Clima Thermostat T5

Most thermostats were designed for a boiler that likes short bursts. The T5 was not: it modulates a heat pump through OpenTherm and a weather forecast, holding a flow temperature low enough to keep the coefficient of performance where it should be. It learns how long your house takes to warm up and starts early rather than hard. The dial still turns, and the display shows the target, the flow temperature and what yesterday cost.