These data are derived from registrations under the Microgeneration Certification Scheme, and as such likely underestimate the total number of installations due to lower coverage of new build homes. Year Technology 2016 2017 2018 2019 2020 Air Source Heat Pump 1,305 1,269 1,737 2,243 2,477 Biomass 388 187 102 74 69 Ground/Water Source H...