High-Efficiency On-Demand Water Heater Repair​​​

At Moon Mechanical, we specialize in diagnosing and repairing high-efficiency on-demand water heaters — the kind of systems that demand more than just basic plumbing or HVAC know-how. These units are compact, complex, and packed with advanced electronics, sensors, and flow controls that require precision and experience to service correctly.
We go beyond the surface-level fixes. Our team understands the internal logic of these systems — from modulating gas valves and heat exchangers to flow sensors, ignition sequences, and digital control boards. When your unit throws a cryptic error code or fails to deliver consistent hot water, we don’t guess — we troubleshoot with purpose.
Most plumbers and HVAC techs stop at the basics. We dig into the technical guts of the system:
•     Diagnosing combustion issues, sensor failures, and electronic control faults
•     Calibrating flow rates, temperature sensors, and gas pressure settings
•     Replacing or repairing circulators, mixing valves, and modulating burners
•     Resolving venting problems, condensate drainage, and system lockouts
Whether it’s Navien, Rinnai, Noritz, or any other brand, we know how these systems think — and how to get them back online efficiently and safely. If your on-demand water heater isn’t performing like it should, Moon Mechanical is the team that gets it done right.