by 
The Curious Bag
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<h4 class="dechead">On One Hand: Size of Heating Area
Understanding the size of the area you wish to heat with a gas boiler will play a factor in determining the size of boiler you should purchase. If you know the square footage, multiple it by 50 to determine the Btu (British thermal unit) your boiler should meet in order to heat the area.
On the Other: Efficiency of Appliance
If you live in a mild climate area, a lower-energy or Energy Star boiler might be your best option. Understanding the efficiency of the unit, as well as the efficiency of the structure, are also important when gauging the size of a boiler unit. Talk to a contractor to understand the efficiency of the unit (including controls to reduce cost) and the efficiency of the structure (such as the pipes and weather stripping).
Bottom Line
Having a complete picture of the area to be heated can help you determine what size boiler you should use. You should also consider environmental factors for the area, such as climate type. Contractors should be able to help you weigh the options when looking at boilers.
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