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Gas Appliance Guide

www.gasapplianceguide.co.uk

Metal Header Tanks (F&E Tanks)

Copper and Stainless Steel Header tanks


High temperature F&E header tanks

 

What is a header tank?

In a fully open vented heating and hot water system you will often find water storage tanks in the loft. It is quite common to find two. The function of each is however quite different.

You may well find that one tank (usually the larger of the two) is a Header Tank, whereas the other (the smaller) is a Feed and Expansion Tank (also known as an F&E tank).

A Header Tank is a cold water storage vessel usually filled via a ball cock (or float valve) directly from the incoming cold water main. This tank stores the water that feeds to your hot water cylinder. The high position of the Header Tank creates 'a head' of water which determines the pressure of the hot water system in the property. System pressure can be calculated roughly by applying the following equation: Measure the vertical difference from the Header Tank to the point of outlet. A 10 metre differential will give 1 bar of pressure at the outlet. Pressure can be raised (albeit only slightly) by raising the Header Tank within the loft space.

What is an F&E tank?

A Feed & Expansion tank is typically connected to the 'heating' side (boiler or radiator circuit) of an open vented system and as its name suggests provides a method of replacing (feeding) water that can evaporate as the system gets hot whilst facilitating the associated expansion of the water contained within the system.

What should an F&E or Header Tank be made from?

Header tanks can be made from a range of materials, but metal header tanks (typically made from copper or stainless steel) are arguably better suited for use on systems where the water can become very hot - such as in solid fuel installation (wood burner, AGA, back boiler), with thermal stores or where the heat source is uncontrollable by nature.

   
Copper header and F&E tanks

What are the advantages of a copper header tank?

A copper or stainless steel header tank is not susceptible to melting or warping in systems where the water temperature is high. This can be a particular problem on a system which incorporates a solid fuel boiler or uncontrolled heat source, as they are capable of heating the water to in excess of 100C.

Metal feed and expansion tanks have the following features as standard, which saves installation time and provides overheating protection all round. All header tanks are supplied with a float valve and copper float which is also tolerant of higher temperatures.

Insulation available if required

Whether or not this type of F&E tank should be insulated is a matter for conjecture. Given that the expanding water might be very hot (the reason why your tank is metal) is there any point in holding the heat in? For this reason you have the choice. For a small additional cost you can elect to have insulation.

 
 

Copper Header Tanks

   
Nominal Total Height   Diameter For Use With Max.    Price
Volume (L) (mm)   (mm) System Volume of (L): (ex VAT) ( inc VAT)
           
20 285 x 400 213 169.20 213.04
35 400 x 400 557 180.00 226.00
25 285 x 450 280 171.60 215.92
35 350 x 450 526 172.80 217.36
40 385 x 450 658 174.00 218.80
55 480 x 450 1018 180.00 226.00
35 310 x 500 493 198.00 247.60
50 390 x 500 867 222.00 276.40
Insulation available if required - Please add 25.00
A delivery charge applies to these products
PRICES INCLUDE: FLOAT VALVE WITH COPPER FLOAT, COMPRESSION CONNECTIONS, FITTED LID

 

Stainless Steel Header Tanks

   
Nominal Total Height   Diameter For Use With Max.    Price
Volume (L) (mm)   (mm) System Volume of (L): (ex VAT)  ( inc VAT) 
           
18 291 x 375 246 180.00 216.00
20 291 x 400 277 177.60 213.12
25 291 x 450 351 159.60 191.52
40 388 x 450 717 168.00 201.60
35 291 x 500 433 192.00 230.40
55 388 x 500 887 210.00 252.00
65 450 x 500 1176 228.00 273.60
Insulation available if required - Please add 25.00
A delivery charge applies to these products
PRICES INCLUDE: FLOAT VALVE WITH COPPER FLOAT, COMPRESSION CONNECTIONS, FITTED LID

 

Square, oblong and bespoke header tanks

Metal header tanks are available in various shapes and sizes, or can be manufactured to your design and/or specification. For further information you are invited to call and discuss requirements.

Square copper header tank with lid

High temperature copper header tank showing metal valve and float

Highly insulated metal header tank suitable for high temperatures

Bespoke header tank to fit awkward shape

 

 

For more info please call

 

Note: Figures relating to system volume are indicative and should not be regarded as definitive.

 

Metal feed and expansion tanks - Copper and Stainless

 


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