Tankless water heater installation and repair is one of our top plumbing services in Modesto, Ca including Riverbank, Oakdale and all other parts of Stanislaus County. Since tankless water heaters are pretty complex with many parts most repairs should be left to a professional, but there are some problems that can be solved by the average homeowner. Below I’ll write about one of the most common problems with a tankless water heater that could be solved by a homeowner, but remember if you smell gas, hear funny noises or have a tankless water heater error code immediately turn of the water heater, turn off gas if possible and give a professional a call (209)352-4294.
A pretty common problem with tankless water heaters that we hear from our customers around Modesto, Ca is that the tankless water heater will either not turn on, or will turn on and then turn off. We have found that many times this is caused by a lack of flow through the water heater. A tankless water heater knows when to turn on when a flow sensor senses a flow of water through the tankless water heater. Most until have a minimum flow rate that will turn them on. If the water flow is below this amount the tankless water heater can turn on and then turn off, or never turn on at all. This can be caused from turning the temperature up too high. What happens is the higher temperature water is used to mix with cold water to make water that is suitable for a shower, hand washing, or bathing, and it takes less 140 degree water than 120 degree water to mix with cold water to make a comfortable temperature water. This causes less water to move through the water heater because more heat is being stored in the 140 degree water, and sometimes causes the unit not sensing flow. This problem can often show up in the summer because incoming cold water is usually warmer and requires even less hot water when mixing to get it up to the desired temperature.
The problem can be solved by adjusting the temperature down from it’s higher set point. Most tankless water heaters installed in Modesto, Ca have a high enough flow rate to turn on when set at 120 degrees. Many tankless water heaters like the Navien NPE series have a controller on the front that can be re-set by pushing the down button. Other tankless water heaters need a part on the panel inside switched out to set it at the lower temperature. If you need help troubleshooting your tankless water heater or making a repair give us a call at (209)352-4294