Baxi Insufficient Heating Output

Water heater ignites but water is only lukewarm even at maximum temperature setting.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Gas valve not fully opening on Baxi gas train, Incorrect gas supply pressure, Partially blocked burner or injectors, Faulty modulation control on PCB

Safety: Gas adjustments must be done by a licensed technician.

User-level checks:

Check tap flow: Excessive flow can reduce outlet temperature. Partially close the tap to reduce flow and see if temperature increases.
Verify temperature setting: Ensure the Baxi control is set to the desired hot water temperature and not limited by an eco mode.

Professional: A gas-safe technician should check inlet and burner pressures, burner condition, and modulation control.

Professional Required 5/5

Gas Valve Assembly

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