How a gas boiler works – a simplified summary
The tankless gas water heater operates when you open the hot water tap and the sensor detects the flow. Gas burner is activated and the heat exchanger heats the running water.
If you are looking to install a hot water system then always go for a professional. You may get more information about the best gas hot water installation via https://www.bluehorizonplumbing.com.au/gas-plumbing.
Image Source: Google
Gas tank for boiler heats water and stores it as needed. Hot water is drawn from the top of the tank and replaced with cold water from below due to the fact that hot water rises.
If the water temperature in the tank falls below the set thermostat value, the boiler will run with the burner running until the temperature returns to the set point.
How gas flows through a water heater – How an instant gas geyser works
The gas flow continuously through the hot water tank works when you open the hot water tap and the sensor detects water flow. When the flow passes through the water heater (instantaneous gas geyser), the gas burner is activated and the heat exchanger runs to heat the water.
Some tankless hot water systems (instant gas geysers) use a secondary heat exchanger to preheat the water using heat from the flow through the water heater exhaust gas.
The thermostat regulates the amount of gas that enters the flow through the boiler burner, maintaining a preset water temperature.