This is an upgraded timer that allows you to set a different programme with up to 16 on/off times for each day of the week.

Your existing timer may have either 4 or 5 terminals. If it has 5 that is because it is a general purpose timer made to control air-conditioning and all sorts of other devices. You will note that there are only 4 wires connecting to your timer and the fifth terminal is not used. 

Our timers are specifically made for boilers without the redundant fifth terminal thus eliminating the confusion of how to connect 4 wires to 5 terminals.

Supplied with full instructions and clear anti-tamper cover.

PLEASE NOTE THAT THIS IS A SUPERIOR MODEL WITH A BUILT-IN RECHARGEABLE BATTERY UNLIKE OTHERS THAT HAVE A SINGLE-USE LITHIUM BATTERY THAT HAS TO BE REPLACED WHEN FLAT.

This timer fits Ravenheat RSF 82E 82ET 84E 84ET 100E 100ET