The use of space resources will play a vital role in sustaining a permanent human presence on the lunar surface. In Situ Resource Utilisation (ISRU) allows the extension of current and future missions. A vitally required resource at the lunar surface is rocket propellant allowing the movement of humans back to cislunar space and more complex missions into deep space. Water ice stored at the lunar poles in Permanently Shadowed Regions (PSRs) could be used as rocket propellant. The water ice in PSRs is stored at < 110 K and measured in situ at 5.6 ± 2.9 wt. %. The ice is present in such quantities that it could allow a valuable cislunar economy to be established. The exact nature of water ice stored at PSRs is currently unknown; however, finding a technique that maximises the water ice extraction as quickly as possible will be crucial given the harsh conditions present in a PSR (no solar energy, < 110 K, vacuum conditions). Microwave heating could offer quick water ice extraction without regolith excavation. Microwave heating offers deep volumetric heating meaning substantially higher heating rates than other possible techniques. High-power microwave heating has already been proven as a useful ISRU technique in additive. This work concentrates on using low-power (250 W) microwave heating to extract water ice from icy lunar simulants.