The intercooler — more properly the secondary heat exchanger — on a Rinnai 16i series water heater recovers heat from the exhaust gases and feeds it back into the water heating process. It's a key part of what makes these condensing units efficient, capturing energy that would otherwise be lost rather than letting it go straight up the flue.
This genuine Rinnai intercooler is made to the original specification for the 16i series, restoring reliable heat recovery and helping maintain both efficiency and consistent hot water delivery. Whether the unit is simply getting on in years or a specific component has worn out, fitting a genuine replacement intercooler is a meaningful step in keeping the system performing as designed.
⚠ Important: This part should only be installed by a Gas Safe registered engineer. Isolate the gas supply and electrical power before starting work.
Key Features & Benefits
Genuine Rinnai Part: Made specifically for the Rinnai 16i series of water heaters.
Heat Recovery: Captures excess heat from the exhaust and puts it to use, improving overall system efficiency.
Supports Consistent Hot Water Delivery: Helps the system maintain reliable output under demand.
Built for Tankless Water Heater Conditions: Constructed to withstand the operating environment inside the appliance.
Restores Efficiency: A direct fix for a worn or degraded intercooler affecting performance.
Ideal For
Rinnai 16i series water heaters.
Trained water heater engineers.
Servicing, repair, and major overhaul work.
Domestic and commercial installations.
Common Problems This Part Will Fix
Reduced System Efficiency: Restores heat recovery from the exhaust where the intercooler has degraded.
Wasted Energy Through the Flue: Fixes poor secondary heat transfer causing avoidable energy loss.
Inconsistent Hot Water Performance: Addresses output issues linked to reduced heat recovery.
Ageing or Worn Intercooler Component: Replaces a component reaching the end of its working life.
Why Buy This Product?
A worn intercooler quietly costs you efficiency long before it causes an obvious fault, since the exhaust heat it should be recovering just goes to waste instead. Fitting the genuine Rinnai part restores that secondary heat recovery to factory performance, so the system runs as efficiently as it was designed to rather than working harder than it needs to.
Order the Rinnai 16i HEX Intercooler online today.
