Worcester Greenstar Danesmoor System Utility Oil Boiler 12/18 2022+. Our Greenstar Danesmoor System Utility is part of a market leading range of oil boilers with outputs up to 32kW. Suitable in both kitchens and utility rooms for small, medium and large sized homes, this boiler has been inspired by your feedback and features an easy to remove one-piece primary baffle and cross firing burner.