Rinnai N Series Replacement Heat Exchanger (1600) (PN-130) The heat exchanger is effectively the core of a Rinnai N1600 series water heater — its job is to transfer energy from the burner to the water passing through it, delivering hot water on demand without sacrificing efficiency or reliability. Its condition directly determines how well the whole appliance performs. This genuine Rinnai heat exchanger, specific to the 1600 model, is made to the original specification, built for reliable heat transfer and long-term durability. Where the existing heat exchanger has worn or is starting to underperform, fitting a genuine replacement restores the appliance's performance and helps prevent further issues developing. ⚠ Important: Installation and servicing must be carried out by a qualified technician familiar with Rinnai produ