Timeguard 24 hour mechanical immersion heater timer timeguard ts900 mechanical immersion heatertimer 24hrs timer mode pin setting type 230v ac voltage rating 13a current rating 0 to 50 c switches on and off at preset times easy to use setting pins 30min minimum switching interval which can be increased in 15min steps manual override until next programme change integral thermal fuse for extra protection 48mm depth for total control of your hot water timeguard ts900 24hr mechanical