What is the replacement for the UH3 Wiring Centre? November 28, 2018 05:14 Updated Follow The replacement for the Heatmiser UH3 is the UH8 available here. https://www.heatmisershop.co.uk/heatmiser-uh8-8-zone-230v-wiring-centre/ Related articles The output is volt free what does this mean? I have a 12v wired Heatmiser Network System (UH1) Can I upgrade to Neo? Upgrading a UH1-W System to give App control How do radiator zones on the Heatmiser wiring centres enable the boiler? How many actuators can I connect to a zone?