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Why does tub have instant hot but shower not? Login/Join 
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I'm filling up a tank for the humidifier this morning, and the tub, which I rarely use, gives me instant hot water. Like, within seconds. However, a mere five feet away, it takes minutes for hot water to come from the shower head. How can this be?


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Posts: 5241 | Location: Commonwealth of Virginia | Registered: January 15, 2007Reply With QuoteReport This Post
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Hold old is your house / plumbing?

I have a 'newer' house in which every fixture has a separate line.

There is a component called a 'pressure balancing unit' which can go bad after a period of time.

I replaced a few of these in showers around the house and they are back within spec. My showers are Kohler brand - don't know if other brands are similar.

https://www.amazon.com/Kohler-...t-reviews/B001GZZDCS


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Posts: 8940 | Location: Florida | Registered: September 20, 2004Reply With QuoteReport This Post
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basically - it is the unit that mixes the hot and cold water in the ratio you are turning on the dial.

apparently - with Kohler at least - they can go bad after a period of 5-10 years depending on the usage.

which may be why your frequently used fixture is crapping out but the seldom used one is still working fine.

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Posts: 8940 | Location: Florida | Registered: September 20, 2004Reply With QuoteReport This Post
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Are you supposed to use hot water in a humidifier?


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Posts: 31126 | Location: Elv. 7,000 feet, Utah | Registered: October 29, 2012Reply With QuoteReport This Post
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Are you supposed to use tap water in a humidifier?
 
Posts: 5020 | Location: Texas | Registered: July 22, 2008Reply With QuoteReport This Post
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quote:
Originally posted by drabfour:
Are you supposed to use tap water in a humidifier?


The first floor of our house has a separate HVAC than the second floor. The entire first floor has a humidifier connected to the system at the furnace and uses city tap water.


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Posts: 4037 | Location: New Jersey | Registered: December 06, 2010Reply With QuoteReport This Post
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Probably just depends on how your water lines are run. I live in a 70 year old house. My kitchen sink is physically the closest tap to my water heater, yet takes the longest time to actually get hot water. When investigating this, it turns out the hot water from the water heater runs clockwise around the perimeter of my house, and the kitchen sink is actually the last stop. When I want hot water in my kitchen, I actually go turn on the hot water in the bathroom tub until it gets hot, then turn on the kitchen sink.




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Posts: 3595 | Location: Two blocks from the Center of the Universe | Registered: December 30, 2004Reply With QuoteReport This Post
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quote:
Originally posted by 4MUL8R:
I'm filling up a tank for the humidifier this morning, and the tub, which I rarely use, gives me instant hot water. Like, within seconds. However, a mere five feet away, it takes minutes for hot water to come from the shower head. How can this be?


Perhaps your shower has a flow-reduction head, slowing the supply of hot water.
Your bathtub wouldn't likely have that, which would speed up the delivery of hot water.
 
Posts: 1801 | Location: WA | Registered: January 07, 2009Reply With QuoteReport This Post
Funny Man
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Flow rate. Your shower likely has a low flow head on it and puts out less volume by design. With less volume flowing it takes longer for the hot water to get to the shower head. Remove the shower head and turn on the hot water to test this.


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Posts: 7093 | Location: Austin, TX | Registered: June 29, 2010Reply With QuoteReport This Post
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