Boiler Leaking Water

Losing water out of a heating system means it's also taking on fresh water, and that quietly eats an old boiler from the inside, so get it looked at.

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When this becomes an emergency

There's a damp patch on the slab that keeps coming back after it's mopped up.
Mineral scale has dried in a white trail down the side of the unit.
The relief valve lets go with a burst of hot water during long burns.
The system needs topping up far more often than it used to.

What a pro does

The important question is how much water the system is losing and where it's going. Some leaks announce themselves on the floor. Others vanish as steam off a hot section and only show up as a feed valve that keeps running and scale building where it shouldn't be. A technician isolates the loop, watches the gauge, and works through the short list of usual offenders: the relief valve, the pump seal, threaded fittings on old black iron, and the tankless coil gasket on units that make domestic hot water. Constant fresh makeup water carries oxygen and minerals into a system that was never designed to see much of either, and on a boiler that has already put in fifty winters, that's the part worth stopping.

Frequently asked questions

How can there be a leak with nothing on the floor?

A slow weep onto a hot section flashes to steam and leaves only a chalky crust behind, so the evidence is the scale and the constant refilling rather than a puddle.

Why does adding water hurt an old system?

Fresh water brings dissolved oxygen and minerals with it, and a system that keeps drinking new water corrodes and scales from the inside much faster than a sealed one.

Is the relief valve worth replacing on its own?

Sometimes, though a valve that keeps opening is usually reacting to pressure it shouldn't be seeing, and swapping it without finding out why leaves the real cause in place.

What can be done before help arrives?

Killing power at the burner switch and closing the makeup water line stops the cycle of leaking and refilling, and it keeps water away from anything electrical down there.

Boiler Leaking Water?

Get connected with a local pro now.

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