Our soon-to-be-ours 2016 Troll has the basic twin water tank system (one under the kitchen sink and one under the bathroom sink) that pumps water to the respective taps only when used. My question is - does this system use microswitch controlled taps? Or pressurised? I assume it's the former, but want to check before planning an upgrade to an external Whale pump in an Aquaroll. My first Eriba (1999 Triton 420) had the same twin small tank system, however I can't remember its details after all these years...