How to order Tankless Water Heater Parts

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Find out what are the main tankless water heaters parts, what do these do, how its quality is related to the heater's performance, efficiency and durability. Majority of the parts here are present in all water heaters that are found in North America, such as Noritz, Rinnai, Paloma, Takagi, AO Smith, Bosch and many other.

It is worth to say that uniquenes of the tankless models lays in concept that all the parts are replaceable, while in tank-type heaters are not.

  • The front panel.

  • The control panel where the control board is located.

  • Gas control valve

  • Combustion chamber and its cover

  • Heat exchanger

  • Electric electrodes

  • Flame rod

  • Outlet and inlet temperature sensors.

  • Water valve

  • Fan

  • Venting system

  • Flow sensor

  • Exhaust sensor

  • Remote controller

The front panel is what covers the inner tankless water heater parts and most of the time is painted in white. Some models, such as Noritz, Rinnai have their models in metalic silver (mainly for commercial models).

Control panel with the electronic board is the brain of the heater; it collects signals, adjust parameters and keeps every operation in order.

Gas control valve is what provides natural or propane gas to the heat exchanger. Once it gets the signal from the electronic board it supplies the heat exchanger with gas where it gets lit. Majority of gas valves today are modulating; increase or decrease the flow based on the water flow, hot water demand or set temperature. 

Indoor models utilize the sealed combustion gas chamber where the heat exchanger and ignition electrodes are located, and it is the place where gas burns. From combustion chamber products of combustion are transfered via exhaust pipes outside.

Most off the conventional tankless water heaters are equipped with one (primary) heat exchanger, made of copper, while condensing units have two, from which secondary heat exchanger is made of stainless steel.

Ignition electrodes generate sparks and ignite the fire while the ionization or flame rod informs the control board that the flame is still present (if not the electronic circuit board turns the unit off).

Venting and exhaust system is used to bring the fresh combustion air in and remove the products of combustion out. These are found as concentirc and twin-pipe system and can be run horizontally through the outside wall or vertically through the roof. At the top of the water heater you will find an intake air and exhaust ducts on which the pipes will be installed.

Water flow sensor protect the unit from low water flow.

Outlet temperature and exhaust sensor make sure that the hot water is not over the limit.

Some tankless water heaters are equipped with the remote controller some are not. It is very neat feater to have, as it controls and monitors the temperature, allows easy troubleshooting by showing the error codes, informs about the history, water flow rate...

LCD or LED display does the same thing as remote control but is located on the unit.

How to order tankless water heater parts

As said above, every component in tankless water heaters can be replaced. This is what you should know when order any of these elements:

  • Model and serial number (check the rating plate).

  • Gas type

  • Part name (heat exchanger, ionization electrode...)

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