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Old 10-18-2017, 06:53 AM   #1
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Hot and cold lines connected. WTF?


New house and I'm about to winterize it and I noticed this oddity. There is an outdoor shower and if I'm looking at this correctly both the hot and cold lines are connected together. Would this cause issues, wouldn't this warm up the cold water and cool down the hot water or no because the only way they flow is if the shower is on and they then just mix and flow out?
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Old 10-18-2017, 07:18 AM   #2
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Re: Hot and cold lines connected. WTF?


That piping is probably part of a hot water recirculation system. You should also see a recirculation pump and check valves in both the hot and the cold lines. These allow the water to flow only one way.
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Old 10-18-2017, 07:27 AM   #3
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Re: Hot and cold lines connected. WTF?


It's a cheap way to temper the water for the outdoor shower so it's not so cold. The valve on the hot controls how much hot is added to warm it slightly so it's not so shocking at the shower.

Family has a condo at the beach I have seen tons of these set ups.
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Old 10-18-2017, 07:30 AM   #4
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Re: Hot and cold lines connected. WTF?


Quote:
Originally Posted by KC_Jones View Post
It's a cheap way to temper the water for the outdoor shower so it's not so cold. The valve on the hot controls how much hot is added to warm it slightly so it's not so shocking at the shower.

Family has a condo at the beach I have seen tons of these set ups.
Interesting, no no adverse affects then? It's off, so I'm assuming when they had people over they might turn it on a little to make the water warmer and probably shut it back off after. I'll probably remove it and add a proper hot/cold but wanted to make sure it wasn't bad to begin with.
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Old 10-18-2017, 09:50 AM   #5
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Re: Hot and cold lines connected. WTF?


I wouldn't say no adverse affects. You have hot tied into cold so you could see weird things. If you don't have an expansion tank that is a place the hot can push into the cold line. Also because of temperature differential you could get some weird ghost flow again hot into cold or something.

A flow check could possibly address the "issue", but your solution of a regular hot/cold at the shower would definitely be the best.

I wouldn't be concerned, though I don't know if there is any code that this may violate.
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