Being an air to h2o monobloc heat pump, it operates proficiently employing eco-helpful R290 refrigerant, offering sustainable heating with a powerful A+++ energy efficiency ranking. The ECOMOD 290HT range of monobloc air source heat pumps are available in 3 chassis sizes and five outputs: 15kW, 18kW, 27kW, 40kW and 50kW. https://purethermal.co.uk/media-news/q4-launch-lithium-large-capacity-r290-ashp-from-pure-thermal-and-enerblue/