If there is a blockage, will it back up & burst? Comments Off on If there is a blockage, will it back up & burst? 21 Jan 2016 Vote Up 0 Vote Down Answered Public Public Private Underfloor Heating Anonymous asked January 21, 2016 If there is a blockage, will it back up & burst? 1 answer Vote Up 0 Vote Down Public ⋅ January 21, 2016 No, there are safety valves in place so this does not happen. #1 Please login or Register to Submit Answer