Rinnai Leaks: Start With the Obvious
Rinnai is one of the longest-standing tankless brands, and many Greater Vancouver homes run Rinnai non-condensing and condensing models. The first step with any Rinnai leak is the same: figure out whether you are looking at condensate or pressurized water.
Non-condensing Rinnai units do not produce significant condensate, so water at the base of those models is more likely a true leak from a fitting or internal component. Condensing Rinnai units (the higher-efficiency RU and RUR series, for example) do drain condensate, so the harmless explanation is back on the table. Identify which type you have — the model number tells the technician immediately — then trace the water to its source.
A quick way to start: dry the unit and the floor completely, then run a hot tap for five minutes and watch. Fresh moisture that reappears at a specific fitting points you to a connection; water that emerges only from a drain tube points to condensate; water seeping from the bottom seam of the cabinet itself is the one that warrants urgent attention. This two-minute observation saves diagnostic time and tells you how quickly you need to act.
The Usual Rinnai Culprits
Isolation/service valves. Rinnai installs almost always include a service-valve kit for flushing. The bleeder caps and valve stems are common weep points as seals age.
Inlet and outlet fittings. Years of heating and cooling loosen threaded joints slightly. A dab test at the cold inlet and hot outlet usually reveals these.
Pressure relief valve discharge. A Rinnai PRV releasing water typically signals high household pressure or expansion issues rather than a faulty unit.
Condensate line (condensing models). A blocked condensate drain on a condensing Rinnai will back up and drip from the bottom.
Heat exchanger. Scale buildup over many years, or freeze damage, can crack the exchanger and produce a serious bottom-seam leak — the one that warrants urgent attention.
Rinnai Codes and Scale: The Hard-Water Connection
Rinnai units display diagnostic codes on the controller. Code 10 relates to air supply or exhaust, code 11 to ignition failure, and code 12 to flame failure — and water intrusion onto components can sometimes trigger ignition or flame faults. A code in the LC family on many Rinnai models specifically flags scale buildup and the need for descaling.
That scale warning matters for leaks. Even with Greater Vancouver's softer water, a Rinnai that has gone many years without a flush can accumulate enough scale to stress the heat exchanger and reduce flow. Catching an LC-type code early and descaling can prevent the kind of exchanger damage that eventually leaks. Always note the exact code displayed before you call — it directs the technician straight to the likely cause.
Rinnai Service in the Lower Mainland
If your Rinnai is leaking, power it down at the switch and close the cold isolation valve for anything more than a slow weep. Record the model number and any controller code. A condensate-line leak on a condensing model is usually a quick, low-cost fix; we provide an exact quote at 604-359-1081 once we see the unit.
Rinnai tankless water heaters are serviced by our parent company, CanroHeat, which carries Rinnai service-valve components, gaskets, and the descaling equipment these units need. We will pressure-test the connections, check incoming water pressure, inspect the heat exchanger, and confirm whether you are dealing with a simple fitting or something deeper. Many Rinnai heat exchangers carry a long warranty, so an internal failure may be partly covered — we will verify that. Call CanroHeat at 604-359-1081 for Rinnai tankless leak diagnosis across Greater Vancouver.