Why is my header tank overflow dripping?

When an overflow pipe is dripping or running with water, one of the most common causes is a problem with a float valve. Float valves are found in toilet cisterns, cold water tanks and central heating feed and expansion tanks. When the water in the tank is used, its level goes down and so does the ball and arm.

Why is my expansion tank dripping?

But sometimes, due to wear and tear, your expansion tank may start leaking. If the leak comes from the pipe fiting (seen at the top of the tank), try using a wrench to tighten the fitting. If the leak comes from the tank itself, though, you’ll need a professional to repair or replace the expansion tank.

Why is there sludge in my central heating header tank?

REASON: When your system expands, it pumps the expanded water into the header tank. This water will be hot and contain the sludge in the system. You may also consider turning down the pump setting from 111 to 11.

What is the small pipe on the side of house dripping water?

2) Drain pipe for catch pan under water heater – The drain pan under the water heater is required to have a drain pipe to the exterior, to avoid flooding the home if the water heater starts leaking.

Why does my hot water heater overflow keep discharging water?

Causes of Excess Pressure in a Water Heater Since water expands as it’s heated, higher-temperature water occupies more volume, which, in the confines of a water heater, results in increased pressure. If the pressure increases too much, your relief valve will activate, releasing water through the drain pipe.

How do I stop my expansion tank from leaking?

Circulatory Leak. Remove the intake pipe from the main heating tank to the circulatory and remove the circulatory pump completely from the heating unit. Replace the gasket and re-install the circulatory pump by first wrapping the threads with Teflon tape and using two pipe wrenches to tighten the pump.

What colour should water be in central heating system?

There are some signs to look out for to assess if it’s time to flush the system, starting with the colour of the water when you bleed the radiators. If it’s clear, you’re OK. If it’s slightly brown, then you’ve got sludge in the system and you therefore need to get it flushed.

Does a water tank need an overflow?

Plumbing the overflow away from the tank is important to prevent erosion around the base of the tank. Most poly water tanks come with a 90mm overflow fitting so you can plumb off with standard 90mm stormwater pipe.

How do you unclog a main condensate line?


  1. Turn off the power to your HVAC unit.
  2. Find your AC drain line.
  3. Push the stiff, thin brush into the end of the drain line.
  4. Attach the end of your wet/dry vacuum to the end of the AC drain line.
  5. After you’ve run the vacuum for about a minute, remove the wet/dry vac and head indoors.
  6. Locate the vent tee.

Why is my central heathing header tank dripping?

Even when dripping the water is nowhere near the overflow pipe (4+ inches below) – the inside tank is dripping with condensation though. The water is cold, not icy cold but cold enough. The overflow pipe only feeds the header tank, there is a separate overflow for the cold water tank.

What can cause the header tank to overflow?

Being at the very top of the heating system puts the header tank at risk of a number of problems: What can cause header tank overflow? There are many reasons why the header tank is overflowing: Pump over run is when the boiler continues to pump for a few minutes after the central heating or domestic hot water is turned off.

Where is the cold water in a header tank?

Usually the header tank that is filled with cold water from the mains is located about the hot water cylinder. I’m assuming this is what you are referring to. A slow drip can take ages to raise the level in a header tank noticeably & and that’s if no water is being used for several days.

Where does the overflow from the central heating tank go?

The central heating feed and expansion tank overflow pipe runs from the small water tank in your loft to the outside of your house. It will be made of either plastic, copper or lead and usually leads out through the eaves and soffits. The tank supplies your heating system and allows water to expand safely within the system when it’s heated.

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