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Measured the gas usage last night with a difference of 0.041m3 with an estimated power output of 10.824kW per JohnTheo5's suggestion - so the boiler is falling within its rated output. Essentially. By the time the boiler turns off after the first burn, the radiators have barely begun to heat up...

The concern I have is that the rate at which it is cycling has suddenly changed over the past week when the heating and water demand hasn’t been adjusted. Previously it was cycling for longer periods of time (20 to 40 minutes etc) rather than the 2 or 3 mins that it’s doing now.

It is indeed a non-condensing boiler. Based on the manual heat output should be 11.72 to 9.09kW. I’ll give measuring the output a go. If it isn’t achieving the correct output, what would be solution to setting it up properly again? A case of varying the setpoint temp and pump flow rate?

Hi all, got a Baxi Solo 2 40 PF boiler that’s acting up. Whenever there’s demand on the boiler, it will fire up, run for 10 or so minutes and then shut off despite the DHW/heating not being up to temp. It will the proceed to cycle between firing up and shutting off every couple of minutes...