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How to Adjust the Flow Temperature on a Grant Boiler

Grant is mostly oil. Vortex and Grant combi oil boilers set flow on the burner / boiler control, not a gas-combi knob. Typical target is still about 55°C if the house still warms, but follow the oil-boiler manual.

Grant Vortex control panel

Vortex / oil combi

Heating and hot-water switches, a thermostat knob and a pressure gauge.

When the flow is set, go back to the Boiler Optimiser to log what it was and what you set.