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PostPosted: Sat May 05, 2018 8:37 pm 
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I have always assumed that hot tap water from a combi boiler is bad to drink because the heat exchanger which is used for the central heating circuit is also used for hot tap water and that a small amount of residual central heating circuit water ends up coming out of the tap when they are switch over. Is this right?

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PostPosted: Sun May 06, 2018 10:00 am 
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No.

The tap water and system water never mix in the slightest, unless the plate has a pin hole in it, in which case your pressure will keep going up unexpectedly.

But why would you want to drink hot tap water?

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PostPosted: Sun May 06, 2018 11:25 am 
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Quote:
But why would you want to drink hot tap water?


I assume it's to fill the kettle which boils quicker as the water is already hot. I do the same and have done for years, never done me any harm (I don't think).


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PostPosted: Sun May 06, 2018 12:56 pm 
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The reason why people don't want to drink water is because it can be contaminated with lead and other metals from older pipes or from a water tank. If this doesn't apply to you then I see no reason why you can't if you don't taste any difference between that water and cold water boiled in a kettle.


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PostPosted: Sun May 06, 2018 2:12 pm 
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Yeah my niece asked about it as she uses it for the kettle if the hot water has already been run through to the tap. I had been warned off this and assumed that the heat exchanger in the combi was used for both hot water and the heating system.

So the primary heat exchanger runs the heating and also feeds the secondary for the hot water generally?

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PostPosted: Sun May 06, 2018 2:41 pm 
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By the time the boiler fires up etc is it not just as cost effective to boil the kettle?

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PostPosted: Sun May 06, 2018 5:26 pm 
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I do not think it is a good idea as the water is a bit stale and it has been heated through the domestic hot water system and cooled down in the pipes. So you have to wait for the hot water to be heated and reach the tap which I feel is a bit of a waste in water and time. I have little patience at the best of times and get bored filling the kettle just with cold let alone waiting for warm water.

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PostPosted: Sun May 06, 2018 6:25 pm 
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steviejoiner74 wrote:
By the time the boiler fires up etc is it not just as cost effective to boil the kettle?


Maybe Stevie but it's certainly faster.


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PostPosted: Sun May 06, 2018 8:06 pm 
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Puma wrote:
Yeah my niece asked about it as she uses it for the kettle if the hot water has already been run through to the tap. I had been warned off this and assumed that the heat exchanger in the combi was used for both hot water and the heating system.

So the primary heat exchanger runs the heating and also feeds the secondary for the hot water generally?

Yes the water from the primary heat exchanger just runs along side the cold water to be heated in the plate.

The heat transfer through the thin metal in the plate is what heats the hot water, unless you have an Intergas combi and the cold water runs through a separate set of smaller pipes in the main heat exchanger, doing away with the need for a plate.

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