Totalhome TTHWP Wired 7 Day Programmable Room Thermostat - Replaces Honeywell CM907 CM901

Set a fully independent heating schedule for every day of the week with up to four time-and-temperature periods per day (P1–P4). The wired connection provides a reliable, interference-free signal to the boiler — making this the preferred choice wherever a cable already runs or can be installed without difficulty.

Select AUTO to follow the programmed schedule, MAN to hold a fixed temperature indefinitely, or OFF to switch heating off entirely. In AUTO mode, pressing the temperature buttons applies a temporary override until the next scheduled period. The +1 hour override extends the current period by one hour at the press of a button — no reprogramming required.

The TTHWP features a digital display showing current room temperature, set temperature, current time, and operating mode simultaneously. On-screen icons indicate heat demand, programme period, optimisation status, and battery level — giving the user complete visibility of system status at a glance.

An on-screen alert prompts when the boiler is due for its annual service. This is especially useful for landlords and letting agents who must maintain Gas Safety Certificates, and for homeowners who want a built-in maintenance nudge without relying on a separate reminder system.

The thermostat's non-volatile memory stores the programme and settings indefinitely. Although the display backlight and time-keeping use the AA batteries, the programme itself is retained without power — so a battery change or brief power interruption will not erase the heating schedule.

The TTHWP is a confirmed direct replacement for the Honeywell CM907 and CM901 wired programmable thermostats, using the same two-wire terminal connections. In most cases the new thermostat can be connected to existing wiring without any modifications — making it a quick, low-cost upgrade for an ageing wired thermostat.