Greetings. I have a Rennai R94-LSe that was installed in 2009 by the previous owner of my house. Warm climate. It has been very slow to heat water since the get-go, taking a full 2 1/2 minutes to feel warm (kitchen warm tap wide open) at a distance from the heater of roughly 50 feet. I purchased flush equipment and flushed 2 gallons of white vinegar through the unit for 2+ hours, and changed one dip switch on the unit as prescribed in the manual to account for our 2400 foot elevation. There is 1" gas line to the unit. None of this has made any significant improvement. What would be the next best step for troubleshooting this? TIA for your thoughts.
I would check the gas pressure at the burner. It should be 3.5 inches water column on the manifold. Hope this helps.
SOURCE: 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?
SOURCE: New water heater, shower hot then only warm water in 5 minutes
try this, set the bottom therostat if it is electric , 10 degrees hoter than the top is set , if gas have no ideas
SOURCE: takes a long time to heat water
If you are using a 3/8" copper line for your gas, get it replaced ASAP. It will fail. 1/2" Black Iron is required with natural gas. 50 gallons is a lot of water to heat. Look on the heater label for the recovery rate.
SOURCE: hot water tap only warm water in bathroom but hot in kitchen
Usually when you are having a problem at only one fixture, and not any others it is a sign that you have a faulty fixture. Hope this helps.
SOURCE: vinegar flush
You should not have to flush unless the code LC comes up. but here is the flushing diagram.
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