Climate

Smart Autotune Thermostat

Alexwijn/SAT · v4.2.1

HACSLocal push

The Smart Autotune Thermostat (SAT) is a custom component for Home Assistant that works with many compatible gateways for your boiler.

Documentation Source code

In Apple Home through HomeKit Bridge

What HomeKit Bridge makes of each kind of entity this integration creates, read from its source code. A device only gets the ones that apply to it.

Entity	Shows up as	Note
`switch`	Switch or outlet
`climate`	Thermostat
`binary_sensor`	Sensor (motion, contact, leak, smoke…)
`sensor`	Sensor (temperature, humidity, air quality…)

What people report

SAT drives boilers through OpenTherm gateways (MQTT, serial) or ESPHome; community compatibility list covers many boiler brands, serial reconfiguration is fragile.

Works5
Partly works1
Not working1

Device	In Home Assistant	What they said	Source
De Dietrich MCR3 Evo	Works Local	Listed in boiler compatibility list Saved copy … works with SAT please comment below your Boiler’s Brand and Model. Gas Boilers \| Brand - Model \| ID3:LB \| \| --- \| :---: \| \| Baxi Luna Dua-Tec \| \| \| Dedietrich MCR3 Evo \| 11* \| \| Ferroli BlueHelix Pro \| 9 \| \| Ferroli BlueHelix Tech RRT \| 9 \| \| Geminox \| 4 \| \| Ideal Logic ESP1 \| 6 \| \| Ideal Logic Heat \| 6 \| \| Ideal Vogue Max \| 6 \| \| Immergas Victrix Omnia \| 27 \| \| Immergas Victrix Superior \| 27 \| \| Intergas HRE \| 173 \| \| Intergas Xtreme \| 173 \| \| Itho Daalderop Base Cube \| 29 \| \| Nefit Pro-Line HRC \| 131 \| \| Radiant R2K \| 41 \| \| Remeha Avanta CW5 \| 11* \| \| Remeha Calenta \| 11* \| \| Sime Vera HE … Excerpt saved from GitHub on 2026-10-23.	Discussion #21 · 2023-12
Ferroli BlueHelix Pro	Works Local	Listed in boiler compatibility list Saved copy This is a list of boiler brand / model that provenly works with SAT. If your boiler works with SAT please comment below your Boiler’s Brand and Model. Gas Boilers \| Brand - Model \| ID3:LB \| \| --- \| :---: \| \| Baxi Luna Dua-Tec \| \| \| Dedietrich MCR3 Evo \| 11* \| \| Ferroli BlueHelix Pro \| 9 \| \| Ferroli BlueHelix Tech RRT \| 9 \| \| Geminox \| 4 \| \| Ideal Logic ESP1 \| 6 \| \| Ideal Logic Heat \| 6 \| \| Ideal Vogue Max \| 6 \| \| Immergas Victrix Omnia \| 27 \| \| Immergas Victrix Superior \| 27 \| \| Intergas HRE \| 173 \| \| Intergas Xtreme \| 173 \| \| Itho Daalderop Base Cube \| 29 \| \| Nefit Pro-Line HRC \| 131 \| \| … Excerpt saved from GitHub on 2026-10-23.	Discussion #21 · 2023-12
Intergas HRE and Xtreme boilers	Works Local	Works; ECO RF, Xclusive and Rapid share OpenTherm programming Saved copy This is a list of boiler brand / model that provenly works with SAT. If your boiler works with SAT please comment below your Boiler’s Brand and Model. Gas Boilers \| Brand - Model \| ID3:LB \| \| --- \| :---: \| \| Baxi Luna Dua-Tec \| \| \| Dedietrich MCR3 Evo \| 11* \| \| Ferroli BlueHelix Pro \| 9 \| \| Ferroli BlueHelix Tech RRT \| 9 \| \| Geminox \| 4 \| \| Ideal Logic ESP1 \| 6 \| \| Ideal Logic Heat \| 6 \| \| Ideal Vogue Max \| 6 \| \| Immergas Victrix Omnia \| 27 \| \| Immergas Victrix Superior \| 27 \| \| Intergas HRE \| 173 \| \| Intergas Xtreme \| 173 \| \| Itho Daalderop Base Cube \| 29 \| \| Nefit Pro-Line HRC \| 131 \| \| … Excerpt saved from GitHub on 2026-10-23.	Discussion #21 · 2023-12
Radiant R2K24 boiler	Works Local	Reported working great Saved copy This is a list of boiler brand / model that provenly works with SAT. If your boiler works with SAT please comment below your Boiler’s Brand and Model. Gas Boilers \| Brand - Model \| ID3:LB \| \| --- \| :---: \| \| Baxi Luna Dua-Tec \| \| \| Dedietrich MCR3 Evo \| 11* \| \| Ferroli BlueHelix Pro \| 9 \| \| Ferroli BlueHelix Tech RRT \| 9 \| \| Geminox \| 4 \| \| Ideal Logic ESP1 \| 6 \| \| Ideal Logic Heat \| 6 \| \| Ideal Vogue Max \| 6 \| \| Immergas Victrix Omnia \| 27 \| \| Immergas Victrix Superior \| 27 \| \| Intergas HRE \| 173 \| \| Intergas Xtreme \| 173 \| \| Itho Daalderop Base Cube \| 29 \| \| Nefit Pro-Line HRC \| 131 \| \| … Excerpt saved from GitHub on 2026-10-23.	Discussion #21 · 2023-12
Viessmann Vitodens 100-W	Works Local	Reported working perfectly Saved copy … Duval ThemaFast Condens 25 using the AWB Ebus Opentherm interface 0020092426 \| - \| \| Termet Ecocondens Gold Plus \| - \| \| Vaillant VHR Solide Plus \| 24 \| \| Viessmann Vitodens 100-W \| 33 \| Heat Pumps \| Brand - Model \| ID3:LB \| \| --- \| :---: \| \| Remeha Elga Ace \| 11* \| Dedietrich and Remeha have the same MemberID Code Immergas and Sime have the same MemberID Code This list will be updated Excerpt saved from GitHub on 2026-10-23.	Discussion #21 · 2023-12
Bosch Junkers boilers via EMS-ESP	Partly works Local	Flow temperature erratic from wrong EMS-ESP commands; fix PR closed Saved copy Improve/fix support for Bosch Junkers boilers through EMS-ESP. See https://github.com/Alexwijn/SAT/issues/109 Fixes flow temperature behaving erratically because of wrong commands send to EMS-ESP. Changed commands according to feedback from EMS-ESP developers (https://github.com/emsesp/EMS-ESP32/discussions/2641#discussioncomment-14611481). Changes running reliably with my Bosch Junkers Condens GC7000i for a couple of weeks. # Pull Request Template ## Summary - [ x] I have added a clear, concise title and description. - [ x] The description includes what has changed and why it matters. ## … Excerpt saved from GitHub on 2026-10-23.	PR #154 · 2026-02
OTGW UTP from Nodo Shop (serial)	Not working Local	No MQTT; reconfigure fails over serial and heating stopped on 4.2.0 Saved copy … ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "/config/custom_components/sat/config_flow.py", line 489, in async_step_manufacturer await coordinator.async_will_remove_from_hass() File "/config/custom_components/sat/serial/init.py", line 174, in async_will_remove_from_hass await self._api.disconnect() File "/usr/local/lib/python3.13/site-packages/pyotgw/pyotgw.py", line 64, in disconnect await self.cleanup() File "/usr/local/lib/python3.13/site-packages/pyotgw/pyotgw.py", line 29, in cleanup await self.status.cleanup() File "/usr/local/lib/python3.13/site-packages/pyotgw/status.py", line 102, in … Excerpt saved from GitHub on 2026-10-23.	Issue #137 · 2026-01

Gathered from GitHub issues, pull requests, discussions and docs, and from r/homeassistant. These are individual reports, so check the linked thread and the date before you buy.

How it connects

Local push

Talks to the device on your network, and the device tells Home Assistant the moment something changes.

Found automatically over

DHCP
MQTT

Details

Installs (analytics)	59 (0.01%)
GitHub stars	256
Latest version	4.2.1 (2026-03-18)
Set up in the UI	Yes
Maintainers	@Alexwijn
License	GPL-3.0

Notable forks

Forks with stars, or with code pushed at least 90 days after the original’s last push. Useful when the original goes quiet.

Fork	Stars	Last push	Description
sergeantd83/SAT	★ 6	2026-01-16	The Smart Autotune Thermostat (SAT) is a custom component for Home Assistant that works with an OpenTherm Gateway (OTGW).
jvervoort96-boop/SAT Newer code	★ 1	2026-10-14	The Smart Autotune Thermostat (SAT) is a custom component for Home Assistant that works with many compatible gateways for your boiler.
enricoschroeder/SAT Newer code	★ 0	2026-10-08	The Smart Autotune Thermostat (SAT) is a custom component for Home Assistant that works with many compatible gateways for your boiler.
bellini666/SAT Newer code	★ 0	2026-10-23	The Smart Autotune Thermostat (SAT) is a custom component for Home Assistant that works with many compatible gateways for your boiler.
justink0k/SAT-xtreme Newer code	★ 0	2026-10-23	SAT-xtreme: an unofficial fork of the Smart Autotune Thermostat (SAT) for Home Assistant, with opt-in improvements for calmer, more comfortable and efficient boiler control.

In ReReHome

Whatever HomeKit Bridge shares reaches Apple Home as normal HomeKit accessories behind your Home Assistant bridge, so ReReHome shows and controls them like any other.

Bridges get their own settings page listing the accessories behind them.

Sources

Documentation: https://github.com/Alexwijn/SAT
Source code: https://github.com/Alexwijn/SAT
Issues: https://github.com/Alexwijn/SAT/issues
HACS: https://hacs.xyz