# Kachel

**URL:** <https://community.homey.app/t/kachel/29895>\
**Category:** Ideas & Suggestions\
**Created:** [May 15, 2020, 6:17am UTC](https://community.homey.app/t/kachel/29895 "2020-05-15T06:17:09Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Dirk\_Hermse](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/dirk_hermse/32/9234_2.png) [@Dirk\_Hermse](https://community.homey.app/u/Dirk_Hermse)\
**Post date:** [May 15, 2020, 6:17am UTC](https://community.homey.app/t/kachel/29895/1 "2020-05-15T06:17:10Z")

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how do I make a flow heater I have a smart socket and a smart thermostat and an electric heater I want to keep the heater at 20 degrees

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**Author:** ![Frank\_van\_de\_Schuur](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/frank_van_de_schuur/32/35882_2.png) [@Frank\_van\_de\_Schuur](https://community.homey.app/u/Frank_van_de_Schuur)\
**Post date:** [May 16, 2020, 6:07pm UTC](https://community.homey.app/t/kachel/29895/2 "2020-05-16T18:07:37Z")

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Thats quite a generic question Dirk. The function is of course:

- if the smart thermostat says the temperature is **below** 20 degrees the smart socket should be ‘ **On** ’
- If the smart thermostat says the temperature is **above** 20 degrees the smart socket should be ‘ **Off** ’  
You may consider to add a bit of hysteresis around the wanted temperature.

But…I get the feeling that your question is different than just asking for the above functionality

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**Author:** ![FKey](https://sea1.discourse-cdn.com/flex025/user_avatar/community.homey.app/fkey/32/14793_2.png) [@FKey](https://community.homey.app/u/FKey)\
**Post date:** [May 16, 2020, 7:50pm UTC](https://community.homey.app/t/kachel/29895/3 "2020-05-16T19:50:26Z")

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This is how I control my electric heater:  
I have a temp sensor&controller of honeywell evohome called “zolder”. This contoller can set a desired temp and measure the temperature.  
If you only have a meaurement sensor you can make a virtual device to sontrol the temp  
And a switch called “heater”

Measured temp is changed then On  
 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/0/0/00eb655e916b23fbeb3c565803237930a8e32a2e.jpeg)  
Measured temp is changed then Off  
 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/1/c/1ce22a3ccf531c8fec044431950647443f67f030.jpeg)

The temp set on the controller is changed  
 ![image](https://us1.discourse-cdn.com/flex025/uploads/athom/original/3X/9/c/9c98680a79bddf82084e51fb184113d611eb830b.jpeg)