The high temperature Daikin Altherma Flex system is highly energy efficient and easy to operate. Daikin Altherma Flex is at least 50% more efficient than a fossil fuel boiler.* The air-to-water heat pump system consumes less primary energy as it absorbs heat (free renewable energy) from the ambient outside air. *Fossil fuel boilers lose efficiency year on year, even if maintained and operated correctly. Daikin Altherma air source heat pump’s maintain their efficiency throughout their lifespan, if ...