LPG Central Heating and Boilers Explained

Welcome to the comprehensive guide on LPG central heating and boilers, where we unravel the inner workings of this efficient heating system for your home..

LPG heaters work on the both the principle of direct combustion and convection. The fuel (LPG) is burnt and the heat generated is sent to the water circulating in pipes. The heat from the water is now transferred through the house by underfloor heating or radiators.

Curious to learn more about the inner workings, benefits, and safety aspects of LPG central heating and boilers? Read on to find out more!

What is LPG?

Liquefied Petroleum Gas (LPG) is a flammable hydrocarbon gas that is commonly used as a fuel source for heating and cooking. It is a byproduct of natural gas processing and petroleum refining. LPG is stored under pressure in cylinders or tanks and is transported as a liquid. It is a clean-burning fuel that produces lower emissions compared to other fossil fuels, making it an environmentally friendly option.

How does LPG Central Heating work?

LPG central heating systems work by utilizing a boiler that is specifically designed to burn LPG as fuel. The boiler is connected to a series of radiators or underfloor heating systems throughout the house, providing heat to each room. The process begins with the LPG being stored in a tank or cylinders located either above or below the ground near the property.

When the heating system is turned on, the LPG is delivered to the boiler through a pipework system. Inside the boiler, the LPG is ignited, producing heat. The heat generated by the combustion process is transferred to the water inside the boiler’s heat exchanger. 

The heat exchanger is a series of metal pipes or plates that allow the heat to be transferred from the burning LPG to the water without the two substances mixing. This heat is then transferred to water, which is circulated through the radiators or underfloor heating pipes using a pump. As the water passes through the radiators or pipes, it releases heat, warming up the rooms. After the water circulates the room, its temperature cools down and the water is sent to to the boiler to be reheated.

The boiler also has controls and thermostats that allow homeowners to set the desired temperature and adjust the heating according to their needs. Additionally, LPG boilers can be combined with other heating technologies, such as solar thermal systems, to further enhance energy efficiency.

Advantages of LPG Central Heating and Boilers

  • Versatility: LPG can be used in a variety of heating systems, including conventional boilers, combination boilers, and even renewable technologies like heat pumps. This versatility makes LPG central heating a suitable option for both new installations and retrofitting existing systems.
  • Clean and efficient: LPG is a clean-burning fuel that produces lower emissions compared to other fossil fuels, such as coal or oil. This makes LPG central heating a more environmentally friendly choice. LPG boilers are also highly efficient, with modern condensing boilers achieving efficiency ratings of over 90%.
  • Energy security: LPG is readily available and can be stored on-site, ensuring a continuous supply of fuel even in remote areas where natural gas connections may be unavailable. Homeowners have control over their fuel supply, eliminating dependency on external infrastructure.
  • Cost-effective: LPG central heating systems can be cost-effective compared to alternative heating options. The price of LPG is usually competitive, and with efficient boilers, homeowners can reduce their energy bills while enjoying a warm and comfortable home.

Installation Considerations for LPG Boilers

Before installing LPG boilers, you must consider the following factors before installing them.

  • Professional Installation: It is essential to engage a qualified heating engineer or installer to ensure the proper installation of an LPG central heating system. They will have the expertise to assess the property’s heating requirements, recommend suitable equipment, and install the system in compliance with safety regulations.
  • Storage Options: LPG central heating systems require adequate space for the storage of LPG tanks or cylinders. The choice of storage option depends on factors such as available space, heating demands, and aesthetic preferences. Common options include above-ground and underground tanks, as well as cylinders.
  • Fuel Supply: Homeowners must establish a reliable LPG supply arrangement. This can be achieved through agreements with LPG suppliers who will regularly deliver the required amount of fuel to ensure continuous operation of the central heating system.

What Type of Boilers work with LPG Systems?

There are basically three basic types of boilers, with each of them having their downsides when paired with LPG systems. They include the following:

  • System Boilers: System boilers require a lot of area because they also include a hot water cylinder in the building. These boilers work well with an LPG system and can be converted very quickly. System boiler storage tanks are frequently housed in an attic space or an airing cupboard.
  • Combination Boilers: Combination boilers, also referred to as Combi Boilers, lack a hot water storage tank. In contrast, heating and hot water are delivered as needed. It’s important to note that you cannot use the shower and your radiators at the same time because the hot water takes precedence until the demand decreases, at which point the heating will resume operation. While standard and system boilers are suitable for larger properties, combi boilers are better for smaller properties. Using LPG in this sort of boiler can be less effective for you.
  • Standard Boilers: In the UK, standard boilers are the most prevalent type of boilers. They take up a lot of room in the house, just like system boilers, because they have a hot water cylinder and a cold water tank, which are typically found in the loft. But given that the equipment is already easily available, they nevertheless manufacture the most efficient LPG boilers despite their size.

Cost of LPG Boilers

The purchase price of an LPG boiler can vary depending on several factors, including the brand, model, and capacity. Generally, LPG boilers tend to be slightly more expensive than natural gas boilers due to the additional components required for the LPG system, such as storage tanks or cylinders. However, it’s important to consider the long-term benefits and potential savings associated with LPG boilers when evaluating the initial purchase cost.

Installation Costs

In addition to the purchase price of the boiler, installation costs are an important consideration. The installation costs of an LPG boiler will depend on factors such as the complexity of the installation, the location of the boiler, and any additional work required, such as installing a new gas supply line or upgrading the existing heating system. It is recommended to hire a qualified heating engineer or installer who has experience working with LPG systems to ensure a safe and efficient installation.

Running Expenses

Running expenses include the ongoing costs associated with operating an LPG boiler. These costs primarily involve the price of LPG fuel. LPG prices can vary depending on factors such as market conditions, supplier, and location. It’s advisable to compare fuel prices from different suppliers to ensure you are getting the best value for money. Additionally, LPG boilers tend to be more fuel-efficient than older, non-condensing boilers, resulting in potential savings on energy consumption and running expenses.

Savings and Efficiency

Although LPG boilers may have higher running expenses compared to natural gas boilers, they often provide savings in other areas. LPG boilers are known for their energy efficiency, especially condensing models, which can achieve efficiency ratings of over 90%. The increased efficiency means that less fuel is needed to generate the same amount of heat, resulting in potential savings on energy bills.

Furthermore, LPG boilers offer flexibility for properties that are not connected to the natural gas grid. They can provide a reliable heating solution in rural areas or locations where access to other fuel sources may be limited. The convenience of having on-site LPG storage also offers peace of mind and independence from potential disruptions in the fuel supply.

Maintenance and Servicing Costs

Regular maintenance and servicing are essential for ensuring the optimal performance and longevity of an LPG boiler. It is recommended to schedule annual servicing with a qualified heating engineer or installer.

The cost of maintenance and servicing can vary depending on the complexity of the system and any potential repairs or replacements required. However, investing in regular maintenance can help prevent costly breakdowns, ensure safety, and maintain the efficiency of the boiler.

Here are some maintenance practices to consider:

  • Regular Inspections: Conduct regular visual inspections of the storage tanks or cylinders for signs of wear, damage, or corrosion. Address any issues promptly.
  • Pressure Testing: Schedule periodic pressure testing of LPG storage tanks to ensure their integrity and safety. This should be done by qualified professionals according to the relevant regulations.
  • Valve and Fittings Check: Inspect the valves, fittings, and connections regularly for any leaks or damage.

Safety Measures for LPG Boilers

To ensure the safe storage of LPG, it is essential to implement the following safety measures:

  • Protective Barriers: Install suitable protective barriers, such as fences or bollards, around the storage area to prevent accidental damage or unauthorized access.
  • Fire Safety Precautions: Keep the storage area clear of flammable materials and maintain proper fire safety measures, including the availability of fire extinguishers and suitable signage indicating the presence of LPG. 
  • LPG storage should be positioned at a safe distance from buildings, structures, or other flammable materials. Maintain a minimum distance of 3 meters from buildings and at least 10 meters from ignition sources, such as open flames, electrical equipment, or heat sources.
  • Gas Leak Detection: Install a gas leak detection system, such as LPG gas detectors, in and around the storage area. These detectors can provide early warnings in the event of a gas leak, allowing for prompt action to be taken.
  • Regular Inspection and Maintenance: Regularly inspect the storage tanks or cylinders for any signs of damage, corrosion, or leaks. Arrange for professional maintenance and inspections as per the manufacturer’s recommendations or local regulations.
  • Security Measures: Implement appropriate security measures to prevent unauthorized access to the LPG storage area. This may include locks, access control systems, or security cameras.


LPG heating systems are wonderful alternative for homes without access to gas networks. They are much cheaper and cleaner alternative to oil heating systems. LPG boilers have an efficiency of over 90% making them a more efficient system for heating homes. While they are relatively cheap, the average cost of a unit depends on the size, brand, or heating capacity.