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Re: how to fix my tankless hot water?
What is it doing, I would first check the inlet water screen and make sure that it's clean. shut off the water going to the unit and the screen is right after the shut off, unscrew it and clean it. replace and turn the water back on. you can ask for me again if this does not help
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Ok i intall tankless water heaters and sell them and repair them . The trouble your are hving is more than likely ,the mixing valve on your shower has a ajustment on it to prevent you from burning your self . that is the number one reason in showers when water never get to temp . What it is doing is addng cold water to your shower for you bummer . Take handle off and adjust water temp to your hottest setting . Some times you have to remove the low flow washer in shower head to get the right flow . also every time you start up your hot water it shouldbe set all the way ot other wise withe the battery 2 D models the unit will not sence flow and shut off the unit ,with some units it is a fine balancing act to get them adjusted right. If your buying a tankless water heater always buy a blower type unit that has a computer that runs it . You will be happy . If the Battery operated unit is for a cottage or a smallcabin then your just going to have to fix the pumbing to make it work right many of the safety features of the newer showers are not made to work well with tankless water heaters .
I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!
Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)
There are several things I would look for: -Flashing burner light (indicates an error code) -Trying flowing more hot water. In the summer alot of times you'll flow less hot water because your cold water is warmer. If you flow additional hot water at your shower, it will ensure the unit stays firing -If the unit doesn't fire at all, you may have debris in your cold water filter or a stuck flow sensor. Call tech support to help you with cleaning a flow sensor.
This happens with Nortiz heaters. They just **** out. Likely the installation is very bad, but the unit can not tolerate that and it just dies. I recommend getting a Bosch 2700 or 715. If you want great efficacy, get the C-800. But follow the instructions! If it is installed correctly and you have the CO2 levels adjusted when it is installed, you will be very happy.
Sounds like you have a problem with water flow. Since your ground water
is warmer in the summer, you mix less hot and more cold in order to get
the same warm temperature. If your hot water flow gets low enough, your
tankless will start to "short cycle" in order to prevent scalding. Use
one of these three methods to increase your water flow at the shower:
1) Clean your shower head and descale 2) Widen the hole in the showerhead's flow restrictor 3) Remove your flow restrictor entirely
Tankless water heaters normally take a little longer than a regular heater to provide hot water because they have to start and get warmed up. I'm guessing the heater uses a pilot light and that the short amount of hot water when you turn on the tap is hot because when the water is sitting still in the heater the heat from the pilot light is enough to get it hot. The tub faucet will get hot a lot faster than the shower because it lets a lot more water through and empties out the pipes faster than the shower. You could probably speed things up by letting the tub faucet run on completely hot for like 10-15 seconds and then turning on the shower.
you need to unplug the unit, wait for 30 seconds reset the temp to the lowest temp, then try it, if this does not work it might have done something to the circuit board, are you on a gfi out let it needs to be there is water and ele, and should be on the gfi with a reset on it,,