HestiaPi Touch

by MakeOpenStuff

An open source, smart thermostat for controlling HVAC and water systems

$21,831 raised

of $6,000 goal

363% Funded! Order Below

Product Choices


HestiaPi DIY Kit

Do it yourself: no case, no Pi, no SD card, soldering required.


Recent Updates

As Featured In



"all the home automation advantages of something like Google’s Nest “smart” thermostat without running the risk of your data being sold to the highest bidder. "

(ch)own your smart home thermostat - if you don’t have root access, someone else does.

HestiaPi Touch is a completely open source smart thermostat for your home. With it, you can monitor your home’s temperature, relative humidity, and atmospheric pressure. You can also control your heating, ventilation, air conditioning, hot water, and more from anywhere you have an Internet connection. You can do all this securely and with confidence your private data stays private. HestiaPi Touch is compatible with many devices and home automation systems and can serve as a central point of control that ties them all together in your home.

Board Diagram
1. Modular PSU6. Reset pin
2. MicroUSB (power + data)7. 4x Relays
3. MicroSD card8. Sensor connector
4. Raspberry Pi9. Reset button
5. LCD Connector + GPIO10. Terminals

Features & Specifications

  • Integrated Raspberry Pi Zero W*
    • Processor: Broadcom BCM2835 single-core CPU running @ 1 GHz
    • Memory: 512 MB RAM
    • Storage: includes 16 GB microSD card with latest software
  • Wireless Connectivity
    • 802.11 b/g/n wireless LAN
    • Bluetooth 4.1 Low Energy (BLE)
  • Touch Display
    • 3.5" LCD resistive, single-point touch screen
    • Snaps onto Raspberry Pi GPIO header
  • Temperature, Humidity, Pressure Sensing
    • Integrated Bosch BME280 I²C
      • Temperature: -40-80°C, ±0.5°C
      • Relative humidity: 0-100%, ±3%
      • Atmospheric pressure: 300-1100 hPa, ±1.0 hPa
  • Solid State Electrical Relays
    • Four relays with normally open contacts
    • Relays are for AC loads only (as standard for all HVAC systems), no DC loads
    • Each relay rated for 2 A, 110-250 V AC
  • Power
    • Connects to mains power or common (C) wire
    • Consumes less than 3 W (< $5 per year)
  • Open Source Software
    • Pre-installed with openHAB 2
    • Mobile apps for Android, iOS, and Windows
    • Fully MQTT compatible
    • Can work with Google Home and Amazon Alexa
  • Enclosure
    • 3D-printed
    • Choice of colors
  • Dimensions
    • 12 cm x 13.5 cm x 3.8 cm
    • 200 grams (EU), 225 grams (US)
  • Compatibility
    • Supports most US systems with five wires: C, R, W, Y, G (Common, Red, White, Yellow, Green)
    • Supports most 100-220 V AC mains-powered EU systems
    • Fahrenheit (°F) and Celsius (°C) supported

*: Bottom side of PCB - mini HDMI, USB for power and camera connectors are physically blocked.

Terminal Block Wiring

C(N)C - Common wireNeutral
R(L)R - RedLive
W(W)W - WhiteHot water
Y(H)Y - YellowHeating
G(Hum)G - GreenHumidity
W2Two-stage furnaceTwo-stage furnace

US vs. EU: Which option is right for me?

HestiaPi Touch is available in two options: US or EU. These determine the power supply input voltage (US: 24V AC, EU: 100-240V AC). The US option supports the C (common) wire in HVAC systems. Even if you live in the US, you may live in a house that does not support the C-wire, so make sure to check which is the right option for you.

US-HVAC Model Hookup (24V AC)

EU Model Hookup (100-240V AC)

No Need to Trade Privacy for Convenience

Our homes are becoming ever more enhanced with complex technologies. With proper automation and coordination of these technologies, our lives will become easier and more comfortable. Coming home after work to find a warm home with hot water ready to use is convenient. However, the very automation that affords us these conveniences also strips us of our privacy by constantly harvesting data about us and shipping it off to companies for marketing and other purposes.

We wanted a home automation solution that preserves our privacy and security, has all the features we need, and is available at a reasonable price. So, we did what engineers do in these situations: we spent time and brain cells to design and develop (and redesign and iterate) what would fit most of the people in the most economical way. As the number of pilot users increased, more features kept being added (and more bugs were squashed). Finally, we reached a point where HestiaPi covers most people’s needs out of the box and almost everyone else’s needs with just a bit of modification.

Open Source Benefits

HestiaPi is ready for makers, hackers, and developers. Because it’s open source, you can:

  • Control your own data
  • Fix your own hardware with off-the-shelf components
  • Add hardware to fit your needs
  • Run the software you want
    • Patch security fixes first
    • Run a custom distro or software
    • Check open ports, services, and logs
  • Create a custom enclosure to fit your location

Designed for Expandability

HestiaPi’s open nature begs for expansion. So far, we have prototyped wireless sensor modules for sensing CO, CO2, various other gases, dust (PM2.5), smoke, temperature, relative humidity, wind speed and direction, water level, water leak, proximity, PIR motion, and magnetic contacts. We’ve also prototyped controlling and monitoring standard relays, power relays, electric motors, water pumps, sirens, lights, and RGB LED strips.

If HestiaPi is funded, a series of smaller projects are scheduled to deliver the most popular expansions, so you can start building your desired home automation on top of HestiaPi. For less techy people, Sonoff, M5Stack, and other manufacturers already offer solutions that can easily integrate with HestiaPi’s ecosystem.

Easy-to-use Interface Control

HestiaPi Touchscreen

Use HestiaPi’s attractive touchscreen to control the device.

HestiaPi has an easy-to-use, touchscreen interface.

We Support openHAB

HestiaPi is based on the openHAB platform. Use the platform’s accessible web and mobile interface to control HestiaPi.

Most of the cool things HestiaPi can do are because of openHAB. For every HestiaPi purchased during the crowdfunding campaign, we will donate at least €1 to openHAB Foundation e.V.

openHAB UX, from right to left: iOS, Android Light

openHAB UX; Android Dark

Compatible with Google Home and Amazon Alexa

OpenHAB already supports your favorite assistants, so you can easily add HestiaPi to your existing ecosystem.

How HestiaPi Compares

HestiaPi Touch Nestecobee4tado°Honeywell LyricHive
Price (USD)$145$249$249$253$253$228
US HVACYes Yes Yes No No Yes
EU HeatingYes Yes No Yes Yes Yes
Hot WaterYes Yes No No No Yes
Dehumidifier/HumidifierYes No No No No No
User InterfaceTouchscreen & app Touchscreen & app Touchscreen & app Buttons & app Touchscreen & app Buttons & app
ConnectivityWi-Fi, Bluetooth, and Ethernet (w/ additional adapter) Wi-Fi only Wi-Fi only Ethernet only with Internet bridge Wi-Fi only Wi-Fi only
Works with Alexa, Google HomeBoth Both Both Both Both Both
US/EUBoth Both US only EU only EU only EU only
Power TypeMains, AC, C wire support Mains, AC, C wire support C wire only Batteries No C wire support, mains, AC Batteries
BatteriesNone None Required Required None Required
PrivacyOnly you control your data Google controls your data ecobee controls your data tado° controls your data Honeywell controls your data Hive controls your data
Home Automation IntegrationAny API or open platform Check compatibility list No No No Very limited
HackableYes No No No No No
MQTT SupportYes No No No No No
ESP8266 and Sonoff/Tasmota SupportYes/Yes No/No No/No No/No No/No No/No

Support & Documentation

If you have a technical question about the operation of the HestiaPi or any of its applications, please ask the creators your question directly on their forum using the link above.



We design, develop, and manufacture open source, wireless, and IoT solutions in the hospitality and residential sector.


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