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Upgrade to Adlår Castra's award-winning Dual Air Source Heat Pump System, the UK’s most efficient, fully funded system. With installs starting from £6,999 and £7,500 available via the Boiler Upgrade Scheme, you could be eligible for £500 cash back just for making the switch! *£7,500 grant available via the Boiler Upgrade Scheme. Eligibility criteria and T&Cs apply for both the BUS and Adlår upgrades.