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I have to turn on lavatory faucet at the same time I'm running the shower so when I taking a shower the water doesnt go from hot to cold. It seams that maybe the hot water demad that the shower requires is not enough to keep the shower water hot while in use. this ia a Rinnai tankless hot water heater

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This is not an uncommon problem with 'flash heaters' of this type; for safety, they all require a certain minimum of flow before the gas supply is turned on. Some brands/models have a factory-set adjustment for the minimum flow rate.
You might locate the mfr.'s website, contact them and describe your problem. This can also be caused by the modern flow-limited shower heads not allowing enough water to flow to keep the heater turned on.
If you have a retired shower head, you might try replacing the one currently used to see if it allows enough flow to allow proper operation. Either way, it is a waste of water.

Posted on Aug 03, 2010

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Posted on Jan 02, 2017

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LADBS Plumbing inspector says we need a temperature regulator for an In-Wall Lavatory Kit in a tub. The tub does not have a shower nor a wand? Which section of the code indicates this?


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Water is either hot or cold - no in between.


I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

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