New water heater not getting hot enough
Newly installed water heaters often fail to reach desired temperatures because factory anti-scald settings restrict how hot the water can mix. This prevents homeowners from getting adequately hot water at fixtures like showers and leaves them searching for manual adjustments or cartridge fixes.
What the numbers show
Counted from the threads quoted below. How we count
- The most recent one is from October 2026.
- This comes up 16.2× more often in r/Plumbing than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
New water heater not getting hot enough
- 1Turn the gas valve to a higher setting and wait an hourDid this help you?
- 2Adjust the mixing valve by loosening the screw and turning it counterclockwiseDid this help you?
- 3Replacing the low-quality fixture with a better supported brandDid this help you?
- 4Turning down the thermostat settingDid this help you?
- 5Replacing the dip tubeDid this help you?
- 6Turning off the water valve into the water heater for a significant time to let it catch upDid this help you?
- 7flipping the circuit breaker off and onDid this help you?
- 8checking elements with a multimeterDid this help you?
- 9resetting the upper thermostat thermal overloadDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“Hello all! I moved into my first ever house a couple days ago and we still have no hot water.”source ↗
“I turned it on yesterday morning, peeked into the window and saw that it was lit. However all of the water is coming out cold still”source ↗
“(I desperately want to take a shower)”source ↗
“My previous water heater broke and I had a new one installed on Friday. My water has been ice cold since.”source ↗
“A week ago my water started only coming out of the heater lukewarm no matter how high i change the thermostat setting.”source ↗
“Yesterday i replaced the dip tube thinking that would be the problem. It wasn’t.”source ↗
“The burner lights up and the status code shows working normally.”source ↗
“It feels like it’s operating correctly but it’s clearly not”source ↗
“The water throughout the house gets hot, but not as hot as I'm used to.”source ↗
“Hot water at the sink not at the shower. Can the white ring be repositioned to get hot water? I can’t find the manual or any video description of an anti scald. Is the cartridge in wrong? Or just Amazon/China garbage?”source ↗
Where this came up
People with this problem also raised
- 5Why does my boiler water keep going lukewarm?
- 2Dishwasher not getting water after plumbing work
- 3Navien boiler has no hot water and shows T High error
- 2Oven won't heat after self cleaning cycle
- 3Why are my cold taps running tepid after a water heater service?
- 12Why is there no water pressure after changing a faucet?