Why does the guest jacuzzi use so much electricity?

A hot tub mainly consumes electricity to continuously maintain its temperature, even when no one is using it, which is typically 3 to 10 kWh per day depending on insulation and outside temperature. Active use adds another 1.5 to 2 kWh per hour on top of that. Over a week of guests, this can already cost tens of euros in electricity that is often not factored into the rental price. A higher fixed rental price does not solve this well, because then every guest pays the same regardless of actual consumption. Visible and separately billed consumption, for example via a metering module, ensures that guests use the hot tub more consciously and that you don't have to make up the difference.