Like seriously?
In: 1
Because for most of us we either have the vague hot and cold scale or the dual valves for hot and cold.
The first one is not only small making micro adjustments hard but has no readings to give actual °C levels.
The second one is dumb and makes you play alchemy with the two taps to find your ideal water.
The main reason I could see this being so unreliable is that unless it’s super new water heaters can’t do precision as well as we want our showers to work at.
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