The guide mentioned in the last two paragraphs is mainly about how to ______. 材料
The cost of heating your home, particularly during the colder winter months,makes up about 60% of energy bills.If you need a new boiler(锅炉),makes sure you buy one of the best boiler brands.
The first question you should ask yourself if you want the most energy efficient boiler is what type of boiler you should buy.All modern boilers that you can buy are condensing(冷凝式)boilers,which are much more efficient than traditional non-condensing boilers. According to a study, you could save as much as ?340 a year on your gas bill if you're trading in an old-style non-condensing boiler for a new condensing one.
Getting the wrong type of boiler for your home results in unnecessarily high bills.Learn more about the different types of boiler and which would suit you best in our full guide to the different types of boiler.
Once you've decided on the type of boiler you need, the next key question is the size.The size of the boiler in the context of efficiency is its heat output. The higher the heat output of the boiler,the more energy it will be using when it's switched on. In most cases, larger homes with moreradiators(散 热 器)and more bathrooms will need a larger heat output than smaller ones. Learn
everything you need to know about picking the right size boiler for your home in our free (guide) on how to buy the best boiler.
单选题

The guide mentioned in the last two paragraphs is mainly about how to ______.

A. test a new boiler
B. buy a used boiler
C. select a best boiler
D. repair a leaking boiler

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