiler

Viessmann Vitodens 200-W
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