Time for an overview of the 'tinkering time' project, codename "Ecolux". This is a domestic/commercial heating controller prototype, and I'm looking to build exactly one unit and give it my father as a gift. The Ecolux is a 3-8 zone system, using a remote digital thermostat in each zone. There will be a bank of electrically operated 2-port vales near the boiler to direct heat to each zone. The plumbing is laid star rather than bus, so at the boiler are a flow/return pair for each switched zone. The radiators are a mixture of standard convection panels (sized per building reg.s) and one or two forced (fan-assisted) under-unit devices. There is wall mounted unit at the boiler which houses the microprocessor and valve drivers, and another small pannel housing LCD screen and joystick, hopefully to be mounted on a double-size UK domestic socket.