Whittier, CA · Tankless water heaters
A tankless unit flashing an error code, hot water that turns cold mid-shower, or thinking about switching from a tank? Scale inside the heat exchanger builds with every gallon you heat, and an overheating exchanger can shut your unit down again and again. Call to get connected with a local plumbing contractor for tankless water heater repair, installation or maintenance.
How tankless works
The unit heats water as it flows through, so there's no stored tank to run out.
What do you need?
Most tankless calls come down to one of two situations: your existing unit isn't working right, or you're deciding whether to put one in.
Either way, start with a call. A unit that keeps shutting down can leave you without hot water at any point, and the cause usually keeps getting worse.
Call (562) 273-9788Tankless repair
Tankless units fail differently from tanks. These are the problems you're most likely to see.
Your unit stops heating and displays a code. Codes point to problems such as ignition, venting, flow or overheating, and a code that keeps returning means the fault is still there.
Temperature that swings during use, often from low flow, scale buildup or a sensor issue.
Running a shower and a dishwasher together may exceed what your unit can heat, especially if it's undersized.
Minerals in the water coat the heat exchanger over time, cutting efficiency and flow. Left in place, scale traps heat and can trip the overheat shutoff. Descaling clears it.
On gas units, often gas supply, ignition or venting. On electric units, often an element or power supply.
Water around your unit or new noises can point to a failing part or connection.
Is tankless right for you?
Tankless has real advantages, but it isn't the right answer for every household or every house.
Tankless often suits homes that
A tank may still make more sense when
Weighing the switch?
Your current water heater and your household's hot water use decide which type fits. Talk through both options now, while you still have time to compare them.
Discuss switching to tanklessComparing tank and tankless side by side? Tank vs. tankless water heaters
Tankless installation
Replacing your tank with a tankless unit is more than a swap. These things usually decide how involved the installation is.
Keeping a tank instead? Water heater repair and replacement
Questions
Quick answers on tankless repair, installation and upkeep. If your question isn't here, call and ask.
Tankless unit shutting off? You don't need to know the cause first. Repeat shutdowns usually mean scale or a fault that keeps getting worse.
Call (562) 273-9788Common causes include flow too low to keep your unit on, scale buildup, a clogged inlet filter, or too many fixtures running at once for the unit's size.
Codes differ by manufacturer, but they generally point to a category of problem such as ignition, venting, flow or overheating. A code that keeps returning means the cause is still there, and an overheating code often points to scale or restricted flow.
It depends on your water and how much you use the unit. Harder water builds scale faster, so your unit needs descaling more often. Manufacturers give their own recommendations.
Yes, if its size matches your household's peak use: how many fixtures run at the same time. An undersized unit is a common reason tankless systems can't keep up.
It depends on your household and your house. Tankless saves space and doesn't run out the way a tank can, but switching can require gas line, venting or electrical changes. Talk through both options before you decide.
Reviewed September 2026
A unit that keeps shutting down only builds more scale and heat stress. Call about repair, or about the switch you're considering.