Residential Plumbing & HVAC Experts

Your Tankless Water Heater Doesn’t Heat as Fast — What’s Going On?

Tankless water heaters are very reliable, but on rare occasions, there may be a problem that needs to be investigated and repaired. Temperature fluctuation is the most common complaint. There are electrical, gas, and water connections involved with a tankless heater and special tools may be required. In most cases a professional should handle this type of repair.

Problems With Tankless Water Heaters

  • Check setting – The temperature setting may have been changed be mistake
  • Worn seal – If the seal is worn on the crossover water supply, there may be insufficient hot water. You can check this by shutting off the cold water supply to the heater and opening a hot water faucet. The water should stop flowing after a short while. If the water flow continues, the seal is worn.
  • Failed sensor or computer board –  The tankless water heater uses a sensor to monitor flow of water and change firing rate to supply enough hot water. A sensor that is not working correctly may fail to add the required amount of hot water.
  • Water leaks – It is possible that the problem is not in the unit itself. A water leak in your plumbing may be causing hot water to be lost in transit to the appliances.

Even though tankless water heaters are said to produce instant hot water, it does take a few seconds to heat the water to the desired temperature. The water must then travel through the pipes to reach your faucet. Some modern appliances today have a low flow feature which can add even more time for the water to become hot. Taking a few minutes to reach the desired temperature is not uncommon.

However, if you suspect a problem with the heater equipment, a professional should diagnose the problem. Depending on whether you have an electric, gas, or propane heater, a technician will perform the necessary tests to check your heater.

Please contact Sherlock Heating & Air with any concerns regarding a tankless water heater or other home comfort issues. We are proudly serving all of San Diego county and southern Riverside county.