ST100ZB – LINE VOLT THERMOSTAT

Upgrading or replacing your thermostat is one of the simplest HVAC fixes — no tools beyond a screwdriver. The Salus ST100ZB controls line voltage heating systems (like baseboard heaters and radiant heat) and adds smart control via Zigbee wireless connectivity — adjust from your phone.

Specs: Line voltage (120/240V), Zigbee wireless, compatible with baseboard, radiant, and convection heaters

Replaces: ST100ZB

Fits: Line voltage heating systems — baseboard heaters, radiant heaters, convection heaters, fan-forced heaters

Need help? See our Thermostat Not Working Guide.

In stock at Open To Public HVAC Parts in Dallas. We test parts at the counter before you buy. Call or text (214) 340-9421.

Specs

• TypeThermostat
• Check before buyingSystem type and whether you have a C wire

Will this thermostat work with my system?

Match the system type first - conventional gas/electric, heat pump with auxiliary heat, or multi-stage. A stat wired for a conventional furnace will not run a heat pump's reversing valve correctly, and that is the mistake that costs people a comfortable winter.

Do I need a C wire?

Most digital and all smart thermostats do - the C (common) wire is what powers the stat continuously. Mechanical and battery-powered stats do not. If you have no C wire at the stat, your options are running one, using an adaptor at the air handler, or choosing a battery stat.

What do the letters mean?

R is power, W is heat, Y is cooling, G is the fan, C is common. On a heat pump, O or B runs the reversing valve and there is usually an auxiliary or emergency heat terminal. Photograph the old wiring before you pull a single wire.

Why would I want a locking cover?

Rentals, offices, churches, waiting rooms - anywhere the setpoint gets moved by whoever walks past. A clear cover lets people read it without changing it; a solid metal one hides it entirely.

Is a mechanical thermostat still a reasonable choice?

For a simple system with no scheduling needs, yes. No batteries, nothing to fail in software, and nothing to get confused about. They run a wider temperature swing than a digital stat, which some people prefer and some do not.

Can you help me pick one?

Bring a photo of your current wiring and the furnace or air handler model to 10226 Plano Rd, Suite 104 in Dallas.