Know Which Bosch You Have
Bosch offers a broad tankless lineup in Greater Vancouver, from smaller non-condensing whole-home units to high-efficiency condensing models in the Greentherm range. This matters for leaks, because condensing units drain mildly acidic condensate by design while non-condensing units do not.
If you have a condensing Bosch, water at the base is frequently condensate from a blocked or disconnected drain line — a benign and inexpensive issue. If you have a non-condensing Bosch, water at the base is more likely a genuine leak from a fitting, valve, or internal component. Find the model number first; it instantly tells a technician which category you are in and shapes the diagnosis.
Bosch's compact non-condensing units are sometimes installed in tighter spots — closets, alcoves, and smaller mechanical spaces — where it is easy to mistake a neighbouring pipe or relief-valve discharge for a leak from the heater itself. Before concluding the unit is at fault, confirm the water is actually originating at the heater and not dripping onto it from a connection above. A few minutes of careful tracing here often changes the diagnosis entirely.
Common Bosch Leak Points
Isolation/service valves. Bosch installs usually include flush valves whose bleeder caps and seats wear and weep over time — a frequent, low-cost culprit.
Inlet and outlet connections. Thermal expansion gradually loosens threaded joints; a paper-towel test at the cold inlet and hot outlet locates these.
Condensate line (condensing models). A clogged condensate drain or neutralizer on a Greentherm-style unit backs up and drips from the bottom.
Pressure relief valve. A discharging Bosch PRV typically reflects high incoming water pressure or expansion issues rather than a faulty heater.
Heat exchanger. Scale buildup or freeze damage can crack the exchanger over time, producing a serious bottom-seam leak that usually comes with a fault indication.
Bosch Error Codes and What They Hint At
Bosch tankless units display error codes that help pinpoint the issue. Codes commonly relate to ignition, flame loss, overheating, or flow problems, and an internal water leak reaching sensors or electronics can sometimes trigger ignition or flow faults. An overheat-type code can accompany heavy scale on the heat exchanger, which is also a leak risk over time.
Treat the code as a starting point, not a verdict. Note the exact code shown on the display or remote controller before calling, because it directs the technician to the most likely area and reduces diagnostic time. Combine the code with your own observation of where the water is and how quickly it appears, and you give us everything needed to move fast on the repair.
Bosch Tankless Service in Greater Vancouver
For any Bosch leak beyond a minor weep, power down the unit and close the cold isolation valve to stop water feeding it. Note the model and code. A condensate-related leak on a condensing model is usually a quick, affordable fix; we give an exact quote at 604-359-1081 after seeing it.
Bosch tankless water heaters are serviced by our parent company, CanroHeat, which stocks compatible service valves, gaskets, and condensate parts and holds the gas-fitting credentials these units require. We will pressure-test the connections, verify incoming water pressure, inspect the heat exchanger, and give you an honest read on whether it is a simple fitting or a deeper concern. Many Bosch heat exchangers carry a long warranty, so an internal failure may be partly covered — we will check for you. Call CanroHeat at 604-359-1081 for Bosch tankless leak diagnosis and repair.