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How to Select the Size of a Natural Gas Boiler for 1,245 Square Feet

Choosing the wrong boiler for your home is a potentially risky proposition. A boiler gives you hot water when you need it and provides hot water for cooking and bathing. When you use a boiler that is too small, though, the boiler will run essentially constantly, which reduces its efficiency. A too-small boiler leads to higher energy costs and leaves you without proper hot water. Choosing a boiler that is too large also leads to high energy bills. The right size of boiler for your home depends on the home's square footage and other factors. Choosing a boiler for a home of 1,245 square feet involves looking at the current system and determining your needs.

Instructions

    • 1

      Locate each radiator in your home. Find the heat output recommended by the manufacturer on each radiator. The heat output should sit on a small tag on the back or side of the radiator. If you have the manual for your radiators handy, find the information listed inside. Add the amounts together, which gives you the total heat output of the radiators.

    • 2

      Find the hot water cylinder from your home. The hot water cylinder is part of your existing boiler system. In some cases, your home might not use a hot water cylinder. Consult the manual for the boiler for more information. If you do have a hot water cylinder, add a total of 3kW to the figure from Step 1.

    • 3

      Multiply the figure from Step 2 by 10 percent and add that amount to your total. The total equals the boiler size needed for your home. If you live in an area with moderate temperatures, skip Step 3. This step is best suited for areas with colder winter temperatures.

    • 4

      Compare the finished figure with the size of your existing boiler. If the number is higher, it indicates you currently have a boiler that is too small; if the number is lower, it indicates that your boiler is too large for the home.

    • 5

      Choose a size based on your current needs. If the size required is smaller than that of your current boiler but your current boiler does not provide adequate hot water, increase the size. The number of people in your home might require more hot water than the boiler can provide.

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