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In most plumbing setups, it takes a while for hot water to reach the hot tap when it's turned on. Cold water diverters recycle the cold water which would otherwise pour down the drain in this time.
There are some fairly well-defined rules when it comes to how kitchen benchtops should be installed. Read more about what these are.
There are regulations that dictate where you can place a chimney, both in relation to your own roof and the roofs of neighbouring properties. Find out how this applies to your home.