citiCite
FORUMS PHOTOS GROUPS EVENTS WIKI
CREATE ACCOUNT | LOGIN
Mueller Community (change)
Forums
You are NOT logged in.
RSS

Tankless hot water heaters and variable hot water
All of the following posts have been contributed by citiCite members.
Viewing 1 to 8 of 8 posts
Page Header Image
Forum Navigation

Recent Forum Posts

Upcoming Events
Sorry, but there are no upcoming events.

No Image Available
Christopher Blythe
Mueller Community

Posts: 12
Joined on March 15th, 2011
Tankless hot water heaters and variable hot water
by Christopher Blythe on January 29th, 2014

We have a tankless hot water heater in our home, and over the past few months, I've noticed that our hot water cycles between hot and cold. I was wondering if anyone else has experienced this and figured out the cause? I suspect it's due to lower water pressure or scaling on the heating elements (since our unit has never been serviced or de-scaled). Anyway, was hoping someone on the forums would have some useful information. I'm also curious to know if anyone has tried to flush/de-scale their tankless heater on their own?
 
User Profile Image
dmick
Mueller Community

Posts: 129
Joined on January 18th, 2009
Tankless hot water heaters and variable hot water
by dmick on January 30th, 2014

Christopher; I suspect the cycling from warm to cold is simply the water sitting in insulated and cold stretches of pipe and then traveling to your faucet when it's turned on. After a couple of minutes of running the hot water, does it continue?
 
User Profile Image
Ron Garza
Mueller Community

Posts: 72
Joined on January 14th, 2013
Tankless hot water heaters and variable hot water
by Ron Garza on January 31st, 2014

My friend in Ecuador had the same problem. His was propane powered. When the hot water faucet is opened, the drop in pressure causes contacts to signal (turn) the system on and heat the water. Great idea! However, if those contacts are oxidized from repeated use, the signal fails. Another failure point is the valve that opens the propane tank. If yours is electric, this last item would not apply. Google for a schematic and info on your system if you need that.
 
User Profile Image
Katherine V.
Mueller Community

Posts: 56
Joined on October 27th, 2009
Tankless hot water heaters and variable hot water
by Katherine V. on January 31st, 2014

We were having the problem in particular in our showers where the water would turn cold when we adjusted the temperature. Custom Plumbing, who installed our Rennai, came over yesterday and investigated. He said the heater is working fine, but that the water flow is very low due to scale build up in the shower-heads (more explanation but this is the gist). We can fix by removing the shower-heads and soaking 24 hrs in distilled white vinegar or purchasing newer higher flow ones. I haven't tried it yet but this is the scoop as I know it. Hope it helps!
 
User Profile Image
Ron Garza
Mueller Community

Posts: 72
Joined on January 14th, 2013
Tankless hot water heaters and variable hot water
by Ron Garza on January 31st, 2014

Yes it does help, thanks. RE: We can fix by removing the shower-heads and soaking 24 hrs in distilled white vinegar or purchasing newer higher flow ones.
 
User Profile Image
Susan Egan
Mueller Community

Posts: 57
Joined on April 29th, 2013
Tankless hot water heaters and variable hot water
by Susan Egan on January 31st, 2014

De-scaling may also be done the lazy way -- with the shower head in place (assuming the problem isn't further back than the nozzle where the water comes out). Just tilt the head so it faces down, then use a rubber band to hold a baggie (not too full) with vinegar. Worked for me in another home. Just don't leave it soaking too long.
 
User Profile Image
Ron Garza
Mueller Community

Posts: 72
Joined on January 14th, 2013
Tankless hot water heaters and variable hot water
by Ron Garza on January 31st, 2014

My old WaterPik Shower Massage has been soaking in an old plastic peanut "jar" in 6% Heinz Cleaning Vinegar. Some flakes can be seen floating already. I never did care for the massage feature but the hose helps when cleaning the tub.
 
No Image Available
Christopher Blythe
Mueller Community

Posts: 12
Joined on March 15th, 2011
Tankless hot water heaters and variable hot water
by Christopher Blythe on February 24th, 2014

Just wanted to follow-up... We had the folks from Texas Heaters (http://austintexaswaterheaters.com/) come out to look at our unit. They flushed/descaled the unit and turned the temp down from 120 to 115 degrees. Since then we're back to consistent, reliable hot water.

The technician explained that with the recent cold weather, the water coming into the unit is colder than normal and requires more work to heat. The calcium build-up also causes the unit to heat less efficiently. The combination of the 2 scenarios causes all 6 burners to kick in to heat the water. However, with 6 burners active, the unit gets so hot that it has to periodically shut itself down. Thus explaining the cycling scorching hot to cold water variations we were seeing.

I hope others can benefit from this information.

One moral from this is that the tankless heaters should be flushed and descaled annually to maintain smooth operation. If you're looking for someone to perform the service, I highly recommend Tony at Austin Heaters!
 
Elect Kevin Ludlow for State Rep!
Pro-LGBT Rights, Pro-Pot, Pro-Net Neutrality, Anti-TSA, Anti-NSA. Support Kevin Ludlow for the TX House of Representatives District 46
Weird Window Cleaning
Contact us to receive a free estimate for your window cleaning and experience the same service provided to so many of your Mueller neighbors. Mention this ad for 10% off.
512-944-3700
15 yrs exp. Insured.
Doug Gorton Professional Painting
Interior & Exterior Painting, Fence & Deck Staining, Hand Wash Houses, Screens, & Solar Panels
(512) 799-8384
view more ads »
© 2005 - 2012 cityCore, LLC   |   terms   |   privacy