Grant Aero3 EP001 Wiring Centre is a clever and convenient solution for multi-zone wiring for a Grant air source heat pump installation. Designed to simplify the wiring connections by housing multiple wiring connections in a single unit. Using the priority switch on the circuit board, this wiring centre is capable of in-built dometic hot water priority and is designed to be fitted on the wall inside a heating plant room or cupboard. Featuring an LED light alongside each heating zone on the circuit board to indicate whether or not a zone is active and centralises the wiring for up to four heating zones and one domestic hot water zone. Grant Aerona3 Wiring Centre