No, it is essential to only connect cold water to this pressure washer. Hot water can cause the pump to overheat and potentially damage it. It is important to note that hot water pressure washers are specifically designed with separate boilers to heat water using kerosene or diesel. However, the pressure washer you have is a residential-style cold water pressure washer, not intended for commercial use or heating water. Therefore, to ensure the proper functioning and longevity of your pressure washer, please only connect it to a cold water supply.