Sensors in gas water heaters

Modern gas water heater is a reliable device that can be used without fear for the health of people who are in the same room with the unit. This is due to the presence of a special security system, which includes special sensors that monitor the operation of equipment.

The security system of gas boilers includes the following elements.

This part is also called the combustion sensor. Its main function is to monitor the presence of the flame. While the burner is working, inside the sensor, which is a thermocouple, due to the heat, the pressure increases, which is transmitted to the valve responsible for the fuel supply. If the flame disappears, the temperature decreases, shutting off the gas supply.

Some columns also have an ionization sensor that reacts to flame ions. It is represented by an ionization electrode located just inside the flame, and will activate when the flame disappears unexpectedly, shutting off the burner.

This is located at the top of the unit linking the speaker to the chimney. The main function of this part is to detect sufficient ventilation. If this sensor does not function, the heater will not turn on and will not start heating water, which prevents combustion products from entering the room.

This part is located on the pipes of the heat exchanger to prevent the water from heating above the permissible temperature. If it detects an excessively high temperature of water, the heater will automatically shut down to protect the heat exchanger pipes from damage. Most often such a sensor is designed for temperatures up to +85ºC.

It monitors the opening of the hot water tap - if the tap is closed, the flow sensor will turn off the speaker.

A water pressure sensor prevents the equipment from turning on if the water pressure is too low.

This part will protect the pipes from bursting if the water pressure in the pipes increases.

In the following video of the Heating Service HVAC channel, you can learn even more useful and interesting information about the sensors of gas boilers.

And the following video will tell in detail about what is a draught sensor, what it is needed for and how it is designed.

If the desired sensor in the purchased column is missing, it is possible to install it additionally. Usually such a question concerns the draught sensor, which may not be in some Chinese speakers. Its presence is very important for the safety of using the equipment, so it is best to make sure when buying that the speaker is equipped with this detail.