How high should my header tank be?

there should be a mimimum height between top of circulation pipework & header tank water level of 450mm (18″) but the more the better the system will work.

How much water should be in central heating expansion tank?

This is so that the water in the central heating system has the space to expand when heated. The cistern must be able to accommodate the expansion of the water by approximately 4% of its original volume. The elevated water level must be at least 25 mm / 1 inch below the overflow.

Why must the top bend of the vent pipe be 40cm above the water level of the F&E tank?

The top of the bend should be at least 40 cm (15.75 inches) higher than the surface of the water in the cistern. This helps to ensure that water isn’t inadvertently pumped into the cistern when the boiler is on. This problem is known as pumping over, and will enrich the water in the cistern with oxygen.

Why is my feed and expansion tank overflowing?

Faulty coil in the hot water cylinder As the hot water passes through the coil at the top, its heat is transferred to the domestic hot water, warming it further, before it exits at the bottom of the coil – known as the flow and return. This rise in water levels can then lead to the feed and expansion tank overflowing.

How much water should be in a header tank?

This is a feed and expansion tank (header tank) used for topping up water in central heating systems.

Should header tank be covered?

Should i purchase a cover? Yes, it prevents moisture escaping to the loft space – over a long period can cause problems with rotten timbers in loft/roof space. It also prevents dust sitting on the water – which will eventually end up in the heating system.

Should the water in the expansion tank be hot?

Expansion Tank Maintenance The top portion of the tank should feel warm to the touch, and the bottom portion of the tank should be room temperature. If the entire tank is warm, it is likely that the tank has completely filled with hot water, which occurs only if the diaphragm fails.

What is the minimum distance the vent pipe should rise off the top of the cylinder?

IIRC, it should rise to 450mm above the water level before coming down “into” the tank (just above the water line, entry via top of the tank/lid).

Why is my F&E tank overflowing?

Some of the causes to the problem that you describe could be a faulty ball valve, the water level being set too high not allowing for expansion, the pump speed being set too high, A blocked cold feed, the open vent cold feed being in the wrong place, the over flow being connected too low in the tank, vent pipe not high …

How does an F and E tank work?

When water is heated it expands. An F&E tank will take up the increased volume of water in the system from expansion. As the system cools, the F&E tank ‘feeds’ water back into the system. The ‘open vent’ is a pipe which rises from the heating system to above the tank and hooks over into it.

How do you size a cold water storage tank?

A new cold water tank should have a minimum capacity of at least: 100 litres (22 gal) if it is to supply only either a cold water system or a hot water system. 200 litres (44 gal), (ideally 250 litres (55 gal)) if it is to serve both the cold and hot water systems.