small header tank overflor

Postby s70rds » Sun Jan 31, 2010 1:12 pm

can anyone advise why my small water tank in the loft keeps going to overflow - checked ball valve operation and it closed about 4 inches below the overflow.

What else can cause that ?
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Simply Build It

Postby stoneyboy » Sun Jan 31, 2010 10:06 pm

If you have a mixer tap in the kitchen the casting may have perforated allowing mains water to feed into the hot water system OR the coil in your hot water cylinder has perforated. Turn off the mains water and see if the tank still overflows, if yes its most likely to be the cylinder.
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Postby Dave From Leeds » Mon Feb 01, 2010 5:39 pm

When you say the small water tank in the loft, do you mean the smaller of two cold water tanks with ball valves? If so, another possible cause might be "overpumping" from your central heating system If your pump has variable speeds, try turning it down.
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