If you find a leak from overflow in eaves after holidays the cause is most likely a the ball valve has got a slight leak that isn’t noticeable when water is being drawn off regularly.
Why would the overflow leak after holidays?
There is always a gap between the resting water level in the water storage tank and the overflow level.
A slight leak on the ball valve gradually raises this water level but every time you run a hot tap it is reset to the resting level.
If the hot water isn’t used much e.g you go away on holiday for a week the water level continues to rise without being reset so eventually overflows.
What can I do about my leaking overflow?
This can be solved by replacing the ball valve. It is possible to buy washer kits to replace the insides of the valves. Personally, I find it’s much more trouble and a far less reliable fix. It’s a bit more expensive but far better to change the valve.
Ball valves are readily available from all DIY stores, plumbers merchants and from online shops like Amazon.
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