Or if the hot water is potable, as per a combi boiler.
Bad installation then.
Bad installation then.
Does this mean that hot water is always defined as being non-potable? And if so, a) why? b) doesn't that mean that in practice the majority of cold water from a mixer tap is non-potable (because it's very rare the mixer is all the way over to 100% cold)?Or if the hot water is potable, as per a combi boiler.
Kim this is not possible, under the water regs, potable water is class 1, water with an aesthetic change e.g. of temperature, is class 2 and requires a back flow prevention device. The classes make their way through to class 5 for containing toxins, carcinogens etc. and the resilience of the device gets more stringent the worse the fluid.
The reason that the combi boiler doesn't need a backflow protection device is because the water is from the source (mains) and therefore at the same pressure and cannot reverse the flow, if the combi boiler was being fed from a header tank in the loft the pressures would be different and the backflow protection device would be required.
Cudz, your stretching my knowledge of the regs to the very limit.Sorry! And thanks for the answer, including the link.
Nothing wrong with that, I was just caveating the reply rather than seeming too authoritative.Cudz, your stretching my knowledge of the regs to the very limit.Sorry! And thanks for the answer, including the link.
Nothing wrong with that, I was just caveating the reply rather than seeming too authoritative.Cudz, your stretching my knowledge of the regs to the very limit.Sorry! And thanks for the answer, including the link.
For the water that comes out of the Spinal Tap presumably.Nothing wrong with that, I was just caveating the reply rather than seeming too authoritative.Cudz, your stretching my knowledge of the regs to the very limit.Sorry! And thanks for the answer, including the link.
Looking at that Cat5 description, what happens if you have more than one fluid posing a serious health hazard? Does it go up to 11?
I don't know that wras regs ever said you cannot mix hot and cold in a tap body - otherwise all telephone handset bath/shower taps would have been non compliant
What they do say is thou shalt not feed dead pigeon gazpacho from thy loft tank into the mains water system if we turn it off
In t'olden days the bath tap was generally fed from the loft cold tank assuring it couldn't back feed but kitchen taps often used mains cold and gravity hot. The easiest approach to guarantee compliance was the two tube non mixing approach
In your case cold coming out of a disassembled mixer tap is no indicator of non compliance. Even if correctly fitted with non return valves in accordance with regs this would still happen. Water will always find the easiest way to release it's pressure so if there's a dirty great hole in the tap body it will come out of there
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I don't know that wras regs ever said you cannot mix hot and cold in a tap body - otherwise all telephone handset bath/shower taps would have been non compliant
What they do say is thou shalt not feed dead pigeon gazpacho from thy loft tank into the mains water system if we turn it off
In t'olden days the bath tap was generally fed from the loft cold tank assuring it couldn't back feed but kitchen taps often used mains cold and gravity hot. The easiest approach to guarantee compliance was the two tube non mixing approach
In your case cold coming out of a disassembled mixer tap is no indicator of non compliance. Even if correctly fitted with non return valves in accordance with regs this would still happen. Water will always find the easiest way to release it's pressure so if there's a dirty great hole in the tap body it will come out of there
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Also if you had an old style open hot water system with a header / expansion tank in the loft then the Hot and Cold were at the same pressure. There would also have been a Type AB air gap at the filler of the header tank. After this the water board aren't worried as backflow to the mains or your kitchen tap simply isn't possible.
I once had dead pigeon coming out of the bath tap. Bird Flue?One cottage in Wales had so many dead bats in the header tank that I had to back-flush with a peice of hose between cold and hot bath tap. I then cleaned the header with a wet n dry vacuum. Many years ago when I had a younger persons immune system. Apparently the children were getting sick - but they did actually drink the bathwater.
Cudz, your stretching my knowledge of the regs to the very limit.
I would say that hot water might be potable or 'wholesome' under the terms of the regulations, but because mains tap water shouldn't be tepid as that would potentially be unpaletable there is a requirement to prevent mixing. See here for the fluid categories https://www.waterregsuk.co.uk/guidance/backflow-protection/backflow-protection/backflow-protection/what-is-a-fluid-cate/ (https://www.waterregsuk.co.uk/guidance/backflow-protection/backflow-protection/backflow-protection/what-is-a-fluid-cate/)
With my water treatment hat on the other reason I wouldn't want to mix in hot water is the residual disinfectant (chlorine or chloramines) that are there to suppress any microbiological contamination after treatment that might make the water unsafe. Heating the water will reduce this residual and will therefore mean that the water once cooled could easily become a viable media for biological growth, see legionella's etc.
Cudz, your stretching my knowledge of the regs to the very limit.
I would say that hot water might be potable or 'wholesome' under the terms of the regulations, but because mains tap water shouldn't be tepid as that would potentially be unpaletable there is a requirement to prevent mixing. See here for the fluid categories https://www.waterregsuk.co.uk/guidance/backflow-protection/backflow-protection/backflow-protection/what-is-a-fluid-cate/ (https://www.waterregsuk.co.uk/guidance/backflow-protection/backflow-protection/backflow-protection/what-is-a-fluid-cate/)
With my water treatment hat on the other reason I wouldn't want to mix in hot water is the residual disinfectant (chlorine or chloramines) that are there to suppress any microbiological contamination after treatment that might make the water unsafe. Heating the water will reduce this residual and will therefore mean that the water once cooled could easily become a viable media for biological growth, see legionella's etc.
Er, chlorine? Don't have any of that stuff in my water... Yes, I know most folk do, but I don't.
That reminds me of our physics teacher, who loved to go on about how German regulations were so much more advanced (this was early 80s, so not a Brexit thing) once expanding this into plumbing (not part of the physics syllabus!). He definitely had a rant about header tanks but I can't remember precisely what. I think they might be banned in Germany?My chap cannot understand why our taps in the UK are so weird (and why we don't have washing machines in the bathroom but in the kitchen, which is another topic).
Cudz, your stretching my knowledge of the regs to the very limit.
I would say that hot water might be potable or 'wholesome' under the terms of the regulations, but because mains tap water shouldn't be tepid as that would potentially be unpaletable there is a requirement to prevent mixing. See here for the fluid categories https://www.waterregsuk.co.uk/guidance/backflow-protection/backflow-protection/backflow-protection/what-is-a-fluid-cate/ (https://www.waterregsuk.co.uk/guidance/backflow-protection/backflow-protection/backflow-protection/what-is-a-fluid-cate/)
With my water treatment hat on the other reason I wouldn't want to mix in hot water is the residual disinfectant (chlorine or chloramines) that are there to suppress any microbiological contamination after treatment that might make the water unsafe. Heating the water will reduce this residual and will therefore mean that the water once cooled could easily become a viable media for biological growth, see legionella's etc.
Er, chlorine? Don't have any of that stuff in my water... Yes, I know most folk do, but I don't.
Based on your timezone you are either on a private supply and reliant on the short time and distance between the UV unit and the tap to prevent recolonisation or you are in one of the areas of the Netherlands that operates a chlorine free distribution system.
That reminds me of our physics teacher, who loved to go on about how German regulations were so much more advanced (this was early 80s, so not a Brexit thing) once expanding this into plumbing (not part of the physics syllabus!). He definitely had a rant about header tanks but I can't remember precisely what. I think they might be banned in Germany?My chap cannot understand why our taps in the UK are so weird (and why we don't have washing machines in the bathroom but in the kitchen, which is another topic).
They always have mixer taps and think two separate taps is bonkers.
I have seen occasional separate taps in Germany and they usually have a "hot" and "cold" text on them, so they are quaint English design ones.
It seems there's no legal requirement in UK to replace lead piping. Presumably introducing such an obligation would cause Daily Mail share price cancer.