A combination boiler, or a combi boiler, is a small unit that heats water as you're using it. This means that there is no hot water tank or storage cylinder, which eliminates space and storage issues. It also makes it a great deal easier to turn off the supplies of hot and cold water, since there's less equipment to deal with a fewer pipes for you to follow if you have a combination boiler.
Locate your combination boiler. It should be located on one of the walls in your house, likely in the basement. It will be the device where your water pipes for hot water all lead to, and if you have a finished basement it may be set aside in a utility closet so that it doesn't mar the appearance of the rest of the basement.
Locate the feed that comes into the boiler from the main water line. Follow this line back to the main line where it comes into your home. Look for a valve before the main line feeds into the boiler, which should be near where the line comes into your home.
Turn off the main line valve. The valve should be a hand-crank variety like a garden spigot, and once you've turned it clockwise until it stops there will no longer be water feeding into your home. If you turn on the faucets you will be pushing the remaining water out of the system and leave your pipes empty.
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