An estimated 4. An oil-powered central heating system could be a great alternative for heating your home. If you are connected, you'll want to know more about gas central heating boiler types. The reason this question is key is because if you opt for a boiler that's too small, you'll find your home isn't adequately heated, or isn't supplied with enough hot water to meet your demands.
Choose a boiler that's too big and you're likely to produce more energy than you need — increasing your bills and generating unnecessary emissions.
Large families are likely to use lots of hot water, so a conventional or system boiler might be more appropriate. Keep following our questions to find out which is the better option for you. Smaller households are likely to use less heating and hot water and are likely to be better off with a combi boiler. If you have several bathrooms that are often occupied at the same time, then it's likely you have high demand for lots of hot water at the same time. Combi boilers are great for smaller properties - from flats to homes with a single bathroom.
When weighed up against conventional boilers, combi boilers have some small disadvantages. For homes with more than one bathroom, a slight decline in water pressure may be experienced if more than one appliance is using the boiler at any one time. A simple question, but an important one. Some boilers handle demand for lots of hot water better than others. If you have the need for lots of heat and hot water and have a home with a loft or with adequate storage, then a conventional boiler with a storage tank to supply hot water might be for you.
The water is heated via cast iron heat exchangers, meaning you have gallons of hot water at the ready - perfect for homes with storage, and ones with large families needing lots of hot water at the same time. If you have the need for lots of heat and hot water at the same time, but don't have a loft for a storage tank then a system boiler could be a better option.
What is a system boiler, we hear you ask. System boilers work in a similar way to conventional boilers, however, they have major heating and hot water components built into the actual boiler itself which makes it quicker and easier to install. You are using an outdated browser. Please upgrade your browser to improve your experience. Try our power calculator. What size boiler do I need? Find my new boiler. Power input, output and efficiency When calculating your boiler size, you might notice two powers in the specifications of a given boiler.
Our calculator does all the hard work By far the easiest way to work out what size of boiler you need is to use our product selector. Hot water is heated instantly, so you need good mains water pressure.
System boilers store hot water in a cylinder, so multiple hot taps and showers can be drawn simultaneously. OFTEC manages a competent person registration scheme, enabling you to find installers who install, commission and service oil-fired products. This is a term which is also used to describe a Regular boiler type. This type of heating system is typically common in older properties. It provides a rating structure which provides both a percentage efficiency score as well as A to G rating enabling an easy comparison of boilers.
A system filter is a specifically designed unit which aims to remove and filter magnetic and non-magnetic contaminants from your central heating system before they reach your boiler.
Building Regulations always recommends a system filter be fitted to your heating system pipes prior your boiler to prevent any damage to key components. Over time oxygen in the heating system can react with the metals and components of a heating system such as radiators to produce magnetite rust particles, which becomes suspended in your system water.
This process and the build-up of other chemicals such as lime scale can quickly cause blockages and damage key components within the boiler and system. To prevent this a process of thorough system flushing should take place when fitting a new boiler onto an old heating system. This process involves forcing old system water out of the heating system, whilst simultaneously filtering the system until all of the old water and contaminants are removed.
Finally inhibitor and a system filter is added to prevent any future sludge and contaminants from building up. The higher the number selected on the TRV, the hotter the radiator and warmer the room. Please note a TRV should not be fitted on a radiator in the same room as a room thermostat. Weather Compensation is a feature which is programmed into selected boiler controls and Greenstar I Combi boilers.
Designed to improve comfort, the feature automatically adjusts the temperature of your system to compensate for the weather outside.
Each heating system needs custom designing. Find and contact a Worcester Accredited Installer in your area to book a home visit. This makes it ideal for smaller homes or those without attic space. A system boiler takes cold water directly from the mains which means it usually delivers a stronger water pressure than a conventional boiler assuming water pressure is adequate in your area. System boilers can work with a solar thermal system, which uses the sun's energy to heat water for your home.
This can reduce your household's carbon emissions and energy bills. Unlike a combi boiler, a system boiler requires a hot water storage tank, making it far less compact. Any hot water created will be kept in a hot water storage tank until it's needed. During this time heat will be lost, so it's important to try and prevent as much of this heat loss as possible by insulating it.
With a system boiler you can only use as much hot water as your storage tank can hold. If you require more you must then wait for your boiler to heat it again, and this is usually on a set timer.
Visit What is a System Boiler? Thanks to their space saving features, combi boilers are one of the most popular choices in the UK - accounting for over half of domestic boiler installations each year. Combi boilers work by heating water directly from the mains, so you don't need a hot water storage cylinder or cold water tank.
This is ideal for smaller properties without airing cupboard or roof space. This heating method also makes them very energy efficient and affordable to run, as water is not heated and stored and wasted if it's not used.
While combi boilers have some great advantages, there are also considerations you should make before going ahead with an installation. Combi boilers are ideal for small homes as they require no bulky water storage tanks, they also require less pipework. Since you only heat the water you need, when you need it, a combi boiler wastes very little energy and therefore money. Providing you have an adequate level of mains pressure, you should experience a good level of pressure from your shower and taps with a combi boiler.
Since a combi boiler requires no tank, it is one of the more straightforward boiler types to install. This also means it tends to be a cheaper option both for installation and repairs. You don't need to wait for a water tank to heat up as a combi boiler heats water on demand.
This also means you can have an unlimited amount of hot water. It's important to make sure that your mains supply can deliver an adequate flow rate and pressure before choosing a combi boiler.
If not, it may not be the best type of boiler for your household. You cannot use a power shower with a combi boiler, as the pressure is dictated by that of the mains supply. With a combi boiler you cannot run more than one shower or bath at a time or run a hot tap at the same time.
This makes it a less ideal option for larger households with multiple bathrooms. As there is no hot water cylinder with an immersion heater, if your combi boiler breaks down you will not have a backup supply of hot water. Visit What is a Combi Boiler? The most commonly installed type of boiler in the UK is the combi boiler small to medium-sized homes , followed by system boilers in larger homes with multiple bathrooms.
Older properties may need to install a conventional boiler to avoid having to replace pipework and radiators, and homes in areas of low water pressure may find that a conventional boiler delivers better water pressure via its gravity fed system. If in any doubt about the type of boiler you should install, contact a professional heating engineer in your area who can provide you with advice and a quote for the work. Swapping an old, inefficient boiler of any type for a newer model has many benefits including improved efficiency, cheaper heating bills and reduced emissions.
If you are trying to keep installation costs to a minimum, a like-for-like boiler replacement would be the cheapest option in terms of upfront costs.
However, there are several possible reasons why a homeowner might want to change the type of boiler in their home. In most cases, homeowners choose to replace a conventional boiler with either a system or a combi boiler. Now you know that you know the fuel and type of boiler you should be using, the next decision relates to the size of the boiler.
A central heating system needs to be powerful enough for your home's needs. The size or output of a boiler is measured in kW. If the boiler is too big for your home, it is likely to waste fuel and make your heating bills unnecessarily high. If a boiler is too small, it will struggle to heat your home. To work out what size of boiler you need , you should consult a professional heating engineer.
They will consider factors like the number of radiators, the number of inhabitants and the number of bathrooms in your property. The table below gives you a rough guide as to the size range you should be looking for in your boiler search depending on the size of your home and hot water demand.
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