Improving Hot Water Distribution
我和我的妻子正在购买2007年建造的房屋。它有一些问题，例如检查员指出的问题：
“恒温器设置为高于通常的背景g to provide 120 F water to kitchen sink. The water pipes are buried in the slab, which serve as a heat sink. Even after several minutes, the water at the sink barely gets hot, so a lot of water is wasted. There is a hot water recirculation system in the Owner’s Bathroom, close to the water heater. Water circulation systems are put at the plumbing fixture, usually a sink, furthest away from the water heater, which in this case would be either bathroom at the front of the house. Water may be recirculating, but it’s benefitting only the Owner’s Bedroom. A plumber can put a hot water circulation control valve on either of the bathroom sinks.”
车主的浴室固定装置实际上位于最接近热水器的房间里。因此，我应该用循环泵（请参阅图片）替换一个位于一个洗手盆下方的当前阀门，还是最好将泵安装在热水器（也许带有遥控传感器），然后简单地安装”根据需要将热水推入系统？
GBA细节库
由气候和房屋部分组织的一千个建筑细节的集合
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水槽下方或靠近的小型电动罐或小型电池将保证热水。2.5加仑的水槽下方会给一分钟的热量，并且按需无限，EEMAX使它们在入口设定点温度下闭嘴。循环有点痛苦。如果线条不是冰冷的，那么小3kW左右可能会起作用。
多谢你们。
我想主人浴室中的热水响应很好。厨房真的很慢，还有另外两个浴室距离更远。如果我必须在效率（较低的能源成本）和性能（更快地获得热水）之间进行选择，那么我会选择后者。我认为改善热水再循环在这里更有意义。
如果您的问题仅在厨房水槽处，请考虑在水槽下方添加5加仑的加热器。第二加热器的能量将比再循环系统少得多。5加仑是厨房水槽的大量热水。
With that said I did build a recirculation system I turn in any hot water faucet for a few seconds then back off this starts the pump and the pump continues to run until the loop is up to the set temp.
沃尔塔
+1用于小用水加热器。
如果将热水管线埋在平板中并没有绝缘（听起来可能是这种情况），则如果始终运行，再循环系统将浪费大量的能量。基本上，您将将热水管线转换为带有该板的小辐射加热系统。至少，请确保您使用仅在需要时运行的按需类型的循环系统之一。不幸的是，像这样的系统在像您这样的情况下都没有持续的操作系统。
A small point of use water heater under the sink will make hot water pretty much instant for things like handwashing. Supplying that small water heater from your hot water line will limit how much heating that small water heater has to do, which will have the effect of appearing to increase the tank capacity of the unit a little (you'll get more hot water until you run out), and by the time you run out of hot water from the little tank, you'll probably have heated up the main run and still be OK.
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I appreciate everyone taking the time to noodle this one around. I'm open to using a POU water heater if that's the most cost-effective and efficient way to address the problem.
FWIW，平板下的无绝缘管是标准实践（CZ3）。我的第一所房子已经安装了聚丁烯，并且您期望它也能解决。:-(
Second time around I used the class-action cash to put in copper.
在这种情况下，它是平板下的CPVC，这也不会给我带来很多信心。我们所在的租金也有CPVC。自从业主在热水管线上安装了grundfos泵以来，这里也肯定有热水的问题。通过该设置，最遥远的固定装置在大约15秒内获得热水。
我用聚丁烯屋里的grundfos泵做了类似的事情。在这种情况下，水管工从最远的固定装置回到热水热水器中，在阁楼中运行了一条绝缘的循环系统（本地代码允许）。热水输送几乎是即时的，但是泵只持续了大约五年，才能发出。
我会和水管工一起在这一条上得到。他很可能在大量生产房屋上看到了这种配置。无论如何，我都需要他来替换所有这些推力关闭。它们无法修复，并且在事情侧向时不工作而臭名昭著。我的最后一所房子是三层楼的城镇房屋，每个固定装置上都有这些东西。
Tom, that valve setup seems to be SOP around here. I think they are trying to do a thermosiphon loop. I guess. Maybe. You may be right about there being the recirculating line.
仅当热加热器位于环的底部（例如地下室）时，热量只能工作，因为您需要对流电流才能使这些循环运行（这就是我自己的系统的工作方式）。如果您没有地下室，那么您可能没有热刺。
我不喜欢斜坡内管道，除了您没有太多选择的排水管。如果您必须这样构建，PEX是最好的选择，但是我仍然尝试找到将供应线排除在平板之外的方法。
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我同意您在斜坡内管道上的观点。不应该在我的第一所房子上那样，但是建造者并不是要遵循规格。
“但是建造者并不多遵循规格。”
我不会付出这样的建造者...
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账单,
The plumbing was the first of many disputes with this builder. For context, we did this house 30 years ago and there really wasn't anyone to turn to for advice. When I talked to our architect, he said, "I didn't give you the name of a builder I would recommend. I gave you the name of a builder you could afford." Well, thanks for that.
房子很好。（当然可以更好。）但是整个过程令人难以置信。
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I'm pretty sure the valve's MIX output is tied back into the cold water feed bellow the cabinet.
这与使用冷水管线作为recirc返回的舒适阀设置相同。
只要进入混合阀的热水很冷，阀门就可以打开，从而使流从冷水管道流回。一旦水达到温度，阀门就会在寒冷的一面穿梭并停止流动。
它是缺乏专用循环系统的相当不错的解决方案。它还具有仅重新循环以保持供应线热的好处。缺点是冷水饲料将是最初抽签的不温和。对于厨房水槽来说，这可能是一个问题，您要喝冷水来喝酒。
由于已经为这种类型的循环设置了房屋，因此您还可以在任何其他水龙头上添加另一个混合阀（安装更容易安装），您想要更快的热水。
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Just looked a little closer at that valve. It looks to be a Watts mixing valve whereby you are correct that the mix goes out the bottom. Contrary to every mixing valve I've ever installed in the past 40 years. But it still doesn't make much sense to send cold or mixed water back to the hot water heater.
大多数循环系统将一部分热水馈回加热器，这就是为什么需要泵和止回阀的原因。如果没有支票或泵，则将进入冷水，因为返回线通常被绑在加热器的冷水饲料中。
Without a pump, this won't work. You need a pump at the tank inline with the hot water to the house. Pretty much the same as the Watts recirc install.
P.S. About the only way I can think of getting it to work without a pump is with a venturi tee on the cold side of the water heater.
This way a hot water draw would create enough pressure to pull the mixed water backwards through the tap cold water feed.
This is the best solution . Smart plug has 2 settings for pump run strategy . You can get rid of the stupid mixing valve in the master . Order a second bypass valve and install them at the furthest fixtures . switches allowing circ to be turned on only on demand can also be employed . This system uses the cold water line as the return back to the heater and they work well . The circ sizing will reduce possible erosion through lower flow rates and protect the slab piping also .
https://www.tacocomfort.com/product/hot-linkplus-e-ecm-high-felcipication-instant-hot-water-system/
Thanks, Richard. I like your suggestion and will discuss it with the plumber.
艾莉森·贝莱斯（Allison Bailes）只是写了这个问题：热水为什么要花这么长时间？。根据他的文章，我认为他建议您安装需求型再循环泵。