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how does a F&E tank work?

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Old 04 March 2007, 06:48 PM   #1
ismail
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Default how does a F&E tank work?

Hi Folks,
I'm looking into installing a DPS GXV 250 litre which uses a F&E which I shall have in the loft.

Am I correct in thinking that when the water in the system (for DHW and CH) is heated up and it expands, any surplus will go up from the heat bank/cylinder and into the expansion tank and when it cools down, it shall feed back into the primary system?

I'm asking this so I know that it's always the same amount of water in the primary system and so I know how much inhibitor it should contain.

Also, how large does the F&E tank need to be and is it generally covered to prevent evaporation?

Thank you kindly
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Old 05 March 2007, 01:37 AM   #2
Mog
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Quote:
Originally Posted by ismail View Post
Hi Folks,
I'm looking into installing a DPS GXV 250 litre which uses a F&E which I shall have in the loft.

Am I correct in thinking that when the water in the system (for DHW and CH) is heated up and it expands, any surplus will go up from the heat bank/cylinder and into the expansion tank and when it cools down, it shall feed back into the primary system?

I'm asking this so I know that it's always the same amount of water in the primary system and so I know how much inhibitor it should contain.

Also, how large does the F&E tank need to be and is it generally covered to prevent evaporation?

Thank you kindly
To be honest the content of your question really shows your lack of knowledge and safety comes into it, get a professional to install...no insult intended.

Mog
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Old 06 March 2007, 01:11 AM   #3
ismail
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I guess I should have been more clearer. I am not planning to install it myself but have someone install it for me. No insult taken since my post wasn't exactly clear on this.

One of the main reasons I'm asking this question is to ensure I have a passing knowledge of some things, not as an expert, but enough to know at a high level what I'm having installed and will be using.

I guess a good analogy would be with a car: it's good to know how to check the engine oil level or the water in the radiator even though you don't know all the details and wouldn't try to fix things (not me anyway).

thanks and regards.
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Old 08 March 2007, 07:41 PM   #4
ismail
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Can anyone confirm if my understanding of feed and expansions tank is correct or not? Much appreciated
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Old 09 March 2007, 08:07 PM   #5
Butty
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You are pretty well correct.
F & E tanks now have to be installed more or less as per cold water supply tanks (for backflow prevention and insulation), but don't need the lid to be close fitting with a vent or have a screened overflow.
Sizing is more to do with what the plumber can get hold of to fit the space - usually 25 litres.

Hot water flowing into the F & E tank is usually a sign of a system problem - the expansion should be contained in the pipework leading to the F & E tank.

Nick
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banks, dps, ev, fe, full, gxv, gxv250, heat, heating, recognise, sizing, system, tank, tanks, water

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