4 Answers

Well, if you do that, then you will want to open your taps so standing water in the lines does not freeze. You will have to bleed the lines of air when you turn the water on again though. 

You may want to protect the fixture traps from freezing by pouring in  approved anti freeze  and also make sure that all trap seals are replenished before leaving to prevent carcinogenic  and flammable sewer gases from entering your home

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In most homes, you can turn off the main water supply while on vacation, even if you have a heat pump for heating and cooling. Your air-source heat pump generally does not rely on your domestic water supply to heat or cool your home, unless it is part of a specialized water-based system. If you have a separate water heater, turning off the main supply may affect it, so check the manufacturer’s instructions before changing its settings. Keep your heat pump operating at a suitable temperature to protect your home from excessive heat, humidity, or freezing conditions. Shutting off the water can help prevent costly damage from leaks while you are away.