★★★★★Joe Esseenv2.108 Apr 2024
Love that it's a one off payment and not a subscription. One of the negative reviews is based on a misconception. The flow and return temperature does not affect the heat loss from a room. What it affects is the size of the radiator and the difference between the two affects your flow rate required and therefore pipe sizes. Lower diff - higher flow rate (and bigger pipes). Lower flow temp - bigger radiator needed. The heat loss is the same; use a correction factor from the manufacturer.