The H3747 also includes many of the latest Boiler Plus energy-saving features such as optimum start and stop per heating zone, as well as on-off load compensation. 12-year battery life warranty on programmable thermostat display (PTD).
Horstmann/Secure H3747 4 Channel Wireless Smart WiFi App Phone Programmable Room Thermostat (Replaces H37XL & H47XL) - Hanicks
Secure Meters Horstmann H3747 4 Channel Programmable Room Thermostat Direct Replacement for H37XL and H47XL Bluetooth Programming with Smart WIFI Add-On Option App Controlled
Secure H3747 Smart 4 Channel Programmable Stat ~ Replaces Horstmann H37XL H47XL
Secure H3747 Smart 4-Channel Receiver Programmable Thermostat With WiFi Card
Secure HC2.4 Wifi Extender Plug In Adaptor Card for C1727 H3747 E7+
Secure HC2.4 WiFi Extender
