Frequently Asked Questions
Can a tankless water heater actually run out of hot water?
It doesn’t run out in the same way a storage tank does because it heats water as needed. However, a tankless heater has a maximum heating capacity. If simultaneous demand exceeds what the unit can handle, the delivered water temperature may drop. Proper sizing considers both required flow and temperature rise.
How often does a tankless water heater need maintenance?
Our service information recommends annual flushing and inspections to help prevent mineral buildup and support the life of the unit. Actual maintenance needs can also depend on water quality and manufacturer requirements.
Can hard water cause tankless water heater problems?
Hard water contains minerals that can contribute to scale buildup. Tankless heater manufacturers recommend periodic flushing because accumulated scale and lime can affect equipment performance and longevity. Homes with recurring mineral problems may also benefit from evaluating their water quality.
Why does my tankless water heater get cold when two showers are running?
The combined hot water demand may exceed the heater’s available capacity. Tankless systems must be sized according to simultaneous flow requirements and the temperature increase required to heat incoming water. If reducing simultaneous use solves the problem, system capacity may be worth evaluating.
Should I repair or replace a tankless water heater with inconsistent hot water?
That depends on the cause of the problem, the condition and age of the equipment, and how frequently repairs are needed. Warm Welcome’s guidance notes that an older system with frequent repairs, recurring error codes, or difficulty providing consistent hot water may warrant evaluating replacement. A professional inspection can help determine the appropriate next step.
