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[问与答] 零冷水之小循环方案疑问

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燃气热水器
方案图:
https://pic.imgdb.cn/item/6683c084d9c307b7e9c524aa.png

疑问:
假如
1. 需要热水的设备为:1 号洗菜盆,2 号花洒,3 号洗脸盆;
2. 参考方案图,我将这 3 个设备只接热水管,不接冷水管;
3. 热水器开机,并设置 39 度;
4. 这 3 个设备能出 39 度左右的热水就行了

这个想法现实吗?
1. 我的理解是,水温我都调整好了,干嘛还要“用水点”连接冷水管进行混合热水调温?
2. 不用热水的时候,我把热水器关掉,“用水点”依然能出水就行。
我也咨询了客服,全部都是建议 3 管方案。
有人说洗澡的时候,每个人喜欢的温度不一样,这点可以忽略,先不考虑。

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