OSO Delta is the most efficient cylinder on the market, and is the first "A" rated water heating product available across a full range of capacities. Delta achieves an "A" rating through minimisation of standing heat losses by using vacuum insulation panels (in an industry first) combined with 4th generation foam insulation.
Full "A" rating across the range, in accordance with the ErP directive
The most efficient cylinder on the market
Helps housebuilders achieve SAP energy requirements