If your water heater is leaking, it's advisable to avoid taking a shower until the issue is addressed. A leaking heater can present potential electrical hazards, especially if water comes into contact with electrical components. Additionally, for gas-powered heaters, a water leak might hint at a more serious underlying problem that could also involve a gas leak. Until a professional has inspected and rectified the issue, it's best to prioritize safety and refrain from using the heater for showers or any other purpose.