Question about Bosch & Tankless LP Hot Water Heater
When our Bosch tankless water heater was installed last winter, it worked great. The hot water now warms up as usual but turns cold within a couple of minutes. We have to turn the water off for a few seconds and then back on and it will get warm again but doesn't last very long. It is very frustrating to be in the shower and the hot water turns cold within a couple of minutes.
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 :)
Posted on Aug 20, 2010
Testimonial: "I will give that a try because it is a long time until winter! Thanks."
What is the model of your Bosch water heater?
Posted on Jul 26, 2010
It is likely that you purchased a tankless hot water heater with a lower flow rating than needed. Tankless water heaters are rated to provide hot water at a designated flow level. There is a good chance that your shower uses the water faster than your tankless water heater can heat it up.
Either get a beefier heater capable of heating up more water faster, or purchase a low-flow shower head. I would go with the shower head as it is much cheaper and you'll actually save money as you saver water too.
Posted on Jul 17, 2010
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Posted on Jan 02, 2017
It sounds like you have a plumbing cross over or a poor install. Check boschhotwater.com to find a service technician and have a Bosch service provider look at it.
Posted on Apr 11, 2010
these units need lots of flow to start and run. Set the temp on the unit lower and the people in the shower will have to use more hot and less cold which will make the unit more stable.
Posted on Jun 07, 2010
E4 error code on Bosch tank less hot water heater, this is what it says.....
E4: Backflow temperature sensor over 309°F. The appliance will close the burner and lock.
Check combustion air and backflow vent piping for blockage.
Check if secondary fan connections are disconnected.
Check venting specifications are met. Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
Check sensor resistance (see Fig. 61, page 44 in manual).
Posted on Jul 09, 2011
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