A solar hot water system uses roof-mounted collectors to heat water in a storage tank, usually with an electric or gas booster for cloudy periods and high demand. The best option depends on your household’s hot water use, roof space, climate, orientation and whether a heat-pump system may suit your home better. Upfront costs, running savings and available incentives can vary, and any rebate or certificate eligibility should be checked through the official government guidance and an approved installer. Ask a licensed plumber or accredited installer to assess your roof, plumbing and likely hot water requirements before deciding.