EFD3 Pressurisation Unit - NEW IN BOX The MIKROFILL 3 is the most advanced ‘directtype’ pressurisation unit available, suitable for sealed system LPHW / CHW applications of any size. Unlike ‘pump type’ pressurisation units the MIKROFILL 3 is designed to be connected directly to a buildings incoming mains/boosted water supply and fill a heating or chilled water system without the use of a pump. The MIKROFILL 3 is the most energy efficient unit of its kind consuming as little as 10 watts/hr on standby and 30 watts/hr fully operational.