Sangamo PR1n timer (Rishworth HX6)

This is a single channel programmer designed primarily for the timed control of central heating and/or hot water systems, though it won't switch heating loads directly. Ideal for use with a combi boiler. The programmer can be configured for 24 hour, 5/2 day or 7 day operation with up to three on/off timings per day. PR1ns are still available, new, for about £40.