Is a leaking water heater dangerous? Yes, always 50% In most cases 50% Get Free Quotes Today! Question: Is a leaking water heater dangerous? Top Answer (50% of 2 votes): Yes, always. Get Free Quotes Today! Find Local Pros Free Water Heater Repair Cost Estimates Related Questions Do electric water heaters give off carbon monoxide?Top answer: No My water heater is leaking. What should I do? Who Installs Water Heaters? Do water heater timers save electricity?Top answer: In some cases Does an electric water heater need to be vented?Top answer: No, never