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Started By
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tankless water heater
Posted on 10/10/25 at 11:31 am
Posted on 10/10/25 at 11:31 am
1 year old tankless. last about 10 minutes then starts to get cold in my shower only. wife and kids shower and tub stays hot forever. any suggestions?
5
Posted on 10/10/25 at 1:03 pm to bluewing
On a well by chance? I had this issue, I bet if you turn on your shower and turn on the hot in a sink it will stay hot. We had to up our pressure to increase the flow in one specific bathroom.
Posted on 10/10/25 at 3:59 pm to bluewing
quote:i mean you might start by listing the brand, energy source, etc.
1 year old tankless. last about 10 minutes then starts to get cold in my shower only. wife and kids shower and tub stays hot forever. any suggestions?
i had one at my last house that was an absolute beast and loved loved LOVED it. the recirculator 'learned' our behavior so the water was hot and ready no matter which shower you got into in the morning.
naveen ftw
Posted on 10/10/25 at 6:53 pm to bluewing
Take off the shower head and clean it - the flow may be just low enough currently that it doesn’t trigger the heater to stay on after a while - happened to me
Posted on 10/11/25 at 11:09 am to bamaswallows
Most of them throw a code when something is going wrong with it. Check on the thermostat and see if there is a blinking code. Also, they should be flushed once a year.
Posted on 10/14/25 at 12:39 pm to bamaswallows
quote:
Take off the shower head and clean it - the flow may be just low enough currently that it doesn’t trigger the heater to stay on after a while - happened to me
Or if head is one of those awful low flow you can break off the piece of plastic inside to give you the full pressure. Youtube has videos about specific brands of heads.
Posted on 10/15/25 at 6:25 pm to bluewing
If it’s a navian it sounds like the check valve. Cost about $5 and takes 5 mins to change. You should probably descale it while you have the gas electric and water off.
This post was edited on 10/15/25 at 6:27 pm
Posted on 10/16/25 at 8:07 am to bluewing
Do the other showers and tub have higher flow rates? If the water isn't coming out fast enough, the water heater can overheat and have to shutdown.
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