A gas water heater uses gas combustion to heat water instantly. Understanding the flow of water, gas, and exhaust is essential for installation, maintenance, and troubleshooting.
Operating Sequence
Cold Water Inlet
Cold water enters the water heater through the inlet connection.
Water Flow Sensor
When a tap or shower is opened, the water flow sensor detects the flow and signals the heater to start.
Gas Valve and Burner
The gas valve regulates the gas supply. The burner ignites the gas and produces heat.
Heat Exchanger
Water flows through the heat exchanger, where it absorbs heat from the burner. The water and combustion gases remain separated.
Hot Water Outlet
The heated water leaves the unit and is delivered to the tap or shower.
Exhaust Flue
Combustion gases are safely directed through the flue and discharged outside.
Water Flow
🔵 Cold Water Inlet → Water Flow Sensor → Heat Exchanger → Hot Water Outlet
Gas and Combustion Flow
🔴 Gas Inlet → Gas Valve → Burner → Heat Exchanger → Exhaust Flue
