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Thermostat compatibility information

Posted: Fri May 29, 2015 5:52 pm
by hvxl
This topic is intended to collect facts about how different thermostats work with the OTGW, to be consulted by people wanting to purchase a thermostat.

Please only post information here. Questions should go to some other topic. I will combine the information in one post per thermostat type.

Honeywell Chronotherm Modulation T8851M1000

Posted: Fri May 29, 2015 5:54 pm
by hvxl
Features:
  • Supports setpoint override to .01 degrees (display rounded to .5 degrees).
  • Supports both temporary and constant setpoint override.
  • Supports clock adjustment (time and day of week only).
  • Supports display of outside temperature provided via opentherm.
The Hometronic icon is displayed when a remote setpoint override is active.

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Remeha iSense

Posted: Fri May 29, 2015 5:56 pm
by hvxl
Features:
  • Supports setpoint override (requires firmware version 19 or higher).
  • Supports both temporary and constant setpoint override, but needs up to 12 minutes to learn which one was requested.
  • Supports clock adjustment only at startup.
  • Supports display of outside temperature.
  • Can take advantage of Smart Power from the gateway.
Remote setpoint override is disabled by default and has to be enabled via the menu. This is only accessible in extended menu mode:
Main menu -> Settings -> Installer -> Remote input -> Allow (Dutch: Hoofdmenu -> Instellingen -> Installateur -> Externe ingang -> Toestaan)


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Remeha Celcia 20

Posted: Fri May 29, 2015 5:58 pm
by hvxl
Features:
  • Supports constant setpoint override only with a resolution of .2 degrees.
  • Supports display of outside temperature.
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Honeywell Round Modulation T87M1003/T87M1011

Posted: Fri May 29, 2015 6:00 pm
by hvxl
Features:
  • Supports constant setpoint override only.
  • The T87M1003 constantly sends DHWenable. The T87M1011 has a button to manually control DHWenable.
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Honeywell Chronotherm Touch Modulation TH8200M1003

Posted: Fri May 29, 2015 6:01 pm
by hvxl
Features:
  • Supports setpoint override, but only with a resolution of 1 degree.
  • Supports display of outside temperature.
  • Does not support clock adjustment
  • Supports ventilation.
  • Supports cooling.
  • Supports display of CO2 value.
  • Supports display of Relative humidity value.
To use the Remote setpoint override, the TELE function must not be enabled.
The Hometronic icon (a "H" with a 'roof') is displayed when a remote setpoint override is active.

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Honeywell Chronotherm Vision Modulation TH8110M1003

Posted: Fri May 29, 2015 6:03 pm
by hvxl
Features:
  • Supports setpoint override, but only with a resolution of 1 degree.
  • Supports display of outside temperature.
  • Does not support clock adjustment.
  • Supports ventilation.
  • Supports cooling.
  • Supports display of CO2 value.
  • Supports display of Relative humidity value.
Remote setpoint override must be enabled via the menu. The TELE function must not be enabled at the same time.
The Hometronic icon (a "H" with a 'roof') is displayed when a remote setpoint override is active.

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Honeywell Wireless CMT957M1011

Posted: Fri May 29, 2015 6:04 pm
by hvxl
The CMT957M1011 is actually a CMS927B(1015) control unit combined with a R8810A1018 OT relay box. (Thanks to D_Hailsham for figuring out and sharing these details.)

Features:
  • Does not support setpoint override
  • Always reports the room temperature as 20 degrees
CMT957M1011.jpg
CMT957M1011.jpg (15.43 KiB) Viewed 3544 times

Honeywell Round Modulation T87M2018

Posted: Wed Feb 01, 2023 11:23 pm
by fanagolo
  • Supports setpoint override. Resolution 0.1°C
  • display has 0.5°C resolution
  • Shows square symbol in top right hand corner of display in override mode (undocumented symbol AFAIK)
  • Provides 5°C minimum temperature setting for 'away' mode or similar
  • Nodo Shop OT gateway works fine, allows scheduling and away detection from HASS
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Intergas touch thermostaat

Posted: Sat Feb 18, 2023 2:06 pm
by Paul H te O
  • Supports setpoint override, by HS4 plugin from Bernold OTGW plugin (Resolution 0.5°C)
  • Nodo Shop OT gateway works fine
comfort-touch-600x311.png
comfort-touch-600x311.png (123.26 KiB) Viewed 3229 times

Re: Honeywell Round Modulation T87M2018

Posted: Sun May 21, 2023 7:34 pm
by old_fart
fanagolo wrote: Wed Feb 01, 2023 11:23 pm
  • Supports setpoint override. Resolution 0.1°C
  • display has 0.5°C resolution
  • Shows square symbol in top right hand corner of display in override mode (undocumented symbol AFAIK)
  • Provides 5°C minimum temperature setting for 'away' mode or similar
  • Nodo Shop OT gateway works fine, allows scheduling and away detection from HASS
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Extra information: If this is connected directly to an older OpenTherm boiler, it might not work (because those don't supply power over the OpenTherm terminals). When connected via the OTGW, it does work.

Re: Thermostat compatibility information

Posted: Mon May 22, 2023 9:44 pm
by hvxl
If with an older Opentherm boiler you mean a boiler that only supports OT/- aka OpenTherm/Lite, then your remark probably applies to most thermostats. I have not encountered a thermostat that does OT/-. But the OTGW also won't work with such a boiler.