Tested - fully functioning clock and 4 zones (1 water and 3 heating). See photo. Advance and boost functions work no probs and leds all work.
Horstmann ChannelPlus H47XL UHF 4 Channel 7 Day Central Heating Programmer White
Secure H3747 Smart 4 Channel Programmable Stat ~ Replaces Horstmann H37XL H47XL
Horstmann ChannelPlus H27XL Series 2 2-Channel 7 Day Electronic Programmer
Horstmann ChannelPlus H27XL Series 2 2 Channel 7 Day Electronic Programmer
Horstmann ChannelPlus H27XL Series 2 - 2 Channel 7 Day Electronic Programmer
Horstmann/Secure H3747 4 Channel Wireless Smart WiFi App Phone Programmable Room Thermostat (Replaces H37XL & H47XL) - Hanicks
