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View the thread, titled "Central mixing valve near unvented cylinder" which is posted in UK Plumbers Forums on UK Plumbers Forums.
Ideally no why do you ask ?
If the hot is mixed centrally I was thinking that this is more efficient than 15m of v hot water travelling to the basin, being mixed there and then cooling down again in the long pipe run.
Instead, why not send pre mixed water everywhere at 40deg?
Legionella would be a problem
Thanks Shaun.
Could you explain why this is an issue?
If my cylinder water is still at 60degC, is there a risk of Legionella just in the hot pipework between mixing valve and taps?
I expected this would be no different risk than the case of a combi boiler putting out 40deg C water that then cools in the equivalent pipework.
Sorry for persisting, just trying to understand properly why it’s not generally done.
Thanks again for your advice.
Andy
Could you explain why this is an issue?
If my cylinder water is still at 60degC, is there a risk of Legionella just in the hot pipework between mixing valve and taps?
I expected this would be no different risk than the case of a combi boiler putting out 40deg C water that then cools in the equivalent pipework.
Sorry for persisting, just trying to understand properly why it’s not generally done.
Thanks again for your advice.
Andy
Good point, thanks.
I was thinking that hand-safe water temp is the same for kitchen sinks and wash basins. But maybe they’re different as only adult hands use the kitchen sink.
Is that the logic?
I understand that combis are generally low risk. I suppose I thought that as long as the cylinder is at 60, the legionella risk is eliminated so it doesn’t matter what temp the water in your pipes is.
Happy to learn that this is not the case though.
Thanks very much for the discussion.
I was thinking that hand-safe water temp is the same for kitchen sinks and wash basins. But maybe they’re different as only adult hands use the kitchen sink.
Is that the logic?
I understand that combis are generally low risk. I suppose I thought that as long as the cylinder is at 60, the legionella risk is eliminated so it doesn’t matter what temp the water in your pipes is.
Happy to learn that this is not the case though.
Thanks very much for the discussion.
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