MCO Home
MH-5900 (Z-Wave 800) Thermostat
MH-5900 (Z-Wave 800) Thermostat
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MH-5900-US Z-Wave 800 Series Thermostat
Professional-grade, U.S.-spec Z-Wave 800 thermostat for conventional and heat-pump HVAC systems — up to 3 Heat / 2 Cool with O/B changeover, emergency heat, and secure S2 Z-Wave control.
- U.S. model — 908.4 MHz Z-Wave frequency
- Compatible with North American Z-Wave hubs (Home Assistant, Hubitat, HomeSeer, etc.)
- Supports 24 VAC systems with C-wire (recommended) or optional AAA batteries
- Touch-button interface and clean frameless design
Why it’s ideal for North American smart homes
U.S. Z-Wave 800 platform
Factory-configured for the 908.4 MHz North American band. Works natively with U.S. Z-Wave hubs — no region setup or firmware change required.
Wide HVAC compatibility
Handles up to 3-stage heat / 2-stage cool, with O/B reversing valve and AUX/EM-Heat — covering most U.S. conventional and heat-pump systems.
Fast, clean installs
Standard 24 VAC wiring with labeled terminals and compact 113 × 113 × 19 mm body for a professional fit on U.S. wall boxes.
Secure and future-proof
Z-Wave 800 chipset with S2 encryption, fast mesh routing, and OTA firmware upgrade capability.
Key features
- HVAC control: Up to 3 Heat / 2 Cool, conventional or heat-pump with O/B changeover and AUX/EM-Heat.
- U.S.-only Z-Wave 800: 908.4 MHz radio with S2 security — certified for North American operation.
- Power: 24 VAC with C-wire (recommended) or 4 × AAA batteries for backup or limited low-power use.
- Modes: Heat, Cool, Auto, EM-Heat, Fan On/Auto, configurable schedules.
- Display: Frameless glass-style front with backlit capacitive buttons.
- Smart integrations: Works with Home Assistant (Z-Wave JS), Hubitat, HomeSeer, and other U.S.-spec Z-Wave hubs.
Technical specifications
| Model | MH-5900-US (Z-Wave 800, U.S. version) |
| Z-Wave frequency | 908.4 MHz (U.S. only, certified for North America) |
| HVAC compatibility | 3H/2C conventional or heat-pump with O/B changeover & AUX/EM-Heat |
| Power | 24 VAC ±10% (C-wire recommended) or 4 × AAA battery (low-power mode) |
| Setpoint range | 32 – 99 °F (0 – 40 °C) • 1 °F / 0.1 °C resolution |
| Accuracy | ± 0.1 °C |
| Terminals | C, R, RC, W1, W2, G, Y1, Y2, O/B, K, EF (reserved) |
| Dimensions | 113 × 113 × 19 mm (approx. 4.45″ × 4.45″ × 0.75″) |
| Mounting hole spacing | 60.3 mm (2.38″ center-to-center) |
| Self-consumption | < 1 W |
| Housing | PC + ABS |
U.S. version only — factory-tuned to 908.4 MHz Z-Wave band. Not compatible with EU/AU/NZ hubs. Specifications may change without notice.
Installation tips
- Power: Use 24 VAC C-wire whenever available. If unavailable, use a wire-saver kit at the air handler or battery mode (limited).
- System setup: Select Conventional or Heat Pump and O/B orientation during initial configuration.
- Inclusion: Add to your Z-Wave hub in S2 mode for secure pairing (908.4 MHz U.S. frequency).
- Protection: Adjust compressor delay and EM-Heat settings to match your equipment specs.
FAQs
Which hubs does it work with?
Can I use this outside the U.S.?
Is it compatible with Home Assistant?
For indoor use in the United States only (908.4 MHz Z-Wave). Installation should be performed per local electrical codes. Product specifications and firmware subject to change by the manufacturer.
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