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Tankless Water Heater: Issues You May Encounter

Now that we have discussed common problems encountered with a tank-type electric water heater let’s proceed with identifying the common problems homeowners encounter if they have an on-demand water heater.


  • Mineral or sediment build-up. Even if you have a tankless water heater, mineral build-up may still be an issue. When calcium and magnesium from hard water collect inside the heater, it can cause damage to some vital parts. Experts always recommend that whether you have a tank-type or tankless water heater, you need to flush the system at least twice a year. You can also prevent mineral build-up by using a water softener.

  • Overloaded system. If there is a high demand for hot water in your home, the heater may not be able to provide enough hot water. A system overload may damage the unit and lead to costly hot water heater repair. If you are unable to limit simultaneous hot water demand, consider adding point-of-use heaters or upgrading your unit to a higher capacity.

  • Coldwater sandwich. This problem is quite frequent with tankless hot water heaters. But you don’t need to panic right away or call a technician for hot water heater repair. It is usual for the heater to take a few seconds to heat water, especially when there is simultaneous use. The only way to prevent a hot water sandwich is to wait for cold water to pass before jumping in to use the shower.

  • Failed ignition. Several issues may cause a problem with ignition. First, you need to check if there is a power or gas supply. Then, you need to check if the gas valve is open. If none of these resolved the problem, the issue could be more serious. Call a hot water heater repair technician right away to check the unit.


In some instances, it is possible to experience problems with water pressure if you have a tankless water heater. This is often the case if the heater is powered by electricity. Gas-powered tankless water heaters have better water pressure.



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