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What Boiler Size Boiler Do I Need For My Home? | Boiler Size Guide

What Size Boiler Do I Need?

At Tyne and Wear, we understand that sizing your boiler can be complicated. When working out what size boiler you will need, the first thing to consider is how much heat and hot water you and your family require. This will help you to determine the correct boiler size and minimise the stress of the boiler installation process. It is important to choose your system size correctly so that you can have hot water at your disposal and heat your home efficiently. This will also avoid creating high energy costs. Here at Tyne and Wear, our heating engineers are Gas Safe registered and well experienced in all aspects of boiler installation and repairs.

Boiler size also affects what type of system you will need:

Gas Boilers

Installing a gas boiler can be more complicated. Using natural or propane gasses, gas boilers heat the water in the boiler to boiling point. Once the steam is created, it is then transferred using the pipes in your system to the radiators throughout your home. A gas boiler that is too small for your home will not fulfill your needs or heat your home substantially. It will struggle to keep up with demand and therefore will not provide hot water and heat efficiently. Installing a gas boiler that is too big, will leave you with more than you require and expensive energy bills. When it comes to sizing this kind of system, the process is a little more technical and will involve calculating the square feet in your home.

Gas Boiler Size Calculator

To calculate a gas boiler, you’ll need the size of your house to hand. You were likely informed of this when you bought or began renting your home, however, if you do not have this information, you’ll need to measure your home. To begin, measure each of your rooms by beginning in the corner. Measure the two walls that meet in this spot and then record the dimensions. Complete this step for each room, once you’ve finished you’ll need to convert all of your measurements into square feet. The next step is to calculate the BTUs (British Thermal Units).

Your boiler system will need to produce 50BTU per square foot of your home to heat it efficiently. To get a rough size estimate to multiply the measurement of your home by 50.

Combi Boilers

Combi boilers, short for combination boilers, are one of the most common boilers installed throughout UK homes. This type of system will fulfill both your heating and hot water demands. The size of your combi boiler will be determined by your family size, demand for hot water, and the number of bathrooms in your home. The correct sizing is crucial with this type of system. However, when sized and installed correctly they are practical, versatile systems. Other benefits of the combi boiler include being efficient, easy to maintain, and low cost to run.

Combi Boiler Size Calculator

Before looking at the factors which decide the size boiler you will need, understanding how boiler size is measured first is key. You need the output of the boiler in kilowatts (kW) and not the physical dimensions of the boiler. A kilowatt unit is used to measure how much energy is emitted from a boiler in heat. The more hot water and heat your home requires, the higher the boiler output will need to be. These three factors will determine what size boiler you will need:

  • The number of radiators.
  • The number of bathrooms (with non-electric showers).
  • The number of people in the home (the demand for hot water).

It’s always best to book a consultation with a Gas Safe registered engineer to size and install your boiler. This will ensure you have the correct system for your needs and that it has been installed correctly.

What size do I need for a flat or small house?

For a flat or small house, a combi boiler system would likely be the most suitable option. For a property with 1-3 people and one bathroom with up to 10 radiators, a 24-27kW combi boiler is usually adequate.

What size boiler do I need for a 3-4 bedroom house?

For a larger family with up to four bedrooms, one bathroom, and a maximum of 15 radiators a 28-34kW combi boiler would usually be suitable. However, if your home has more than one bathroom, you may want to consider a system boiler that has a hot water cylinder integrated. This will ensure you constantly have enough hot water stored, to keep up with your family’s demands.

What size boiler do I need for a house with more than 4 bedrooms?

For larger properties, a combi boiler system would not be big enough. You’d need possibly require a boiler up to 42kW and a regular or system boiler would likely be a better option.

It is important to note that these are guidelines and not rules. We always recommend seeking advice from a heating engineer to size your new central heating system.

Other factors can affect boiler size and therefore, it can become complicated. Variables such as heat loss and boiler installation can affect the amount of work your boiler needs to do. To ensure you have the best-sized system for your home, it’s best to contact a reputable engineer. If you require a boiler installation in the Cleadon, Boldon, Whitburn, or surrounding South Shields areas, call Tyne and Wear Heating today for a competitive quote. Our engineers are trained to the highest standards and pride themselves on their wealth of outstanding reviews.

What Boiler Size Boiler Do I Need For My Home