Honeywell Home X2P Programmable Thermostat RTH20B (White) vs Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor)
These are side-by-side facts taken from each product guide: published specifications, strengths and caveats as their sources state them. This page is not a test, a ranking or a verdict about which model is better.
Check Honeywell Home X2P Programmable Thermostat RTH20B (White) on AmazonCheck Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor) on Amazon
Honeywell Home X2P Programmable Thermostat RTH20B (White)
Single-stage 1 heat/1 cool systems where Wi-Fi is not needed
A programmable thermostat that runs on two AA batteries, not included. It handles 1 heat/1 cool systems, hot water and forced air, not line voltage baseboards. The guide limits the RTH20B to a 5-2 schedule while Honeywell's spec table lists more options, and the warranty is one year limited.
Published specifications
- Maker: 1 heat/1 cool conventional or heat pump; 750 mV; hot water; forced air
- Maker and guide: powered by 2 AA alkaline batteries (not included)
- Guide: RTH20B schedule 5-2 only, 4 periods a day, or off
- Guide: heat pumps 1 compressor stage; electric backup only where backup is used
- Maker: 3.44 x 5.13 x 1.188 in; UWP wall plate; backlit LCD
- Guide and maker: 1-year limited warranty
Strengths
- Runs on AA batteries, so no C wire is described for this model
- Extended 32°F minimum heat setpoint, per guide and maker page
- Guide and maker page agree on single-stage 1 heat/1 cool compatibility
Caveats
- Schedule conflict: guide says 5-2 only; maker spec table lists 7-day too
- No Wi-Fi or remote control described for this model
- 750 mV claim appears on the maker page but not in the guide pages we read
Read the full Honeywell Home X2P Programmable Thermostat RTH20B (White) guide
Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor)
24 VAC systems up to 2H/2C, or heat pumps with electric backup, where a doorbell view or room sensors appeal
A Wi-Fi thermostat with a 5-inch display, run through the First Alert app, with Matter, a built-in radar sensor, optional room sensors and a view for First Alert VX1 or Ring doorbells. It needs a C wire, with a free adapter voucher in the box, and supports only electric backup heat on heat pumps.
Published specifications
- Manual and listing: up to 3H/2C heat pump (electric backup), 2H/2C conventional
- Maker page table: up to 4H/2C heat pump, 3H/4C conventional (conflict)
- Manual: 24 VAC C wire required; free C-wire adapter voucher in box
- Manual: Wi-Fi 2.4 and 5 GHz; BLE; up to 20 XRSENSOR room sensors
- Manual: 90 x 133 x 24 mm; 5-inch display; heat 40-90°F, cool 50-99°F
- User guide and maker: 2-year limited warranty
Strengths
- Free C-wire adapter voucher included, per the manual and listing
- Doorbell view, radar and room-sensor support documented model by model
- Two-year limited warranty
Caveats
- Maker page stage counts conflict with the manual and listing
- Heat pumps: electric backup only, no gas or oil furnace backup
- Humidity or ventilation control may need extra HVAC equipment
Read the full Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor) guide
How to choose between them
Choose the Honeywell Home X2P Programmable Thermostat RTH20B (White) if your situation matches: Single-stage 1 heat/1 cool systems where Wi-Fi is not needed. Its main caveat: Schedule conflict: guide says 5-2 only; maker spec table lists 7-day too.
Choose the Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor) if your situation matches: 24 VAC systems up to 2H/2C, or heat pumps with electric backup, where a doorbell view or room sensors appeal. Its main caveat: Maker page stage counts conflict with the manual and listing.
Both entries repeat what each guide records. Confirm the model, included parts and availability on the current listing before ordering.
Primary sources
- Honeywell Home X2P Programmable Thermostat product page and specifications (SKU RTH20B/U) Source for Honeywell Home X2P Programmable Thermostat RTH20B (White)
- X2P Programmable Thermostat Installation and User Guide 33-00688ES-01 (listing-supplied PDF) Source for Honeywell Home X2P Programmable Thermostat RTH20B (White)
- Honeywell Home X8S Smart Thermostat product page and specifications (SKU X8VMC8B/U) Source for Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor)
- Resideo X8S & X8Q Smart Thermostats Installation and User Manual 33-00759-01 Source for Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor)
- Resideo X8S Smart Thermostat User Guide 33-00730EF-01 Source for Honeywell Home X8S Smart Thermostat X8VMC8B (Black, no sensor)
Primary sources checked .