From next month, household energy bills are set to climb once more, reigniting a debate that has quietly shaped the UK property market for the past three years: how to decouple homes from volatile gas prices. Against that backdrop, a niche but rapidly maturing technology is emerging from the fringes of the smart-home sector — domestic "datacentres" that heat water and living spaces as a byproduct of computing power, rather than burning fossil fuels. Giles Gibson's London home, where a compact server strapped to his hot water cylinder does double duty as a heat source, is an early but instructive example of a trend that landlords, developers and asset managers should be watching closely.