If, however, you have a large or growing family, or your home has more than one bathroom, a combi boiler may struggle to provide sufficient hot water. This is because the water is heated as it is used, rather than stored in a tank. If you are likely to be using more hot water, you will certainly want to consider whether a conventional or system boiler that includes a hot water tank is the right choice.
A combi boiler is sized to provide hot water on demand and you will see its capability expressed in terms of how much water it can heat per minute to a defined temperature rise, e.
The higher the flow rate you require, for filling baths more quickly or to have a more powerful shower, for example, the larger your boiler should be. This means that combis are typically oversized in order to meet heating demands, making them less efficient than other types of boilers, such as system and conventional boilers, when heating the home.
System boilers and conventional boilers preheat hot water to be stored in a water cylinder and therefore, hot water flow rate is not as critical. The heat load for an average home can vary from around 10 kW to 20 kW, which means that system boilers and conventional boilers can be sized smaller than combi boilers. They will therefore be more efficient when heating the home, but they require more space. A key factor that will have an effect on the size of boiler you need is the number of radiators.
If you have just a few, for example in a small flat, then choosing the smallest suitable boiler will offer you the greatest level of economy and ensure you avoid paying more than you need to for energy. The average three or four-bedroom house usually has about ten radiators. For this reason, it would require a kW combi boiler. A larger house that has more radiators and more bathrooms would need a larger kW boiler. If you have a large house with as many as twenty radiators, a large kW combi boiler may be needed to provide sufficient heat with the best economy, or you would be better to change to a system boiler, which could be sized more appropriately.
In the past, the physical size of your house was often used as a factor in considering the right size of boiler. Heat loss calculations take into account a range of factors including floor area, number of radiators, number and type of windows, insulation and other aspects that will cause heat to be lost from your home.
A heating expert will then use this information to work out how much heat your house will lose on the coldest day of the year, allowing them to advise you on the optimum boiler size. Best gas boilers for properties with radiators Combination boilers What is it? What else do I need to consider when replacing a boiler? Property type The layout of your property informs the size and type of boiler required to heat your home.
Insulation The level of insulation in your home will also determine the size of boiler required to keep the home warm for longer. Number of radiators The number of radiators installed in your home will determine which boiler is best to provide enough hot water to heat your entire home.
Number of bedrooms The number of bedrooms indicates the size of the home that needs to be heated. Number of bathrooms More than one bathroom in your home? Mains water pressure The water pressure will determine whether your boiler can produce enough water pressure on its own.
Current boiler Your current boiler determines the layout of your central heating system. Boiler brand In the boiler market, there are several different brands with varying levels of energy efficiency and build-quality. The type of boiler you would like You might have a boiler you would like in mind, or you might have been recommended a particular boiler.
What are the boiler types? Best gas boiler for 2 - 3 bathroom houses If your home has 2 or more bathrooms, a combi boiler may not be able to cope with the high hot water demand. Boiler efficiency tips Insulation To prevent the loss of heat through your room, walls, floors or windows, having proper insulation installed is essential.
What radiator size? Annual boiler servicing Boiler servicing will ensure that your boiler keeps running at its best for as long as possible.
You may also like. What is boiler cover? What is a boiler service? Use our online quote tool to know the boiler size that your home needs. To work out what size boiler you need for your home, use our boiler calculator here: Boiler Calculator. Opting for the larger size boiler for your house than needed will cost more money than is necessary.
By not using the boiler calculator and guessing what size boiler you need and going larger will mean you have spent considerably more money on a boiler model that you do not need. If the boiler you choose is not upscale, you may be wasting a lot of money on burning unnecessary gas. Please Note: If you are planning an extension of your home that would include additional showers, It may be worth considering a boiler with higher power kW and a larger hot water tank.
The size of the combi boiler for your home depends on the amount of bathrooms. Check the table below. The boiler sizing calculator suggests if you have more than 1 bathroom in your home, you need a boiler with more power to handle the higher hot water demand, especially when people tend to shower at the same time.
What size combi boiler do i need? The more bathrooms you need heated, the larger the boiler you will need. Viessmann has managed to lead us into the future and to build a hybrid boiler — the Viessmann W. It is a combi boiler that stores the water within the unit enabling it to suit homes with up to 5 bathrooms.
Regular boilers are also called heat only boilers, featuring a boiler, hot water tank and a cold water tank. The hot water tank is usually found in an airing cupboard and the cold water tank resides in the loft in most cases. The number of radiators are the main factor with regular boilers as well as the number of bathrooms that you have.
Both of these give us an idea of the heat only boiler size that you will require. If you are asking yourself what size boiler do you need for a certain amount of radiators, see the table below which gives you an idea of regular boilers for different radiator configurations.
Contrastingly to regular boilers, system boilers use a pressurised heating circuit, topped up by mains water. They also occupy less space because the expansion vessel is internal in a system boiler, whereas it is external in a regular boiler. Once you have chosen the type of boiler you want, the next step is to select the correct size according to the heating requirements of your home.
Alongside boiler type, the factors that affect boiler size include:. Combi boilers typically have a larger power output than system and heat-only boilers because they have to heat water on demand. The most suitable boiler size can be worked out according to the following categories, and once you have taken a look you can browse our range of combi boilers to find a suitable solution. System and regular boilers store hot water ahead of time, meaning they are built with a smaller power output than combi boilers.
The table below showcases the best boiler sizes depending on the heating requirements of a home. If you're interested in having one of these types of boilers installed in your home, you can browse our range of system and heat only boilers to find the perfect solution for your heating and hot water demands.
Please be aware that these are just general guidelines into what size boiler would fit within certain properties. We always recommend consulting with a professional heating engineer before making your decision. Why not get in touch with a Vaillant Advance installer? They will be able to give you a free no-obligation quote after expertly surveying your home.
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