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I have had a look at SONOFF products and thought about a scheme which senses the current drawn by the shower to turn off the ground floor UFH via the home automation network. I do not like it because it relies on wifi connectivity and a fast response by the hat network and logic. I envisage a short period because of data transmission delays when both the shower and the ground floor ufh could/would be on and exceeding the capacity of your circuit breakers and cabling albeit only briefly perhaps but I think maybe long enough for breakers to trip. And forgive me for saying this but we ie you would have to build it which I am not easy with. It is not tried and tested.
The tried and tested way is a shower priority unit made by a reputable company like GARO for many years and giving reliable safe service in the UK and I assume elsewhere too. The device would switch between the shower and the UFH on the same floor as the shower via the C40. Thus it would be easy to install because all the connections are at the upper board's location.
Could you take a look at this example and if you read to the end you will see that one version of the priority board has a timer function which may be useful to you to stop overly long showers.
https://www.garo.co.uk/docs/2020/info/shower boards info sheet.pdf
The tried and tested way is a shower priority unit made by a reputable company like GARO for many years and giving reliable safe service in the UK and I assume elsewhere too. The device would switch between the shower and the UFH on the same floor as the shower via the C40. Thus it would be easy to install because all the connections are at the upper board's location.
Could you take a look at this example and if you read to the end you will see that one version of the priority board has a timer function which may be useful to you to stop overly long showers.
https://www.garo.co.uk/docs/2020/info/shower boards info sheet.pdf