Winter's approaching and so are the sellers of water heating solutions. Water Pure International's products include the Solar Pro, a water heating system with a seven-year warranty. The heaters use vacuum glass tubes for faster heating and well-insulated storage tanks to keep water hot for up to 72 hours. The heaters are available in different sizes-from 77 to 250 litres-and with automatic electric heating for cloudy days. Water Pure, the authorised agents, also sell a range of water filtration systems imported from Singapore.