The water heater is equipped with safety device called a pressure relief valve. This valve is designed to open automatically when water pressure inside the tank becomes too great.
The relief valve should have a lever on the top. Lift it / push down on it briefly and it will allow water in the tank to flow through it (and out the pipe into the bucket). By allowing water to flow, will clear any debris caught between the seat and seal that may be causing the leak. If the valve continues to leak after doing this, the valve should be replaced. In most areas, this type of work is required to be performed by a licensed / qualified plumber.
Good luck!
SOURCE: my relief valve slowly drips
Is the pressure in the boiler higher than the set pressure of the relief valve? If it is, there is a problem that the relief valve is trying to correct.
If not, did you try making the valve open?
Be careful, but step back, lift the lever and briefly let the relief valve discharge into a bucket of some sort, maybe you could put some old rags in it to keep from spraying out at you. If there is sediment in the valve this may flush it out.
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