Tankless water heaters are popular among Bellevue homeowners because they provide endless hot water, take up less space, and are more energy-efficient than traditional water heaters. But even the best systems can experience issues over time. Knowing the most common problems—and when to call for tankless water heater repair—can help you avoid bigger headaches and costly replacements.
A tankless water heater can last 15–20 years if properly maintained. However, ignoring minor issues can shorten its lifespan, raise your utility bills, and cause unexpected breakdowns. Regular maintenance and timely repairs are essential to keep your system running efficiently.
Bellevue water can contain minerals like calcium and magnesium that cause limescale buildup inside the heat exchanger. This reduces efficiency and can lead to overheating.
Solution: Schedule annual flushing to remove mineral deposits and protect the system.
Water turning hot and cold during use is frustrating. This may be caused by a clogged filter, a faulty temperature sensor, or low water pressure.
Solution: Have a technician inspect and clean filters, test sensors, and check water pressure.
Gas-powered tankless systems may fail to ignite due to dirty burners, faulty igniters, or gas supply issues.
Solution: A licensed plumber can clean the burners, adjust the gas pressure, and replace defective parts.
Modern tankless units have built-in diagnostics. Error codes could indicate overheating, vent blockages, or component malfunctions.
Solution: Contact a repair professional to interpret the code and fix the root cause.
Clogged inlet filters or limescale inside the pipes can reduce water flow.
Solution: Cleaning filters and flushing the system restores proper water pressure.
Putting off tankless water heater repair can:
Quick action saves money, reduces downtime, and helps maintain consistent hot water.
These small steps can prevent bigger problems down the line.
DIY fixes can help with basic cleaning, but repairs involving gas, electrical parts, or internal components should always be done by a licensed plumber. Professionals ensure your unit is repaired safely and according to manufacturer standards.
About Green House Plumbing
Green House Plumbing is Bellevue's trusted family-owned plumbing contractor providing licensed service for homes & businesses. With over 25+ years of experience, our technicians offer drain cleaning, sump pump repair, tankless water heater repair, tank/tankless water heater service, furnace/HVAC maintenance, pipe leak repair, sewer line replacement, burst pipe repair, clogged drain hydro jetting, toilet repair/replacement & more. Whether you need minor drain cleaning or major sewer line replacement, we have the expertise to fix any plumbing issue quickly and affordably—24/7. Our plumbing technicians in Bellevue provide services to homes & businesses with quality workmanship. Call Green House Plumbing for superior plumbing & heating services you can trust.