No C Wire Options
Compare no-C-wire smart thermostats by power method: included adapters and extenders, battery power, and the line-voltage systems to rule out.
Lennox S40 (22V24) Smart Thermostat
Product details
General specs
- Brand: Lennox
- Model: S40 (22V24)
Starting from €946.88
Last price update: 8/18/26
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| Brand | Lennox | Honeywell | Honeywell | Walfront | Honeywell Home | BECA |
| Model | S40 (22V24) | TH6320WF2003 | TH8321WF1001 | X7S | BHT 8000GBLW | |
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| Price | €946.88 | €204.35 | €157.97 | €12.90 | €134.79 | €46.89 |
| Seller | Retailer | Retailer | Retailer | Retailer | Retailer | Banggood |
| Update | May 29, 2026 | Jun 24, 2026 | Jun 24, 2026 | May 20, 2026 | Jun 24, 2026 | May 9, 2026 |
| Connectivity | WiFi, Wi-Fi, Alexa Enabled | Wi-Fi | WiFi | WiFi | WiFi (2.4 or 5.0 GHz), 802.11ax/ac/a/b/g/n wireless router | |
| Compatibility | Heat Pump, Conventional | Stages up to 3 Heat / 2 Cool | Heat Pump with Electric Backup (up to 3 heat/2 cool), Conventional Systems (2 heat/2 cool), Hot Water Heat, Forced Air (gas, oil, or electric) | |||
| Type | Touchscreen Thermostat | Wall Thermostat | Smart Thermostat | WiFi | ||
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