如果大家看过我之前的文章，可能会有点映像，前面有提到过英国的双水龙头，有兴趣的朋友们可以点后面的直达链接查看：

为什么在英国留学会掉头发？怎么办？

英国的自来水（冷水）可以直接喝吗？

英国的水池，也就是洗手池，大多数地方是两个水龙头，如下图，左边是热水，右边是冷水：

英国双水龙头

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双水龙头里的水，温度可不一般，这个热水呢，是非常的烫，烫到你尖叫，而这个冷水呢，是非常的凉，凉到你怀疑到了南极，在这里你完全可以唱一首凉凉来表达此刻的心情。所谓冰火两重天指的应该就是英国的双水龙头了。可是，对于很多习惯了用一个水龙头的人来说，这就相当麻烦了，于是，有网友就想出了，买一个混合器Retromixer，然后根据两个水龙头的距离，将热水和冷水综合起来。

十升喵就不一样了，十升喵不买混合器，而是，将热水和冷水都放到水池里，或者放到脸盆里，然后直接洗脸hhhhhhhh

那么为什么英国的水池里有独立的冷热水龙头呢?

图片来源自BBC

一名28岁的意大利人克劳迪奥·马隆吉对BBC的记者说：“我一直想知道，为什么英国同一个水槽里会有两个水龙头完全分开呢？你要么被热水烧伤，要么被冷水冻僵，似乎没有其他选择。”

BBC随即采访了英国特许管道与供暖工程学会(Chartered Institute of and Heating Engineering)首席执行官凯文•威尔曼(Kevin Wellman)，关于这个冷热水龙头的问题，凯文•威尔曼回答道：“英国的热水和冷水分为两个水龙头，这一传统是可以追溯到热水和冷水分开使用的那个时代，当时分开的原因是通过交叉连接从而防止污染。

冷水来自水管，适合饮用，而热水将由通常位于阁楼上的一个本地蓄水池提供热水服务，同时这个设计造成了压力的不平衡，所以如果安装了不正确的水龙头和阀门，一股水流可能会冲到另一股。在英国，用水规定禁止热水和冷水混合，因为阁楼水箱里的水被认为是不安全的。

早在1965年，一项名为”CP 310“的操作规程就建议，只要可能，热水龙头就应该放在左边。所以，英国的热水都在左边的水龙头里，多年来，有报道称，坚持热水在左边的原因之一是，这样视障人士就能始终知道冷热水在哪一边了。即便是现在已经开始流行使用混合的单一水龙头，在英国仍然要求确保水在流出水龙头之前不会混合，而且还是保持，左边是热水，右边是冷水。”

下面是YOUTUBE小哥关于英国双水龙头的视频介绍：

为什么英国有独立的冷热水龙头？来自YOUTUBE小哥的见解 ​

小哥的英文字幕：

The mixer tap, brilliant invention, and yet something that seems to have passed Britain by. You'll get Americans coming over here and asking why our taps look like they're from the 1940's.

And even here, in my parents' bathroom. I'm visiting my folks this weekend and they just had a new bathroom put in separate hot and cold taps. And there are all sorts of theories about why that might be, generally revolving around 'Well we're British,' and 'Stiff upper lip,' and 'You know we don't need mixer taps. We've never had them.'

And well, that's partly true, but it also goes back to how houses in Britain were constructed after World War II. In most old British houses there's a cold water storage tank up in the attic. It's reasonably sized, about 250 liters, and that in turn feeds a hot water storage tank that's for the central heating, and for hot water in the bathroom, and in the kitchen, and so on.

But the trouble is that might not be entirely safe drinking water. Because that cold water storage tank, in some houses that weren't properly maintained, might have been open to the elements, or silted up, or covered with iron rust, or, in one particular case you can read about, have a couple of dead rats floating in it.

That water might technically not be drinkable. And under the regulations - I looked up the regulations, it is not counted as drinking water. The cold, meanwhile, at least certainly in the kitchen, and sometimes the bathroom, too, the cold water comes straight from the mains. That counts as drinkable.

So here's the thing: You have cold, safe, the regulations call it 'wholesome', drinking water, and you have, well, almost certainly safe but not technically, not legally under the regulations, hot water.

And never the twain shall meet. If you have a mixer tap, then technically, the unsafe hot water, in the worst case scenario, when there is a backwash valve failure and the mains turns off, that unsafe water could go back, backwash through all the systems, and go out to contaminate the rest of the street or the rest of the water system. That's not legal, therefor no mixer tap. You don't cross the streams. Nowadays, of course, it's a little bit different. This house had its hot water tank ripped out a few months ago. The attic is now just a big empty space again. And, well, there is a very modern, shiny bit of technology downstairs that heats up water on demand. All new built houses go this way. If they've got mixer taps, it'll be absolutely fine. But...

I remember being told as a kid 'never drink from the hot water tap.' And that stuck with me. Even now, if there is a mixer tap and I want to drink from it, I will run the cold water for a few seconds just to make sure anything that's unsafe has come out of it. Even now old habits die hard. And sometimes these things just feel a bit safer.