Electric underfloor heating for a 6m² bathroom and counter battens

We have infrared heaters in the rehearsal room at the music school. They are very pleasant and thermostat-controlled. In practice, they do not cool down completely there. The distance to the opposite wall must not become too large, otherwise the units are no longer very effective. Right in front of them, they are quite warm. In our new house, a masonry heater and infrared heaters will be used; the boys' apartments will get infrared heaters and each a Swedish stove (which they do not have to use for it to get warm). We do not have these yet.