Can I shut off underfloor heating in winter?

Hi Melanie, With any property that you close down when not in use, there is always the risk to pipework and water supplies freezing or leaking or both! Correctly covering any exposed pipework will help to reduce this risk. If you have electrical underfloor heating then it shouldn't be a problem to turn it off but water based systems (and this is the same for central heating & hot and cold water) will always have a 'possible' risk of failing, especially during super cold snaps we had recently. Best solution is to have a time system that only bring the systems online to run warmer water through to eliminate this as much as possible. Hope that helps a little but happy to help further if needed.

As long as the boiler is left on and the temperature is set not any lower than 5degrees ( although there are a lot of boilers with built in frost stats , check by ringing the manufacturer). Each room will have a thermostat, set these to 5 degrees. So if there is a cold snap the boiler will come on and any rooms that are colder than 5 degrees they will come on, otherwise the boiler will sit there dormant.

There is minimal chance that the pipes could freeze because they are plastic fitted in insulated designed confiquration for your zones that only has connections at the manifold, unless the installers have just layed them on top of concrete with a screed layer above. If the UFH is electric there is no problem, however it is better to leave "ON" at a low temperature to reduce mould occuring, they are set at a lower temperature at the manifold.