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OK, the system works, and is reasonably cheap to run. But the hysteresis is rather high.
It took some time to work out what the graphs are but 
found it in the end, the green bit (last graph) is outside temperature, green line actually temperature, and black line the set temperature. The first graph is from the Kasa TRV head, and does show the hysteresis, which looks massive, 18.2°C to 25°C, but this is under the window, where we sit it not as much variation.
But the question is with an on/off gas boiler what should be expected.
It took some time to work out what the graphs are but found it in the end, the green bit (last graph) is outside temperature, green line actually temperature, and black line the set temperature. The first graph is from the Kasa TRV head, and does show the hysteresis, which looks massive, 18.2°C to 25°C, but this is under the window, where we sit it not as much variation. But the question is with an on/off gas boiler what should be expected.
