How long does it take to install and underfloor heating system? Date: May 26, 2016 - 11:01 pm Vote Up 0 Vote Down Answered Public Underfloor Heating Central Heating NZ asked May 26, 2016 1 answer Vote Up 0 Vote Down Public Central Heating NZ ⋅ Staff ⋅ May 26, 2016 On a 100 square meter home: One day pre-line, one day manifold and heat source installation then 8 hours spread over 5 weeks for the commissioning process. #1 Please login or Register to Submit Answer